CN111834632A - Soft package lithium iron phosphate power battery and preparation method thereof - Google Patents
Soft package lithium iron phosphate power battery and preparation method thereof Download PDFInfo
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- CN111834632A CN111834632A CN202010712439.2A CN202010712439A CN111834632A CN 111834632 A CN111834632 A CN 111834632A CN 202010712439 A CN202010712439 A CN 202010712439A CN 111834632 A CN111834632 A CN 111834632A
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- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 title claims abstract description 82
- 238000002360 preparation method Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 claims abstract description 84
- 230000008569 process Effects 0.000 claims abstract description 68
- 239000007774 positive electrode material Substances 0.000 claims abstract description 42
- 239000007773 negative electrode material Substances 0.000 claims abstract description 22
- 239000011248 coating agent Substances 0.000 claims description 141
- 238000000576 coating method Methods 0.000 claims description 141
- 239000002002 slurry Substances 0.000 claims description 122
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 80
- 238000003756 stirring Methods 0.000 claims description 60
- 239000006258 conductive agent Substances 0.000 claims description 56
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 54
- 238000007789 sealing Methods 0.000 claims description 41
- 229910052786 argon Inorganic materials 0.000 claims description 40
- 239000000463 material Substances 0.000 claims description 38
- 239000010405 anode material Substances 0.000 claims description 32
- 230000015572 biosynthetic process Effects 0.000 claims description 31
- 238000001816 cooling Methods 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 239000000203 mixture Substances 0.000 claims description 25
- 238000003466 welding Methods 0.000 claims description 25
- 229910002804 graphite Inorganic materials 0.000 claims description 24
- 239000010439 graphite Substances 0.000 claims description 24
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 22
- 238000002347 injection Methods 0.000 claims description 21
- 239000007924 injection Substances 0.000 claims description 21
- 238000005520 cutting process Methods 0.000 claims description 20
- 238000003698 laser cutting Methods 0.000 claims description 20
- 239000007788 liquid Substances 0.000 claims description 20
- 238000007873 sieving Methods 0.000 claims description 20
- 239000007787 solid Substances 0.000 claims description 20
- 238000005096 rolling process Methods 0.000 claims description 19
- 229910052799 carbon Inorganic materials 0.000 claims description 18
- 239000008367 deionised water Substances 0.000 claims description 18
- 229910021641 deionized water Inorganic materials 0.000 claims description 18
- 238000005086 pumping Methods 0.000 claims description 18
- 239000011230 binding agent Substances 0.000 claims description 17
- 239000003792 electrolyte Substances 0.000 claims description 16
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 14
- 238000013461 design Methods 0.000 claims description 14
- 239000002562 thickening agent Substances 0.000 claims description 14
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 13
- -1 polyethylene Polymers 0.000 claims description 13
- 239000002033 PVDF binder Substances 0.000 claims description 12
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 12
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 12
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 12
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 12
- 239000002904 solvent Substances 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000004806 packaging method and process Methods 0.000 claims description 11
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 10
- 239000000853 adhesive Substances 0.000 claims description 10
- 230000001070 adhesive effect Effects 0.000 claims description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 10
- 239000006256 anode slurry Substances 0.000 claims description 10
- 238000005056 compaction Methods 0.000 claims description 10
- 239000011889 copper foil Substances 0.000 claims description 10
- 238000007872 degassing Methods 0.000 claims description 10
- 238000007493 shaping process Methods 0.000 claims description 10
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 9
- 239000002041 carbon nanotube Substances 0.000 claims description 9
- 229910021383 artificial graphite Inorganic materials 0.000 claims description 7
- 238000005304 joining Methods 0.000 claims description 6
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims description 5
- 239000002931 mesocarbon microbead Substances 0.000 claims description 5
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 4
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 4
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims description 4
- 229910021382 natural graphite Inorganic materials 0.000 claims description 4
- 229920000573 polyethylene Polymers 0.000 claims description 4
- 239000003575 carbonaceous material Substances 0.000 claims description 3
- 229910021385 hard carbon Inorganic materials 0.000 claims description 3
- 239000002985 plastic film Substances 0.000 claims description 3
- 229920006255 plastic film Polymers 0.000 claims description 3
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 claims description 3
- 239000000084 colloidal system Substances 0.000 claims description 2
- 238000003475 lamination Methods 0.000 claims description 2
- 238000005524 ceramic coating Methods 0.000 claims 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 14
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 14
- 239000010410 layer Substances 0.000 description 43
- 239000010406 cathode material Substances 0.000 description 19
- 238000007599 discharging Methods 0.000 description 11
- 239000006182 cathode active material Substances 0.000 description 8
- 239000006257 cathode slurry Substances 0.000 description 8
- 239000011888 foil Substances 0.000 description 8
- 239000006245 Carbon black Super-P Substances 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 2
- 238000001467 acupuncture Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 2
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- HFCVPDYCRZVZDF-UHFFFAOYSA-N [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O Chemical compound [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O HFCVPDYCRZVZDF-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- CDRXHPHCGLPMFV-UHFFFAOYSA-N carbonic acid pent-2-ene Chemical compound OC(O)=O.CCC=CC CDRXHPHCGLPMFV-UHFFFAOYSA-N 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- CYEDOLFRAIXARV-UHFFFAOYSA-N ethyl propyl carbonate Chemical compound CCCOC(=O)OCC CYEDOLFRAIXARV-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 1
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 238000009783 overcharge test Methods 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1393—Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1397—Processes of manufacture of electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Inorganic Chemistry (AREA)
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Abstract
The invention discloses a soft-package lithium iron phosphate power battery and a preparation method thereof. The invention belongs to the technical field of batteries and preparation methods thereof, and particularly provides a soft-package lithium iron phosphate power battery and a preparation method thereof, wherein the components, the proportion and other process parameters of a positive electrode material and a negative electrode material are optimally designed, so that the safety performance is greatly improved while the battery has high capacity, and the use requirements of the existing lithium ion battery can be met; meanwhile, on the basis of a soft package ternary power battery, the preparation parameters of the lithium iron phosphate power battery are changed, and the lithium iron phosphate power battery prepared by the method has excellent electrical property and safety performance and can meet the requirements of people on the large capacity and safety of various electric cars and the like.
Description
Technical Field
The invention belongs to the technical field of batteries and preparation methods thereof, and particularly relates to a soft package lithium iron phosphate power battery and a preparation method thereof.
Background
Lithium ion batteries have been widely used in various fields as green and environmentally friendly energy sources, and are classified into lithium cobalt oxide batteries, lithium manganate batteries, ternary material batteries, lithium iron phosphate batteries, and the like, by differentiating positive electrode materials. The lithium iron phosphate battery is superior to other batteries in terms of electrochemical performance including reversible capacity, stability, safety, cyclicity, large-current discharge capacity and price of raw materials. Particularly, the capacity retention rate of the energy type lithium iron phosphate battery in 1C circulation for 2000 times can reach more than 80 percent and is far higher than that of a cobalt acid lithium battery, a ternary material battery and a lithium manganate battery. The lithium iron phosphate material battery has the characteristics of stable electrochemistry, good safety, good cycle performance and the like, has obvious advantages in the aspects of improving the safety of new energy automobiles and relieving the safety worry of users, and also has the advantages of long cycle life, adaptability to all-weather temperature and the like, so the lithium iron phosphate material battery is gradually favored by automobile and passenger car manufacturers and users.
With the improvement of the use demand of people, the capacity requirements of electric automobiles, hybrid electric automobiles, low-speed automobiles and the like on lithium ion batteries are higher and higher, so that new requirements are provided for the safety performance of the lithium ion batteries, meanwhile, the lithium ion batteries are required to have the performances of high specific energy, high specific power, quick charge and deep discharge, and particularly on new energy automobiles, the problem of high-power required by the new energy automobiles during high-speed running, climbing, automobile starting and quick charge is solved. However, the existing lithium iron phosphate battery is very easy to generate short circuit explosion phenomenon in the large current charging and discharging process and in the needling test, and the safety performance of the existing lithium iron phosphate battery is improved by adopting a method for reducing the battery capacity in the prior art, so that the use requirements of people on electric vehicles, hybrid electric vehicles, low-speed vehicles and the like cannot be met. For example, when the battery reaches a certain temperature under an overcharge condition, the electrolyte may undergo decomposition and oxidation reactions to generate a large amount of heat, and if the heat is not suppressed in time, the heat accumulation may cause a further increase in temperature. When the temperature reaches a certain level, the battery explodes and fires. At present, overcharge tests of most batteries show that the safety temperature of the batteries is about 110 ℃ in the overcharge process. When the temperature of the battery reaches or exceeds 110 ℃, the electrolyte and the cathode material in the battery can react violently, thermal runaway occurs, the temperature rises sharply, and finally fire explosion is caused. Therefore, how to improve the safety performance of the lithium ion battery is important on the basis of ensuring that the lithium ion battery has large capacity, and the method is also a technical problem which needs to be solved urgently in the production of the lithium ion battery for the existing new energy automobile.
