CN113948757A - Polymer lithium ion battery and manufacturing method thereof - Google Patents
Polymer lithium ion battery and manufacturing method thereof Download PDFInfo
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- CN113948757A CN113948757A CN202010685004.3A CN202010685004A CN113948757A CN 113948757 A CN113948757 A CN 113948757A CN 202010685004 A CN202010685004 A CN 202010685004A CN 113948757 A CN113948757 A CN 113948757A
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 229920000642 polymer Polymers 0.000 title claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000003792 electrolyte Substances 0.000 claims abstract description 30
- 239000010439 graphite Substances 0.000 claims abstract description 22
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 22
- 238000005524 ceramic coating Methods 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 21
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 38
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 32
- 238000005096 rolling process Methods 0.000 claims description 30
- 239000002041 carbon nanotube Substances 0.000 claims description 23
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 23
- 239000011248 coating agent Substances 0.000 claims description 22
- 238000000576 coating method Methods 0.000 claims description 22
- 238000004804 winding Methods 0.000 claims description 22
- 238000003756 stirring Methods 0.000 claims description 20
- 238000007789 sealing Methods 0.000 claims description 17
- 239000006256 anode slurry Substances 0.000 claims description 16
- 239000012528 membrane Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 14
- 239000000377 silicon dioxide Substances 0.000 claims description 14
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 13
- 239000006259 organic additive Substances 0.000 claims description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- 238000005056 compaction Methods 0.000 claims description 12
- 239000011267 electrode slurry Substances 0.000 claims description 12
- 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 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 10
- 239000002033 PVDF binder Substances 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 10
- 239000002270 dispersing agent Substances 0.000 claims description 10
- 238000009826 distribution Methods 0.000 claims description 10
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims description 10
- 229910003002 lithium salt Inorganic materials 0.000 claims description 10
- 159000000002 lithium salts Chemical class 0.000 claims description 10
- 239000003960 organic solvent Substances 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 10
- -1 polyethylene Polymers 0.000 claims description 10
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 10
- 239000002109 single walled nanotube Substances 0.000 claims description 10
- 238000003466 welding Methods 0.000 claims description 10
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 9
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 9
- 238000004806 packaging method and process Methods 0.000 claims description 9
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 claims description 8
- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical group FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 claims description 8
- 229910013716 LiNi Inorganic materials 0.000 claims description 8
- 239000010426 asphalt Substances 0.000 claims description 8
- 239000007770 graphite material Substances 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 239000002985 plastic film Substances 0.000 claims description 7
- 229920006255 plastic film Polymers 0.000 claims description 7
- 239000013078 crystal Substances 0.000 claims description 6
- 238000002955 isolation Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910001290 LiPF6 Inorganic materials 0.000 claims description 5
- 239000004677 Nylon Substances 0.000 claims description 5
- 239000004698 Polyethylene Substances 0.000 claims description 5
- 239000004743 Polypropylene Substances 0.000 claims description 5
- 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 5
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 5
- 239000011889 copper foil Substances 0.000 claims description 5
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 238000011049 filling Methods 0.000 claims description 5
- 239000011888 foil Substances 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 229920001778 nylon Polymers 0.000 claims description 5
- 229920000573 polyethylene Polymers 0.000 claims description 5
- 229920001155 polypropylene Polymers 0.000 claims description 5
- 239000011163 secondary particle Substances 0.000 claims description 5
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 5
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 5
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 5
- ZPFAVCIQZKRBGF-UHFFFAOYSA-N 1,3,2-dioxathiolane 2,2-dioxide Chemical compound O=S1(=O)OCCO1 ZPFAVCIQZKRBGF-UHFFFAOYSA-N 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 229910052593 corundum Inorganic materials 0.000 claims description 4
- VEWLDLAARDMXSB-UHFFFAOYSA-N ethenyl sulfate;hydron Chemical compound OS(=O)(=O)OC=C VEWLDLAARDMXSB-UHFFFAOYSA-N 0.000 claims description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 4
- 239000011257 shell material Substances 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 4
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 3
- 239000006257 cathode slurry Substances 0.000 claims description 2
- 229910052681 coesite Inorganic materials 0.000 claims description 2
- 229910052906 cristobalite Inorganic materials 0.000 claims description 2
- 229910052682 stishovite Inorganic materials 0.000 claims description 2
- 229910052905 tridymite Inorganic materials 0.000 claims description 2
- 239000007773 negative electrode material Substances 0.000 abstract description 7
- 230000014759 maintenance of location Effects 0.000 abstract description 6
- 230000005501 phase interface Effects 0.000 abstract description 5
- 239000007784 solid electrolyte Substances 0.000 abstract description 5
- 239000007774 positive electrode material Substances 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 239000006258 conductive agent Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 229910052814 silicon oxide Inorganic materials 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000010406 cathode material Substances 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 239000011149 active material Substances 0.000 description 2
- 239000013543 active substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002210 silicon-based material Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 241000872198 Serjania polyphylla Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000003571 electronic cigarette Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000007785 strong electrolyte Substances 0.000 description 1
- 229920001567 vinyl ester resin Polymers 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
- 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
- H01M10/0567—Liquid materials characterised by the additives
-
- 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
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound 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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
- H01M4/386—Silicon or alloys based on silicon
-
- 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
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
-
- 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
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
-
- 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
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
-
- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
-
- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a polymer lithium ion battery and a manufacturing method thereof, wherein a high-voltage positive electrode material is selected to improve the specific capacity of a positive electrode, a proper amount of silicon carbon material with high specific capacity is mixed into graphite to improve the specific capacity of a negative electrode material, a compact and stable solid electrolyte phase interface is formed by matching proper electrolyte, and the liquid retention capacity and the safety performance of the battery are improved by selecting a double-sided inorganic ceramic coating diaphragm. The lithium ion battery has the characteristics of high energy density and good cycle performance.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a polymer lithium ion battery and a manufacturing method thereof.