Chinese patent 710366427.7 discloses a soft-package ternary power battery, a preparation method thereof and a battery anode plate, and discloses a soft-package ternary power battery capable of remarkably improving the safety performance of a lithium ion battery on the basis of ensuring large capacity. Compared with a lithium iron phosphate power battery, the conventional ternary power battery has slightly poor cycle life and poor service life under a high-temperature condition, so that the invention provides the soft-package lithium iron phosphate power battery which has long cycle life, long service life under the high-temperature condition and high capacity and high safety and the preparation method thereof on the basis of the ternary power battery with high capacity and high safety.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a soft-package lithium iron phosphate power battery and a preparation method thereof, wherein the soft-package lithium iron phosphate power battery ensures the safety performance of a lithium ion battery on the basis of ensuring the large capacity of the lithium ion battery.
The technical scheme adopted by the invention is as follows: the invention relates to a soft package lithium iron phosphate power battery, which comprises a positive pole piece, a negative pole piece, a diaphragm, electrolyte and a battery shell, wherein the positive pole piece, the negative pole piece and the diaphragm form a diaphragm/negative pole/diaphragm/positive pole laminated battery core, the positive pole piece comprises a positive pole current collector, the positive pole current collector comprises a first coating area, a second coating area and a connecting area, the first coating area is connected with the second coating area through the connecting area, the length of the connecting area is smaller than that of the first coating area and the second coating area, positive pole material layers are arranged on the front and back surfaces of the first coating area and the second coating area, the negative pole piece comprises a negative pole current collector and a negative pole material layer, the negative pole material layer is coated on the front and back surfaces of the negative pole current collector, the diaphragm is coated with polyethylene and ceramic, the diaphragm has the thickness of 12-30 mu m, the electrolyte is one or a mixture of more of lithium hexafluorophosphate, methyl ethyl carbonate, ethylene carbonate, dimethyl carbonate, diethyl carbonate and propylene carbonate, and the battery shell is packaged by an aluminum plastic film.
Further, the positive electrode material layer is composed of a lithium iron phosphate material, polyvinylidene fluoride and a conductive agent, and the conductive agent is one or more of conductive carbon black, superconducting carbon, conductive graphite, crystalline flake graphite and carbon nano tubes.
Further, the negative electrode material layer is composed of a negative electrode active material, a conductive agent, sodium carboxymethylcellulose and styrene butadiene rubber, the negative electrode active material is one or more of artificial graphite, natural graphite, mesocarbon microbeads and hard carbon materials, and the conductive agent is one or more of conductive carbon black, superconducting carbon and conductive graphite.
Furthermore, the negative current collector adopts copper foil, the thickness of the negative current collector is 8-15 μm, and the thickness of the negative material layer on the surface of the negative current collector is 120-130 μm.
Further, the positive electrode material layer comprises the following components in percentage by mass: 91-96% of lithium iron phosphate, 1-4% of superconducting carbon, 1-3% of conductive graphite, 0-2% of carbon nano tube and 1.5-5% of polyvinylidene fluoride.
Further, the negative electrode material layer is composed of the following components in percentage by mass: 91-95% of negative active material, 0-2% of conductive carbon black, 0-2% of conductive graphite, 2-4% of styrene butadiene rubber and 1-2% of sodium carboxymethylcellulose.
Furthermore, the positive pole piece is provided with a positive pole lug.
Furthermore, a negative pole tab is arranged on the negative pole piece.
The invention relates to a preparation method of a soft package lithium iron phosphate power battery, which specifically comprises the following steps:
(1) preparation of the slurry
1) Preparing positive electrode material slurry: preparing anode slurry by taking N-methyl pyrrolidone as a solvent, adding a binder into the N-methyl pyrrolidone, stirring for 2-3 hours in vacuum under the condition of circulating water cooling, adding a uniformly mixed mixture of lithium iron phosphate and a conductive agent, adding the mixture, stirring for 3-6 hours, and sieving the obtained slurry to obtain anode material slurry;
2) preparing anode material slurry: adding a thickening agent into deionized water, stirring for 1-3 hours, then adding a conductive agent, continuously stirring for 2-4 hours, passing the slurry through a colloid mill to completely disperse the conductive agent, then adding a negative electrode active material, stirring for 2-5 hours, then adding an adhesive, stirring for 2-3 hours, and sieving the obtained slurry to obtain negative electrode material slurry;
(2) coating of positive and negative electrodes
Uniformly coating positive electrode material slurry on the front and back surfaces of a first coating area and a second coating area of a positive electrode current collector, reserving a positive electrode lug, and enabling the coating surface density of the positive electrode to be 22-23 mg/cm2Simultaneously, Al is uniformly coated on the front and back surfaces of the connecting area2O3Coating, and then baking in an oven at 95-120 ℃; uniformly coating the positive and negative surfaces of the negative current collector with negative material slurry, reserving a negative electrode lug, and enabling the density of the coated surface of the negative electrode to be 10-11 mg/cm2Then, placing the coated negative electrode in an oven at 70-110 ℃ for baking;
(3) pole piece rolling and cutting
Carrying out rolling treatment on the coated positive pole piece and negative pole piece, wherein the positive pole compaction density is 2.2-2.3 g/cm3The compacted density of the negative electrode is 1.4-1.6 g/cm3Then, carrying out laser cutting on the rolled positive and negative pole pieces according to the manufacturing specification of the battery pole pieces, and accurately reserving the positive pole piece connecting area and the positive and negative pole lug positions during laser cutting;
(4) pole piece baking method
Baking the cut pole piece in a vacuum state, baking a positive pole piece at the temperature of 100-130 ℃ for 10-12 hours, baking a negative pole piece at the temperature of 80-100 ℃ for 10-12 hours, continuously exhausting argon for 3-5 times every 2-4 hours in the baking process, continuously exhausting argon for 3-5 times after baking is finished, cooling the pole piece to be below 45 ℃ in the vacuum state, and taking out the pole piece for subsequent processes;
(5) preparation of battery core
Superposing the baked positive pole piece, negative pole piece and diaphragm to form a diaphragm/negative pole/diaphragm/positive pole laminated structure battery cell;
(6) welding positive and negative pole lugs, embedding and packaging battery cell
Respectively welding a positive electrode lug and a negative electrode lug on reserved current collectors of positive and negative electrode plates according to the design requirements of the battery, then placing a battery cell into a punched battery shell, and thermally sealing the top and one side edge of the battery by using a sealing machine under the conditions that the temperature is 150-250 ℃, the pressure is 0.2-0.5 Mpa and the time is 5-10 seconds;
(7) battery core baking and battery liquid injection
Baking the battery cell for 20-24 hours at 80-120 ℃ in a vacuum state, continuously pumping argon for 2-4 times every 4-6 hours in the baking process, continuously pumping argon for 3-5 times after baking is finished, cooling the pole piece to be below 45 ℃ in the vacuum state, taking out the battery cell for a liquid injection process, thermally sealing the other side edge of the battery, and then placing the battery for 24 hours;
(8) formation and capacity grading of battery
The time-limited formation is adopted, and the formation process comprises the following steps: charging at 0.05C for 5 hours, +0.1C for 4 hours, +0.2C for 2.5 hours, then degassing, heat-sealing, cutting edges and shaping the battery; the battery capacity grading process comprises the following steps: the battery is charged to 3.65V at a constant current of 1C, then to 3.65V at a constant current and a constant voltage, the cut-off current is 0.05C, and then to 2.0V at 1C, and the discharged capacity of the battery is the battery capacity.
Furthermore, the welding of the positive electrode lug and the welding of the negative electrode lug both adopt ultrasonic welding.
Furthermore, the solid content of the cathode material slurry is 38-50%, the solid content of the anode material slurry is 60-75%, the ratio of the surface density of the anode coating to the surface density of the cathode coating is 1 (0.5-0.7), and before the slurry is prepared, the lithium iron phosphate is baked for 12-24 hours at 120-150 ℃, and the conductive agent is baked for 4-6 hours at 120-150 ℃.
The invention with the structure has the following beneficial effects: according to the soft-package lithium iron phosphate power battery and the preparation method thereof, the components, the proportion and other process parameters of the anode material and the cathode material are optimally designed, so that the excellent charging and discharging performance and the excellent service performance of the battery can be effectively guaranteed, the battery has larger capacity, the safety performance is greatly improved, the service requirement of the existing lithium ion battery can be met, and the problem that the safety service performance of the existing lithium iron phosphate power battery is guaranteed by sacrificing the battery capacity is solved; meanwhile, on the basis of a soft package ternary power battery, the preparation parameters of the lithium iron phosphate power battery are changed, and the lithium iron phosphate power battery prepared by the method has excellent electrical property and safety performance and can meet the requirements of people on the large capacity and safety of various electric cars and the like.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The positive electrode material layer comprises 93-96% of positive electrode active substance, 1.5-5% of binder and 2-8% of conductive agent by mass percent. The conductive agent comprises the following components in percentage by mass: 1-4% of superconducting carbon, 1-3% of conductive graphite and 0-2% of carbon nano tube. The negative electrode material layer consists of a negative electrode active material, a conductive agent, a thickening agent and a binder, wherein the negative electrode active material accounts for 91-95 wt%, the conductive agent accounts for 0-4 wt%, the thickening agent accounts for 1-2 wt%, and the binder accounts for 2-4 wt%, and more preferably, the conductive agent consists of the following components in percentage by mass: 0-2% of conductive carbon black and 0-2% of conductive graphite. The electrolyte is one or a mixture of several of lithium hexafluorophosphate, ethyl methyl carbonate, ethylene carbonate, dimethyl carbonate, diethyl carbonate and propylene carbonate, and only some examples are listed below for the purpose of space limitation, and the actual protection scope is not limited to the following specific examples.
Example 1
The soft-package lithium iron phosphate power battery (3.2V/40Ah) comprises a positive pole piece, a negative pole piece, a diaphragm, electrolyte and a battery shell, wherein the positive pole piece, the negative pole piece and the diaphragm form a diaphragm/negative pole/diaphragm/positive lamination type battery core. The diaphragm is coated by polyethylene and ceramic, the thickness of the diaphragm is 15 micrometers, the electrolyte is lithium hexafluorophosphate, and the battery shell is formed by packaging an aluminum plastic film.
The positive pole piece comprises a positive pole current collector, the positive pole current collector adopts an aluminum foil with the thickness of 12 mu m, the positive pole current collector comprises a first coating area, a second coating area and a connecting area, the first coating area and the second coating area are connected through the connecting area, and the first coating area and the second coating area are symmetrical about the connecting area. In this embodiment, positive electrode material layers are disposed on the front and back surfaces of the first coating region and the second coating region, and Al is disposed on the front and back surfaces of the connection region2O3Coating layer, and positive electrode material layer and Al2O3The thickness of the coating was the same and was 110. mu.m. Of the above-mentioned connection regionThe length of the connecting area is smaller than that of the first coating area and the second coating area, namely, a concave groove structure is formed between the two end faces of the connecting area and the first coating area and the second coating area. Specifically, in this embodiment, the length of the connecting region is 1/10 the length of the first and second coating regions, and the width is 1/68 the width of the first and second coating regions, and the thickness is the same as the thickness of the first and second coating regions.
The safety performance to current lithium iron phosphate power battery is relatively poor, guarantee its safety performance through sacrificing battery capacity usually, thereby be difficult to satisfy green energy automobile's operation requirement not enough, this embodiment carries out optimal design through the structure to battery positive pole piece, separate positive pole piece for three region through the joining region promptly, and the both ends face and the first zone of coating of joining region, form the concave groove structure between the second zone of coating, thereby under the prerequisite of guaranteeing the large capacity, lithium ion battery's safety performance has been showing and has been improved. Through the structural design, the lithium ion battery can carry out normal charging and discharging processes under normal conditions, when the battery bears external acupuncture, short circuit, extrusion, impact and the like, the short circuit occurs inside the battery cell, and the short circuit instantaneous current is large and reaches a certain value (reaches 12A/mm)2In the meantime), the positive pole piece connecting area is broken into two parts, so that the whole 1/2 of the battery is disabled, the safety performance of the battery is greatly improved, and the normal use of the battery is not influenced.
Meanwhile, a buffer space can be formed through the structural design of the connecting area, so that the stress generated by the volume expansion of the pole piece material is effectively buffered under the condition that the battery has higher energy density, and the electrical property of the battery is improved. The arrangement of the connecting area can also form a heat dissipation space, so that the heat dissipation capacity of the battery is greatly improved, the occurrence of the short circuit phenomenon in the battery is favorably prevented, and the electrical property of the battery is further improved. In this embodiment, Al is provided on both the front and back surfaces of the connecting region2O3The coating can further ensure the safety use performance of the battery and prevent the fire and explosion risks caused by short circuit.
In addition, the structural size of the connection region is important to improve the safety of the battery and to ensure its normal use. When the length or the width of the connection area is too large, the battery is difficult to break from the connection area when the battery bears external acupuncture, short circuit, extrusion, impact and the like to cause the internal short circuit of the battery core, so that the safety performance of the battery cannot be effectively improved; when the length or width of the connection region is too small, the battery may be broken by a small current, thereby affecting its normal use. The inventor carries out the optimal design to the size of joining region through a large amount of experiments to can guarantee the normal performance of battery, can improve its security performance again, prevent to explode when the short circuit takes place in the battery.
The negative pole piece comprises a negative pole current collector and negative pole material layers coated on the front side and the back side of the negative pole current collector, the negative pole current collector adopts copper foils with the thickness of 8 mu m, the thickness of the negative pole material layer on the surface of the negative pole current collector is 120 mu m, a positive pole lug is arranged on the positive pole current collector corresponding to the first coating area or the second coating area, and a negative pole lug is arranged on the negative pole piece.
In this embodiment, the positive electrode material layer is composed of the following components in percentage by mass: 94% of lithium iron phosphate, 1.6% of conductive agent superconducting carbon (Super-P), 1.0% of conductive graphite, 0.4% of carbon nano tube and 3.0% of binder polyvinylidene fluoride. The negative electrode material layer comprises the following components in percentage by mass: 94% of artificial graphite, 2.5% of conductive agent superconducting carbon (Super-P), 2.0% of binder Styrene Butadiene Rubber (SBR) and 1.5% of thickener sodium carboxymethylcellulose (CMC).
The preparation method of the soft-package lithium iron phosphate power battery comprises the following steps:
(1) preparation of the slurry
1) Preparing positive electrode material slurry: preparing anode slurry by taking N-methyl pyrrolidone (NMP) as a solvent, adding a binder into the N-methyl pyrrolidone, carrying out vacuum stirring for 2 hours under the condition of circulating water cooling, then adding a uniformly mixed mixture of lithium iron phosphate and a conductive agent, adding the mixture, stirring for 3 hours, and sieving the obtained slurry for 2 times to obtain the anode material slurry, wherein the solid content of the anode material slurry is 68%. Before the slurry is prepared, the lithium iron phosphate needs to be baked for 24 hours at 120 ℃, and the conductive agent needs to be baked for 6 hours at 135 ℃.
2) Preparing anode material slurry: preparing cathode slurry by taking deionized water as a medium, adding a thickening agent into the deionized water, stirring for 2.5 hours, then adding a conductive agent, stirring for 3.5 hours to completely disperse the conductive agent, then adding a cathode active material, stirring for 4.5 hours, then adding an adhesive, stirring for 3 hours, sieving the obtained slurry for 2 times to remove larger particles in the slurry to obtain cathode material slurry, wherein the solid content of the cathode material slurry is 43%;
(2) coating of positive and negative electrodes
Uniformly coating the positive electrode material slurry on the front and back surfaces of a first coating area and a second coating area of a positive electrode current collector, reserving a positive electrode lug, and adopting roll gap type coating to coat, wherein the density of the coated surface of the positive electrode is 21mg/cm2Simultaneously, Al is uniformly coated on the front and back surfaces of the connecting area2O3Coating, and then baking in an oven at 115 ℃; uniformly coating the anode material slurry on the front and back surfaces of an anode current collector, reserving anode lugs, and ensuring that the density of the coated surface of the anode is 11mg/cm2Then, placing the coated negative electrode in an oven at 95 ℃ for baking; the coating surface density is determined by trial coating, and the coating surface density is controlled by taking care that the phenomena of scratches and foil leakage cannot occur and the coating uniformity in the transverse direction and the longitudinal direction is controlled.
(3) Pole piece rolling and cutting
Rolling the coated positive pole piece and negative pole piece, wherein the positive pole compaction density is 2.3g/cm3The compacted density of the negative electrode is 1.45g/cm3When tabletting, the transverse and longitudinal consistency of the pole piece is noticed; and then carrying out laser cutting on the rolled positive and negative pole pieces according to the manufacturing specification of the battery pole pieces, accurately reserving the positive pole piece connecting area and the positive and negative pole lug positions during laser cutting, and simultaneously avoiding the phenomenon of pole piece burrs as much as possible so as to prevent the battery short circuit caused by the fact that the burrs puncture the diaphragm.
(4) Pole piece baking method
Baking the cut pole piece in a vacuum state, baking the positive pole piece for 12 hours at the temperature of 123 ℃, baking the negative pole piece for 12 hours at the temperature of 95 ℃, and continuously exhausting argon for 3 times every 4 hours in the baking process, so that the solvent and the moisture baked from the pole piece in an oven can be removed, the drying in the oven can be kept, and the pole piece is baked more fully; after baking, continuously exhausting argon for 3 times, cooling the pole piece to below 45 ℃ in a vacuum state, and taking out the pole piece for subsequent processes.
(5) Preparation of battery core
Superposing the baked positive pole piece, negative pole piece and diaphragm to form a diaphragm/negative pole/diaphragm/positive pole laminated structure battery cell;
(6) welding positive and negative pole lugs, embedding and packaging battery cell
Welding a positive electrode lug and a negative electrode lug on reserved current collectors of a positive electrode plate and a negative electrode plate respectively by ultrasonic welding according to the design requirements of the battery, then placing a battery cell into a punched battery shell, and thermally sealing the top and one side edge of the battery by a sealing machine under the conditions of the temperature of 150 ℃, the pressure of 0.2Mpa and the time of 5 seconds.
(7) Battery core baking and battery liquid injection
Baking the battery core for 24 hours at 120 ℃ in a vacuum state, continuously exhausting argon gas for 3 times every 6 hours in the baking process so as to remove solvent and moisture baked from the pole piece in the oven, keeping the oven dry so as to ensure that the battery core is baked more fully, continuously exhausting argon gas for 3 times after baking is finished, cooling the pole piece to below 45 ℃ in the vacuum state, taking out the battery core for liquid injection, wherein the injection amount of electrolyte is 175g, then thermally sealing the other side of the battery, and reserving a side air bag during thermal sealing so that gas generated in the formation process of the battery can stay in the air bag, the battery cannot bulge and cause leakage of the battery, and then standing the battery for 24 hours.
(8) Formation and capacity grading of battery
The time-limited formation is adopted, and the formation process comprises the following steps: charging at 0.05C for 5 hours, +0.1C for 4 hours, +0.2C for 2.5 hours, then degassing, heat-sealing, cutting edges and shaping the battery; the battery capacity grading process comprises the following steps: the battery is charged to 3.65V at a constant current of 1C, then to 3.65V at a constant current and a constant voltage, the cut-off current is 0.05C, and then to 2.0V at 1C, and the discharged capacity of the battery is the battery capacity.
Example 2
The soft-package lithium iron phosphate power battery (3.2V/30Ah) of the embodiment has a structure basically the same as that of embodiment 1, and is different from that of the embodiment 1 in that: the positive current collector adopts an aluminum foil with the thickness of 16 mu m, and the diaphragm thickness is 15 mu m. The length of the connecting zone is 1/8 the length of the first and second coated zones and the width is 1/65 the width of the first and second coated zones.
In this embodiment, the thickness of the positive electrode material layer is 120 μm, and the positive electrode material layer is composed of the following components by mass percent: 92% of lithium iron phosphate, 2% of conductive agent superconducting carbon (Super-P), 1% of conductive graphite, 1.5% of carbon nano tube and 3.5% of binder polyvinylidene fluoride. The negative current collector adopts a copper foil with the thickness of 9 mu m, the thickness of a negative material layer on the surface of the negative current collector is 130 mu m, and the negative material layer comprises the following components in percentage by mass: 95% of artificial graphite, 1% of conductive agent superconducting carbon (Super-P), 4.0% of binder Styrene Butadiene Rubber (SBR) and 1% of thickener sodium carboxymethylcellulose (CMC).
The process of the preparation method of the soft-package lithium iron phosphate power battery in this embodiment is the same as that of embodiment 1.
Example 3
The soft-package lithium iron phosphate power battery of the embodiment has a structure basically the same as that of embodiment 1, and the difference is mainly that: in this embodiment, the thickness of the positive electrode material layer is 113 μm, and the positive electrode material layer is composed of the following components by mass percent: 91% of lithium iron phosphate, 4% of superconducting carbon, 1.5% of conductive graphite, 2% of carbon nano tube and 1.5% of polyvinylidene fluoride. The negative electrode current collector adopts a copper foil with the thickness of 8 mu m, the thickness of the negative electrode material layer is 124 mu m, and the negative electrode material layer comprises the following components in percentage by mass: 91% of hard carbon material, 2% of conductive carbon black, 2% of conductive graphite, 4% of styrene butadiene rubber and 1% of sodium carboxymethylcellulose.
The preparation method of the soft-package lithium iron phosphate power battery comprises the following steps:
(1) preparation of the slurry
1) Preparing positive electrode material slurry: preparing anode slurry by taking N-methyl pyrrolidone (NMP) as a solvent, adding a binder into the N-methyl pyrrolidone, carrying out vacuum stirring for 2 hours under the condition of circulating water cooling, then adding a uniformly mixed mixture of lithium iron phosphate and a conductive agent, adding the mixture, stirring for 3 hours, and sieving the obtained slurry for 2 times to obtain the anode material slurry, wherein the solid content of the anode material slurry is 60%. Before the slurry is prepared, the lithium iron phosphate needs to be baked for 24 hours at 120 ℃, and the conductive agent needs to be baked for 6 hours at 135 ℃.
2) Preparing anode material slurry: preparing cathode slurry by taking deionized water as a medium, adding a thickening agent into the deionized water, stirring for 2.5 hours, then adding a conductive agent, stirring for 3.5 hours to completely disperse the conductive agent, then adding a cathode active material, stirring for 4.5 hours, then adding an adhesive, stirring for 3 hours, and sieving the obtained slurry for 3 times to obtain cathode material slurry, wherein the solid content of the cathode material slurry is 38%;
(2) coating of positive and negative electrodes
Uniformly coating the positive electrode material slurry on the positive and negative surfaces of a first coating area and a second coating area of a positive electrode current collector, reserving a positive electrode lug, and ensuring that the coating surface density of the positive electrode is 22mg/cm2Simultaneously, Al is uniformly coated on the front and back surfaces of the connecting area2O3Coating, and then baking in an oven at 95 ℃; evenly coating the positive and negative surfaces of the negative current collector with negative material slurry, reserving a negative electrode lug, and enabling the density of the coated surface of the negative electrode to be 11.5mg/cm2Then, placing the coated negative electrode in an oven at 70 ℃ for baking;
(3) pole piece rolling and cutting
Rolling the coated positive pole piece and negative pole piece, wherein the positive pole compaction density is 2.3g/cm3The compacted density of the negative electrode is 1.4g/cm3Then, carrying out laser cutting on the rolled positive and negative pole pieces according to the manufacturing specification of the battery pole pieces, and accurately reserving the positive pole piece connecting area and the positive and negative pole lug positions during laser cutting;
(4) pole piece baking method
Baking the cut pole piece in a vacuum state, baking a positive pole piece at the temperature of 100 ℃ for 12 hours, baking a negative pole piece at the temperature of 95 ℃ for 12 hours, continuously exhausting argon for 5 times every 2 hours in the baking process, continuously exhausting argon for 3 times after baking is finished, cooling the pole piece to be below 45 ℃ in the vacuum state, and taking out the pole piece to perform subsequent processes;
(5) preparation of battery core
Superposing the baked positive pole piece, negative pole piece and diaphragm to form a diaphragm/negative pole/diaphragm/positive pole laminated structure battery cell;
(6) welding positive and negative pole lugs, embedding and packaging battery cell
Respectively welding a positive electrode lug and a negative electrode lug on reserved current collectors of a positive electrode plate and a negative electrode plate by ultrasonic welding according to the design requirements of the battery, then placing a battery cell into a punched battery shell, and thermally sealing the top and one side edge of the battery by a sealing machine under the conditions of the temperature of 150 ℃, the pressure of 0.2Mpa and the time of 5 seconds;
(7) battery core baking and battery liquid injection
Baking the battery cell for 24 hours at 120 ℃ in a vacuum state, continuously pumping argon for 2 times every 4 hours in the baking process, continuously pumping argon for 3 times after baking is finished, cooling the pole piece to be below 45 ℃ in the vacuum state, taking out the battery cell for a liquid injection process, thermally sealing the other side edge of the battery, and then placing the battery for 24 hours;
(8) formation and capacity grading of battery
The time-limited formation is adopted, and the formation process comprises the following steps: charging at 0.05C for 5 hours, +0.1C for 4 hours, +0.2C for 2.5 hours, then degassing, heat-sealing, cutting edges and shaping the battery; the battery capacity grading process comprises the following steps: the battery is charged to 3.65V at a constant current of 1C, then to 3.65V at a constant current and a constant voltage, the cut-off current is 0.05C, and then to 2.0V at 1C, and the discharged capacity of the battery is the battery capacity.
Example 4
The soft-package lithium iron phosphate power battery of the embodiment has a structure basically the same as that of embodiment 3, and the difference is mainly that: the positive current collector adopts an aluminum foil with the thickness of 25 mu m, the length of the connecting area is 1/8 of the lengths of the first coating area and the second coating area, and the width of the connecting area is 1/65 of the widths of the first coating area and the second coating area; the diaphragm is a polypropylene and ceramic diaphragm, the thickness of the diaphragm is 30 mu m, and the electrolyte is ethyl methyl carbonate.
In this embodiment, the positive electrode material layer is composed of the following components in percentage by mass: 93% of lithium iron phosphate, 2% of superconducting carbon, 1% of conductive graphite, 1% of carbon nano tube and 3% of polyvinylidene fluoride, and the thickness of the anode material layer is 115 mu m. The negative current collector adopts a copper foil with the thickness of 15 mu m, the thickness of a negative material layer on the surface of the negative current collector is 128 mu m, and the negative material layer consists of the following components in percentage by mass: 93% of natural graphite, 1% of conductive carbon black, 1.5% of conductive graphite, 3% of styrene butadiene rubber and 1.5% of sodium carboxymethylcellulose.
The preparation method of the soft-package lithium iron phosphate power battery comprises the following steps:
(1) preparation of the slurry
1) Preparing positive electrode material slurry: preparing anode slurry by taking N-methyl pyrrolidone as a solvent, adding a binder into the N-methyl pyrrolidone, carrying out vacuum stirring for 3 hours under the condition of circulating water cooling, then adding a uniformly mixed mixture of nickel cobalt lithium manganate and a conductive agent, adding the mixture, stirring for 3.5 hours, and sieving the obtained slurry for 1 time to obtain the anode material slurry, wherein the solid content of the anode material slurry is 65%. Before the slurry is prepared, the lithium iron phosphate needs to be baked for 18 hours at 150 ℃, and the conductive agent needs to be baked for 4 hours at 150 ℃.
2) Preparing anode material slurry: preparing cathode slurry by taking deionized water as a medium, adding a thickening agent into the deionized water, stirring for 3 hours, then adding a conductive agent, stirring for 3 hours to completely disperse the conductive agent, then adding a cathode active material, stirring for 2 hours, then adding an adhesive, stirring for 2.5 hours, and sieving the obtained slurry for 2 times to obtain cathode material slurry, wherein the solid content of the cathode material slurry is 40%;
(2) coating of positive and negative electrodes
Uniformly coating the positive electrode material slurry on the positive and negative sides of the first coating area and the second coating area of the positive electrode current collectorTwo sides of the anode are reserved, and the anode ear position is reserved, and the coating surface density of the anode is 24mg/cm2Simultaneously, Al is uniformly coated on the front and back surfaces of the connecting area2O3Coating, and then baking in an oven at 100 ℃; evenly coating the positive and negative surfaces of the negative current collector with negative material slurry, reserving a negative electrode lug, and enabling the density of the coated surface of the negative electrode to be 13mg/cm2Then, placing the coated negative electrode in an oven at 110 ℃ for baking;
(3) pole piece rolling and cutting
Rolling the coated positive pole piece and negative pole piece, wherein the compaction density of the positive pole is 2.4g/cm3The compacted density of the negative electrode is 1.6g/cm3Then, carrying out laser cutting on the rolled positive and negative pole pieces according to the manufacturing specification of the battery pole pieces, and accurately reserving the positive pole piece connecting area and the positive and negative pole lug positions during laser cutting;
(4) pole piece baking method
Baking the cut pole piece in a vacuum state, baking the positive pole piece at the temperature of 115 ℃ for 11 hours, baking the negative pole piece at the temperature of 100 ℃ for 10 hours, continuously exhausting argon for 3 times every 3 hours in the baking process, continuously exhausting argon for 5 times after baking is finished, cooling the pole piece to be below 45 ℃ in the vacuum state, and taking out the pole piece to perform subsequent processes;
(5) preparation of battery core
Superposing the baked positive pole piece, negative pole piece and diaphragm to form a diaphragm/negative pole/diaphragm/positive pole laminated structure battery cell;
(6) welding positive and negative pole lugs, embedding and packaging battery cell
Respectively welding a positive electrode lug and a negative electrode lug on reserved current collectors of positive and negative electrode plates according to the design requirements of the battery, then placing a battery cell into a punched battery shell, and thermally sealing the top and one side edge of the battery by using a sealing machine under the conditions of 175 ℃, 0.5Mpa of pressure and 10 seconds of time;
(7) battery core baking and battery liquid injection
Baking the battery cell for 22 hours at 95 ℃ in a vacuum state, continuously pumping and discharging argon for 4 times every 6 hours in the baking process, continuously pumping and discharging the argon for 4 times after baking is finished, cooling the pole piece to be below 45 ℃ in the vacuum state, taking out the battery cell for a liquid injection process, thermally sealing the other side edge of the battery, and then placing the battery for 24 hours;
(8) formation and capacity grading of battery
The time-limited formation is adopted, and the formation process comprises the following steps: charging at 0.05C for 5 hours, +0.1C for 4 hours, +0.2C for 2.5 hours, then degassing, heat-sealing, cutting edges and shaping the battery; the battery capacity grading process comprises the following steps: the battery is charged to 3.65V at a constant current of 1C, then to 3.65V at a constant current and a constant voltage, the cut-off current is 0.05C, and then to 2.0V at 1C, and the discharged capacity of the battery is the battery capacity.
Example 5
The soft-package lithium iron phosphate power battery of the embodiment has a structure basically the same as that of embodiment 3, and the difference is mainly that: the positive current collector adopts an aluminum foil with the thickness of 20 mu m, the diaphragm adopts a polypropylene + polyethylene + polypropylene three-layer film, the thickness of the diaphragm is 22 mu m, the electrolyte adopts ethylene carbonate, the length of the connecting area is 1/9 of the length of the first coating area and the second coating area, and the width of the connecting area is 1/67 of the width of the first coating area and the second coating area.
In this embodiment, the thickness of the positive electrode material layer is 120 μm, and the positive electrode material layer is composed of the following components in percentage by mass: 96% of lithium iron phosphate, 1% of superconducting carbon, 1.5% of conductive graphite and 1.5% of polyvinylidene fluoride. The negative current collector adopts a copper foil with the thickness of 11 mu m, the thickness of a negative material layer on the surface of the negative current collector is 130 mu m, and the negative material layer consists of the following components in percentage by mass: 95% of (artificial graphite + mesocarbon microbeads), 1% of conductive graphite, 2% of styrene butadiene rubber and 2% of sodium carboxymethylcellulose.
The preparation method of the soft-package ternary power battery comprises the following steps:
(1) preparation of the slurry
1) Preparing positive electrode material slurry: preparing anode slurry by taking N-methyl pyrrolidone as a solvent, adding a binder into the N-methyl pyrrolidone, carrying out vacuum stirring for 2.5 hours under the condition of circulating water cooling, then adding a uniformly mixed mixture of lithium iron phosphate and a conductive agent, adding the mixture, stirring for 4 hours, and sieving the obtained slurry for 2 times to obtain the anode material slurry, wherein the solid content of the anode material slurry is 65%. Before the slurry is prepared, the lithium iron phosphate needs to be baked for 12 hours at 135 ℃, and the conductive agent needs to be baked for 5 hours at 120 ℃.
2) Preparing anode material slurry: preparing cathode slurry by taking deionized water as a medium, adding a thickening agent into the deionized water, stirring for 2 hours, then adding a conductive agent, stirring for 2 hours to completely disperse the conductive agent, then adding a cathode active material, stirring for 5 hours, then adding an adhesive, stirring for 3 hours, and sieving the obtained slurry for 2 times to obtain cathode material slurry, wherein the solid content of the cathode material slurry is 38%;
(2) coating of positive and negative electrodes
Uniformly coating the positive electrode material slurry on the positive and negative surfaces of a first coating area and a second coating area of a positive electrode current collector, reserving a positive electrode lug, and ensuring that the coating surface density of the positive electrode is 24mg/cm2Simultaneously, Al is uniformly coated on the front and back surfaces of the connecting area2O3Coating, and then baking in an oven at 120 ℃; evenly coating the positive and negative surfaces of the negative current collector with negative material slurry, reserving a negative electrode lug, and enabling the density of the coated surface of the negative electrode to be 13mg/cm2Then, placing the coated negative electrode in an oven at 90 ℃ for baking;
(3) pole piece rolling and cutting
Rolling the coated positive pole piece and negative pole piece, wherein the compaction density of the positive pole is 2.4g/cm3The compacted density of the negative electrode is 1.4g/cm3Then, carrying out laser cutting on the rolled positive and negative pole pieces according to the manufacturing specification of the battery pole pieces, and accurately reserving the positive pole piece connecting area and the positive and negative pole lug positions during laser cutting;
(4) pole piece baking method
Baking the cut pole piece in a vacuum state, baking the positive pole piece at the temperature of 130 ℃ for 10 hours, baking the negative pole piece at the temperature of 80 ℃ for 11 hours, continuously exhausting argon for 4 times every 4 hours in the baking process, continuously exhausting argon for 4 times after baking is finished, cooling the pole piece to be below 45 ℃ in the vacuum state, and taking out the pole piece to perform subsequent processes;
(5) preparation of battery core
Superposing the baked positive pole piece, negative pole piece and diaphragm to form a diaphragm/negative pole/diaphragm/positive pole laminated structure battery cell;
(6) welding positive and negative pole lugs, embedding and packaging battery cell
Respectively welding a positive electrode lug and a negative electrode lug on reserved current collectors of positive and negative electrode plates according to the design requirements of the battery, then placing a battery cell into a punched battery shell, and thermally sealing the top and one side edge of the battery by using a sealing machine under the conditions of the temperature of 250 ℃, the pressure of 0.4Mpa and the time of 7 seconds;
(7) battery core baking and battery liquid injection
Baking the battery core for 20 hours at 80 ℃ in a vacuum state, continuously pumping and discharging argon for 3 times every 5 hours in the baking process, continuously pumping and discharging argon for 5 times after baking is finished, cooling the pole piece to be below 45 ℃ in the vacuum state, taking out the battery core for a liquid injection process, thermally sealing the other side edge of the battery, and then placing the battery for 24 hours;
(8) formation and capacity grading of battery
The time-limited formation is adopted, and the formation process comprises the following steps: charging at 0.05C for 5 hours, +0.1C for 4 hours, +0.2C for 2.5 hours, then degassing, heat-sealing, cutting edges and shaping the battery; the battery capacity grading process comprises the following steps: the battery is charged to 3.65V at a constant current of 1C, then to 3.65V at a constant current and a constant voltage, the cut-off current is 0.05C, and then to 2.0V at 1C, and the discharged capacity of the battery is the battery capacity.
Example 6
The soft-package lithium iron phosphate power battery of the embodiment has a structure basically the same as that of embodiment 3, and the difference is mainly that: the positive current collector adopts an aluminum foil with the thickness of 18 mu m, the diaphragm thickness is 12 mu m, the electrolyte adopts a mixture of lithium hexafluorophosphate, diethyl carbonate and ethyl propylene carbonate, the length of the connecting area is 1/8 of the length of the first coating area and the second coating area, and the width of the connecting area is 1/66 of the width of the first coating area and the second coating area.
In this embodiment, the thickness of the positive electrode material layer is 110 μm, and the positive electrode material layer is composed of the following components in percentage by mass: 91% of lithium iron phosphate, 1% of superconducting carbon, 3% of conductive graphite and 5% of polyvinylidene fluoride. The negative current collector adopts a copper foil with the thickness of 13 mu m, the thickness of a negative material layer on the surface of the negative current collector is 126 mu m, and the negative material layer consists of the following components in percentage by mass: 93 percent of (artificial graphite, natural graphite and mesocarbon microbeads), 2 percent of conductive carbon black, 4 percent of styrene butadiene rubber and 1 percent of sodium carboxymethylcellulose.
The preparation method of the soft-package lithium iron phosphate power battery comprises the following steps:
(1) preparation of the slurry
1) Preparing positive electrode material slurry: preparing anode slurry by taking N-methyl pyrrolidone as a solvent, adding a binder into the N-methyl pyrrolidone, carrying out vacuum stirring for 2 hours under the condition of circulating water cooling, then adding a uniformly mixed mixture of lithium iron phosphate and a conductive agent, adding the mixture, stirring for 6 hours, and sieving the obtained slurry for 3 times to obtain the anode material slurry, wherein the solid content of the anode material slurry is 70%. Before the preparation of the slurry, the lithium iron phosphate needs to be baked for 16 hours at 145 ℃, and the conductive agent needs to be baked for 4 hours at 145 ℃.
2) Preparing anode material slurry: preparing cathode slurry by taking deionized water as a medium, adding a thickening agent into the deionized water, stirring for 1 hour, then adding a conductive agent, stirring for 4 hours to completely disperse the conductive agent, then adding a cathode active material, stirring for 3 hours, then adding an adhesive, stirring for 3 hours, and sieving the obtained slurry for 1 time to obtain cathode material slurry, wherein the solid content of the cathode material slurry is 40%;
(2) coating of positive and negative electrodes
Uniformly coating the positive electrode material slurry on the positive and negative surfaces of a first coating area and a second coating area of a positive electrode current collector, reserving a positive electrode lug, and ensuring that the coating surface density of the positive electrode is 23mg/cm2Simultaneously, Al is uniformly coated on the front and back surfaces of the connecting area2O3Coating, and then baking in an oven at 115 ℃; coating the positive and negative surfaces of the negative current collector with the negative material slurry uniformly, andreserving a negative electrode ear position, wherein the negative electrode coating surface density is 12mg/cm2Then, placing the coated negative electrode in an oven at 105 ℃ for baking;
(3) pole piece rolling and cutting
Rolling the coated positive pole piece and negative pole piece, wherein the compaction density of the positive pole is 2.4g/cm3The compacted density of the negative electrode is 1.5g/cm3Then, carrying out laser cutting on the rolled positive and negative pole pieces according to the manufacturing specification of the battery pole pieces, and accurately reserving the positive pole piece connecting area and the positive and negative pole lug positions during laser cutting;
(4) pole piece baking method
Baking the cut pole piece in a vacuum state, baking the positive pole piece at the temperature of 125 ℃ for 11.5 hours, baking the negative pole piece at the temperature of 90 ℃ for 10.5 hours, continuously exhausting argon for 3 times every 2.5 hours in the baking process, continuously exhausting argon for 5 times after baking is finished, cooling the pole piece to be below 45 ℃ in the vacuum state, and taking out the pole piece for subsequent processes;
(5) preparation of battery core
Superposing the baked positive pole piece, negative pole piece and diaphragm to form a diaphragm/negative pole/diaphragm/positive pole laminated structure battery cell;
(6) welding positive and negative pole lugs, embedding and packaging battery cell
Respectively welding a positive electrode lug and a negative electrode lug on reserved current collectors of positive and negative electrode plates according to the design requirements of the battery, then placing a battery cell into a punched battery shell, and thermally sealing the top and one side edge of the battery by using a sealing machine under the conditions that the temperature is 220 ℃, the pressure is 0.3Mpa and the time is 9 seconds;
(7) battery core baking and battery liquid injection
Baking the battery core for 21 hours at 85 ℃ in a vacuum state, continuously pumping and discharging argon for 4 times every 4.5 hours in the baking process, continuously pumping and discharging the argon for 4 times after baking is finished, cooling the pole piece to be below 45 ℃ in the vacuum state, taking out the battery core for a liquid injection process, thermally sealing the other side edge of the battery, and standing the battery for 24 hours;
(8) formation and capacity grading of battery
The time-limited formation is adopted, and the formation process comprises the following steps: charging at 0.05C for 5 hours, +0.1C for 4 hours, +0.2C for 2.5 hours, then degassing, heat-sealing, cutting edges and shaping the battery; the battery capacity grading process comprises the following steps: the battery is charged to 3.65V at a constant current of 1C, then to 3.65V at a constant current and a constant voltage, the cut-off current is 0.05C, and then to 2.0V at 1C, and the discharged capacity of the battery is the battery capacity.
Example 7
The soft-package lithium iron phosphate power battery of the embodiment has a structure basically the same as that of embodiment 3, and the difference is mainly that: the electrolyte is diethyl carbonate, the length of the connecting area is 1/10 of the length of the first coating area and the second coating area, and the width of the connecting area is 1/68 of the width of the first coating area and the second coating area.
The preparation method of the soft-package lithium iron phosphate power battery comprises the following steps:
(1) preparation of the slurry
1) Preparing positive electrode material slurry: preparing anode slurry by taking N-methyl pyrrolidone as a solvent, adding a binder into the N-methyl pyrrolidone, carrying out vacuum stirring for 3 hours under the condition of circulating water cooling, then adding a uniformly mixed mixture of lithium iron phosphate and a conductive agent, adding the mixture, stirring for 5 hours, and sieving the obtained slurry for 3 times to obtain the anode material slurry, wherein the solid content of the anode material slurry is 65%.
2) Preparing anode material slurry: preparing cathode slurry by taking deionized water as a medium, adding a thickening agent into the deionized water, stirring for 1 hour, then adding a conductive agent, stirring for 3 hours to completely disperse the conductive agent, then adding a cathode active material, stirring for 3 hours, then adding an adhesive, stirring for 3 hours, and sieving the obtained slurry for 1 time to obtain cathode material slurry, wherein the solid content of the cathode material slurry is 43%;
(2) coating of positive and negative electrodes
Uniformly coating the positive electrode material slurry on the positive and negative surfaces of a first coating area and a second coating area of a positive electrode current collector, reserving a positive electrode lug, and ensuring that the coating surface density of the positive electrode is 22mg/cm2At the same time, the front and back sides of the connecting area are uniformCoated with Al2O3Coating, and then baking in an oven at 110 ℃; evenly coating the positive and negative surfaces of the negative current collector with negative material slurry, reserving a negative electrode lug, and enabling the density of the coated surface of the negative electrode to be 11.4mg/cm2Then, the coated negative electrode is placed in an oven with the temperature of 100 ℃ for baking;
(3) pole piece rolling and cutting
Rolling the coated positive pole piece and negative pole piece, wherein the compaction density of the positive pole is 2.2g/cm3The compacted density of the negative electrode is 1.3g/cm3Then, carrying out laser cutting on the rolled positive and negative pole pieces according to the manufacturing specification of the battery pole pieces, and accurately reserving the positive pole piece connecting area and the positive and negative pole lug positions during laser cutting;
(4) pole piece baking method
Baking the cut pole piece in a vacuum state, baking a positive pole piece at the temperature of 125 ℃ for 11 hours, baking a negative pole piece at the temperature of 90 ℃ for 10 hours, continuously exhausting argon for 3 times every 2 hours in the baking process, continuously exhausting argon for 5 times after baking is finished, cooling the pole piece to be below 45 ℃ in the vacuum state, and taking out the pole piece to perform subsequent processes;
(5) preparation of battery core
Superposing the baked positive pole piece, negative pole piece and diaphragm to form a diaphragm/negative pole/diaphragm/positive pole laminated structure battery cell;
(6) welding positive and negative pole lugs, embedding and packaging battery cell
Respectively welding a positive electrode lug and a negative electrode lug on reserved current collectors of positive and negative electrode plates according to the design requirements of the battery, then placing a battery cell into a punched battery shell, and thermally sealing the top and one side edge of the battery by using a sealing machine under the conditions of 210 ℃, 0.3Mpa of pressure and 10 seconds of time;
(7) battery core baking and battery liquid injection
Baking the battery core for 21 hours at 85 ℃ in a vacuum state, continuously pumping and discharging argon for 4 times every 4 hours in the baking process, continuously pumping and discharging the argon for 4 times after baking is finished, cooling the pole piece to be below 45 ℃ in the vacuum state, taking out the battery core for a liquid injection process, thermally sealing the other side edge of the battery, and then placing the battery for 24 hours;
(8) formation and capacity grading of battery
The time-limited formation is adopted, and the formation process comprises the following steps: charging at 0.05C for 5 hours, +0.1C for 4 hours, +0.2C for 2.5 hours, then degassing, heat-sealing, cutting edges and shaping the battery; the battery capacity grading process comprises the following steps: the battery is charged to 3.65V at a constant current of 1C, then to 3.65V at a constant current and a constant voltage, the cut-off current is 0.05C, and then to 2.0V at 1C, and the discharged capacity of the battery is the battery capacity.
Example 8
The soft-package lithium iron phosphate power battery of the embodiment has a structure basically the same as that of embodiment 3, and the difference is mainly that: the positive current collector adopts an aluminum foil with the thickness of 16 mu m, the diaphragm adopts a non-woven fabric diaphragm, the thickness of the diaphragm is 14 mu m, the electrolyte adopts dimethyl carbonate, the length of the connecting area is 1/10 of the length of the first coating area and the second coating area, and the width of the connecting area is 1/65 of the width of the first coating area and the second coating area.
In this embodiment, the positive electrode material layer is composed of the following components in percentage by mass: 94% of lithium iron phosphate, 1% of conductive carbon black, 2% of flake graphite and 3% of polyvinylidene fluoride. The negative current collector adopts a copper foil with the thickness of 13 mu m, the thickness of a negative material layer on the surface of the negative current collector is 122 mu m, and the negative material layer consists of the following components in percentage by mass: 93% of mesocarbon microbeads, 2% of superconducting carbon, 3% of styrene butadiene rubber and 2% of sodium carboxymethyl cellulose.
The preparation method of the soft-package lithium iron phosphate power battery comprises the following steps:
(1) preparation of the slurry
1) Preparing positive electrode material slurry: preparing anode slurry by taking N-methyl pyrrolidone as a solvent, adding a binder into the N-methyl pyrrolidone, carrying out vacuum stirring for 3 hours under the condition of circulating water cooling, then adding a uniformly mixed mixture of lithium iron phosphate and a conductive agent, adding the mixture, stirring for 5 hours, and sieving the obtained slurry for 2 times to obtain the anode material slurry, wherein the solid content of the anode material slurry is 72%. Before the preparation of the slurry, the lithium iron phosphate is baked for 15 hours at 135 ℃, and the conductive agent is baked for 6 hours at 120 ℃.
2) Preparing anode material slurry: preparing cathode slurry by taking deionized water as a medium, adding a thickening agent into the deionized water, stirring for 3 hours, then adding a conductive agent, stirring for 2 hours to completely disperse the conductive agent, then adding a cathode active material, stirring for 2 hours, then adding an adhesive, stirring for 3 hours, and sieving the obtained slurry for 2 times to obtain cathode material slurry, wherein the solid content of the cathode material slurry is 50%;
(2) coating of positive and negative electrodes
Uniformly coating the positive electrode material slurry on the positive and negative surfaces of a first coating area and a second coating area of a positive electrode current collector, reserving a positive electrode lug, and enabling the positive electrode coating surface density to be 25mg/cm2Simultaneously, Al is uniformly coated on the front and back surfaces of the connecting area2O3Coating, and then baking in an oven at 95 ℃; evenly coating the positive and negative surfaces of the negative current collector with negative material slurry, reserving a negative electrode lug, and enabling the density of the coated surface of the negative electrode to be 13.6mg/cm2Then, placing the coated negative electrode in an oven at 90 ℃ for baking;
(3) pole piece rolling and cutting
Rolling the coated positive pole piece and negative pole piece, wherein the positive pole compaction density is 2.0g/cm3The compacted density of the negative electrode is 1.6g/cm3Then, carrying out laser cutting on the rolled positive and negative pole pieces according to the manufacturing specification of the battery pole pieces, and accurately reserving the positive pole piece connecting area and the positive and negative pole lug positions during laser cutting;
(4) pole piece baking method
Baking the cut pole piece in a vacuum state, baking a positive pole piece for 12 hours at the temperature of 115 ℃, baking a negative pole piece for 10 hours at the temperature of 95 ℃, continuously exhausting argon for 3 times every 4 hours in the baking process, continuously exhausting argon for 5 times after baking is finished, cooling the pole piece to be below 45 ℃ in the vacuum state, and taking out the pole piece for subsequent processes;
(5) preparation of battery core
Superposing the baked positive pole piece, negative pole piece and diaphragm to form a diaphragm/negative pole/diaphragm/positive pole laminated structure battery cell;
(6) welding positive and negative pole lugs, embedding and packaging battery cell
Respectively welding a positive electrode lug and a negative electrode lug on reserved current collectors of positive and negative electrode plates according to the design requirements of the battery, then placing a battery cell into a punched battery shell, and thermally sealing the top and one side edge of the battery by using a sealing machine under the conditions of the temperature of 250 ℃, the pressure of 0.4Mpa and the time of 5 seconds;
(7) battery core baking and battery liquid injection
Baking the battery cell for 24 hours at 120 ℃ in a vacuum state, continuously pumping argon for 4 times every 4 hours in the baking process, continuously pumping argon for 3 times after baking is finished, cooling the pole piece to below 45 ℃ in the vacuum state, taking out the battery cell for a liquid injection process, thermally sealing the other side edge of the battery, and then placing the battery for 24 hours;
(8) formation and capacity grading of battery
The time-limited formation is adopted, and the formation process comprises the following steps: charging at 0.05C for 5 hours, +0.1C for 4 hours, +0.2C for 2.5 hours, then degassing, heat-sealing, cutting edges and shaping the battery; the battery capacity grading process comprises the following steps: the battery is charged to 3.65V at a constant current of 1C, then to 3.65V at a constant current and a constant voltage, the cut-off current is 0.05C, and then to 2.0V at 1C, and the discharged capacity of the battery is the battery capacity.
Example 9
The soft-package lithium iron phosphate power battery of the embodiment has a structure basically the same as that of embodiment 3, and the difference is mainly that: the positive current collector adopts an aluminum foil with the thickness of 13 mu m, the diaphragm thickness is 25 mu m, the electrolyte adopts a mixture of lithium hexafluorophosphate and ethyl propyl carbonate, the length of the connecting area is 1/8 of the length of the first coating area and the second coating area, and the width of the connecting area is 1/67 of the width of the first coating area and the second coating area.
In this embodiment, the positive electrode material layer is composed of the following components in percentage by mass: 92% of lithium iron phosphate, 1% of conductive carbon black, 2% of superconducting carbon, 3% of conductive graphite and 2% of polyvinylidene fluoride. The negative current collector adopts a copper foil with the thickness of 13 mu m, the thickness of a negative material layer on the surface of the negative current collector is 125 mu m, and the negative material layer consists of the following components in percentage by mass: 92% of artificial graphite, 2% of conductive carbon black, 2% of superconducting carbon, 1% of conductive graphite, 2% of butadiene styrene rubber and 1% of sodium carboxymethylcellulose.
The preparation method of the soft-package lithium iron phosphate power battery comprises the following steps:
(1) preparation of the slurry
1) Preparing positive electrode material slurry: preparing anode slurry by taking N-methyl pyrrolidone as a solvent, adding a binder into the N-methyl pyrrolidone, carrying out vacuum stirring for 2.5 hours under the condition of circulating water cooling, then adding a uniformly mixed mixture of lithium iron phosphate and a conductive agent, adding the mixture, stirring for 4 hours, and sieving the obtained slurry for 4 times to obtain the anode material slurry, wherein the solid content of the anode material slurry is 65%. Before the preparation of the slurry, the lithium iron phosphate is baked for 12 hours at 150 ℃, and the conductive agent is baked for 4 hours at 150 ℃.
2) Preparing anode material slurry: preparing cathode slurry by taking deionized water as a medium, adding a thickening agent into the deionized water, stirring for 2.5 hours, then adding a conductive agent, stirring for 4 hours to completely disperse the conductive agent, then adding a cathode active material, stirring for 2 hours, then adding an adhesive, stirring for 3 hours, and sieving the obtained slurry for 3 times to obtain cathode material slurry, wherein the solid content of the cathode material slurry is 47%;
(2) coating of positive and negative electrodes
Uniformly coating the positive electrode material slurry on the positive and negative surfaces of a first coating area and a second coating area of a positive electrode current collector, reserving a positive electrode lug, and ensuring that the coating surface density of the positive electrode is 30mg/cm2Simultaneously, Al is uniformly coated on the front and back surfaces of the connecting area2O3Coating, and then baking in an oven at 120 ℃; evenly coating the positive and negative surfaces of the negative current collector with negative material slurry, reserving a negative electrode lug, and enabling the density of the coated surface of the negative electrode to be 16.2mg/cm2Then, placing the coated negative electrode in an oven at 70 ℃ for baking;
(3) pole piece rolling and cutting
Will be coated withRolling the positive pole piece and the negative pole piece, wherein the positive pole compaction density is 2.3g/cm3The compacted density of the negative electrode is 1.4g/cm3Then, carrying out laser cutting on the rolled positive and negative pole pieces according to the manufacturing specification of the battery pole pieces, and accurately reserving the positive pole piece connecting area and the positive and negative pole lug positions during laser cutting;
(4) pole piece baking method
Baking the cut pole piece in a vacuum state, baking a positive pole piece at the temperature of 111 ℃ for 12 hours, baking a negative pole piece at the temperature of 98 ℃ for 12 hours, continuously exhausting argon for 4 times every 2 hours in the baking process, continuously exhausting argon for 5 times after baking is finished, cooling the pole piece to be below 45 ℃ in the vacuum state, and taking out the pole piece to perform subsequent processes;
(5) preparation of battery core
Superposing the baked positive pole piece, negative pole piece and diaphragm to form a diaphragm/negative pole/diaphragm/positive pole laminated structure battery cell;
(6) welding positive and negative pole lugs, embedding and packaging battery cell
Respectively welding a positive electrode lug and a negative electrode lug on reserved current collectors of positive and negative electrode plates according to the design requirements of the battery, then placing a battery cell into a punched battery shell, and thermally sealing the top and one side edge of the battery by using a sealing machine under the conditions of 175 ℃, 0.3Mpa of pressure and 10 seconds of time;
(7) battery core baking and battery liquid injection
Baking the battery cell for 24 hours at 80 ℃ in a vacuum state, continuously pumping argon for 4 times every 6 hours in the baking process, continuously pumping argon for 3 times after baking is finished, cooling the pole piece to be below 45 ℃ in the vacuum state, taking out the battery cell for a liquid injection process, thermally sealing the other side edge of the battery, and then placing the battery for 24 hours;
(8) formation and capacity grading of battery
The time-limited formation is adopted, and the formation process comprises the following steps: charging at 0.05C for 5 hours, +0.1C for 4 hours, +0.2C for 2.5 hours, then degassing, heat-sealing, cutting edges and shaping the battery; the battery capacity grading process comprises the following steps: the battery is charged to 3.65V at a constant current of 1C, then to 3.65V at a constant current and a constant voltage, the cut-off current is 0.05C, and then to 2.0V at 1C, and the discharged capacity of the battery is the battery capacity.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a soft packet of lithium iron phosphate power battery, its characterized in that, includes positive pole piece, negative pole piece, diaphragm, electrolyte and battery case, positive pole piece, negative pole piece and diaphragm form diaphragm/negative pole/diaphragm/anodal lamination formula structure battery core, positive pole piece includes the anodal mass flow body, the anodal mass flow body includes first coating district, second coating district and joining region, first coating district links to each other through the joining region with the second coating district, the length of joining region is less than the length in first coating district and second coating district, and the positive and negative sides in first coating district and second coating district all are equipped with the anodal material layer, negative pole piece comprises negative current collector and negative material layer, negative material layer coating locates negative current collector tow sides, the diaphragm adopts polyethylene + ceramic coating diaphragm, diaphragm thickness is 12 mu m ~ 30 mu m, the electrolyte is one or a mixture of more of lithium hexafluorophosphate, methyl ethyl carbonate, ethylene carbonate, dimethyl carbonate, diethyl carbonate and propylene carbonate, and the battery shell is packaged by an aluminum plastic film.
2. The soft-package lithium iron phosphate power battery according to claim 1, wherein the positive electrode material layer is composed of a lithium iron phosphate material, polyvinylidene fluoride and a conductive agent, and the conductive agent is one or more of conductive carbon black, superconducting carbon, conductive graphite, flake graphite and carbon nanotubes.
3. The soft-package lithium iron phosphate power battery of claim 1, wherein the negative electrode material layer is composed of a negative electrode active material, a conductive agent, sodium carboxymethylcellulose and styrene butadiene rubber, the negative electrode active material is one or more of artificial graphite, natural graphite, mesocarbon microbeads and hard carbon materials, and the conductive agent is one or more of conductive carbon black, superconducting carbon and conductive graphite.
4. The soft-package lithium iron phosphate power battery as claimed in claim 1, wherein the negative current collector is made of copper foil, the thickness of the negative current collector is 8-15 μm, and the thickness of the negative material layer on the surface of the negative current collector is 120-130 μm.
5. The soft-package lithium iron phosphate power battery of claim 1, wherein the positive electrode material layer comprises the following components in percentage by mass: 91-96% of lithium iron phosphate, 1-4% of superconducting carbon, 1-3% of conductive graphite, 0-2% of carbon nano tube and 1.5-5% of polyvinylidene fluoride.
6. The soft-package lithium iron phosphate power battery of claim 1, wherein the negative electrode material layer comprises the following components in percentage by mass: 91-95% of negative active material, 0-2% of conductive carbon black, 0-2% of conductive graphite, 2-4% of styrene butadiene rubber and 1-2% of sodium carboxymethylcellulose.
7. The soft-package lithium iron phosphate power battery of claim 1, wherein a positive tab is provided on the positive pole piece.
8. The soft-package lithium iron phosphate power battery of claim 1, wherein a negative electrode tab is provided on the negative electrode plate.
9. A preparation method of a soft-package lithium iron phosphate power battery is characterized by specifically comprising the following steps:
(1) preparation of the slurry
1) Preparing positive electrode material slurry: preparing anode slurry by taking N-methyl pyrrolidone as a solvent, adding a binder into the N-methyl pyrrolidone, stirring for 2-3 hours in vacuum under the condition of circulating water cooling, adding a uniformly mixed mixture of lithium iron phosphate and a conductive agent, adding the mixture, stirring for 3-6 hours, and sieving the obtained slurry to obtain anode material slurry;
2) preparing anode material slurry: adding a thickening agent into deionized water, stirring for 1-3 hours, then adding a conductive agent, continuously stirring for 2-4 hours, passing the slurry through a colloid mill to completely disperse the conductive agent, then adding a negative electrode active material, stirring for 2-5 hours, then adding an adhesive, stirring for 2-3 hours, and sieving the obtained slurry to obtain negative electrode material slurry;
(2) coating of positive and negative electrodes
Uniformly coating positive electrode material slurry on the front and back surfaces of a first coating area and a second coating area of a positive electrode current collector, reserving a positive electrode lug, and enabling the coating surface density of the positive electrode to be 22-23 mg/cm2Simultaneously, Al is uniformly coated on the front and back surfaces of the connecting area2O3Coating, and then baking in an oven at 95-120 ℃; uniformly coating the positive and negative surfaces of the negative current collector with negative material slurry, reserving a negative electrode lug, and enabling the density of the coated surface of the negative electrode to be 10-11 mg/cm2Then, placing the coated negative electrode in an oven at 70-110 ℃ for baking;
(3) pole piece rolling and cutting
Carrying out rolling treatment on the coated positive pole piece and negative pole piece, wherein the positive pole compaction density is 2.2-2.3 g/cm3The compacted density of the negative electrode is 1.4-1.6 g/cm3Then, carrying out laser cutting on the rolled positive and negative pole pieces according to the manufacturing specification of the battery pole pieces, and accurately reserving the positive pole piece connecting area and the positive and negative pole lug positions during laser cutting;
(4) pole piece baking method
Baking the cut pole piece in a vacuum state, baking a positive pole piece at the temperature of 100-130 ℃ for 10-12 hours, baking a negative pole piece at the temperature of 80-100 ℃ for 10-12 hours, continuously exhausting argon for 3-5 times every 2-4 hours in the baking process, continuously exhausting argon for 3-5 times after baking is finished, cooling the pole piece to be below 45 ℃ in the vacuum state, and taking out the pole piece for subsequent processes;
(5) preparation of battery core
Superposing the baked positive pole piece, negative pole piece and diaphragm to form a diaphragm/negative pole/diaphragm/positive pole laminated structure battery cell;
(6) welding positive and negative pole lugs, embedding and packaging battery cell
Respectively welding a positive electrode lug and a negative electrode lug on reserved current collectors of positive and negative electrode plates according to the design requirements of the battery, then placing a battery cell into a punched battery shell, and thermally sealing the top and one side edge of the battery by using a sealing machine under the conditions that the temperature is 150-250 ℃, the pressure is 0.2-0.5 Mpa and the time is 5-10 seconds;
(7) battery core baking and battery liquid injection
Baking the battery cell for 20-24 hours at 80-120 ℃ in a vacuum state, continuously pumping argon for 2-4 times every 4-6 hours in the baking process, continuously pumping argon for 3-5 times after baking is finished, cooling the pole piece to be below 45 ℃ in the vacuum state, taking out the battery cell for a liquid injection process, thermally sealing the other side edge of the battery, and then placing the battery for 24 hours;
(8) formation and capacity grading of battery
The time-limited formation is adopted, and the formation process comprises the following steps: charging at 0.05C for 5 hours, +0.1C for 4 hours, +0.2C for 2.5 hours, then degassing, heat-sealing, cutting edges and shaping the battery; the battery capacity grading process comprises the following steps: the battery is charged to 3.65V at a constant current of 1C, then to 3.65V at a constant current and a constant voltage, the cut-off current is 0.05C, and then to 2.0V at 1C, and the discharged capacity of the battery is the battery capacity.
10. The soft-package lithium iron phosphate power battery according to claim 9, wherein the solid content of the negative electrode material slurry is 38-50%, the solid content of the positive electrode material slurry is 60-75%, the ratio of the positive electrode coating surface density to the negative electrode coating surface density is 1 (0.5-0.7), and before the slurry preparation, the lithium iron phosphate is baked at 120-150 ℃ for 12-24 hours, and the conductive agent is baked at 120-150 ℃ for 4-6 hours.
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