Background
The lithium ion battery has the advantages of high average working voltage, high energy density, long cycle life, small self-discharge, no memory effect, better safety performance and small pollution, and is widely applied to the fields of electric automobiles, computers, mobile phones, cameras, electric bicycles, mobile power supplies, Bluetooth earphones, electronic cigarettes, medical equipment, energy storage, military industry, aerospace and the like.
The upper limit of the working voltage interval of the lithium ion battery is generally 4.2V-4.25V, the energy density of the lithium ion battery can be improved by increasing the upper limit of the working voltage of the lithium ion battery, but the upper limit of the working voltage of the lithium ion battery is increased, the electrolyte and an electrode material are easy to generate a series of side reactions, and the performance of the battery is reduced. The lithium ion battery negative electrode material is mainly a graphite material, the theoretical specific capacity of the graphite material is 372mAh/g with a lower level, the theoretical specific capacity of a silicon simple substance is 4200mAh/g, the theoretical specific capacity of the silicon oxide is 2043mAh/g, the graphite material and the simple substance silicon or the silicon oxide are jointly used on the negative electrode of the lithium ion battery, the specific capacity of the negative electrode material can be improved, and therefore the energy density of the battery is improved, but the simple substance silicon or the silicon oxide has a serious volume effect in the charging and discharging processes, the negative electrode material is easy to be pulverized, and meanwhile, a solid electrolyte phase interface film formed on the surface of the simple substance silicon or the silicon oxide can be repeatedly damaged and generated in the charging and discharging processes, so that the irreversible attenuation of the capacity is caused.
Disclosure of Invention
In order to improve the upper limit of the working voltage interval of the lithium ion battery, apply the silicon material with high specific capacity to the negative electrode of the lithium ion battery, relieve the obvious volume effect of the silicon material in the charging and discharging process and increase the electrolyte retention capacity of the battery, the invention provides a polymer lithium ion battery and a manufacturing method thereof, which can improve the energy density and the cycle performance of the lithium ion battery.
In order to achieve the purpose, the invention adopts the following technical scheme:
a polymer lithium ion battery and a manufacturing method thereof are provided, wherein the polymer lithium ion battery comprises a positive electrode, a negative electrode, an isolating membrane, electrolyte and a packaging shell.
Further, the positive electrode comprises the following components in percentage by mass: high voltage (4.35V or 4.4V) nickel cobalt lithium manganate 532 ternary (LiNi)0.5Co0.2Mn0.3O2) 96-98% of material, 0.4-0.8% of conductive graphite, 0.5-1.0% of carbon nano tube and 1.3-1.6% of polyvinylidene fluoride, wherein the high-voltage nickel cobalt lithium manganate 532 ternary material is of a single crystal or quasi-single crystal structure, the D50 is 4-8 mu m, and the specific surface area is 0.3m2/g~0.8m2The conductive graphite has D50 of 3-6 μm and a specific surface area of 10m2/g~22m2The carbon nano tube has a tube diameter of 3-12 nm, a tube length of 1-200 mu m, and the molecular weight of the polyvinylidene fluoride is 90-110 ten thousand. The high-voltage nickel cobalt lithium manganate ternary material is selected as an active substance of the positive electrode to provide a lithium source, so that the working voltage interval of the battery can be improved, and the energy density of the battery is further improved; the conductive graphite and the carbon nano tube are selected to be matched and used as a conductive agent of the anode, wherein the carbon nano tube has high conductivity, high heat conductivity and good electrolyte absorption capacity, the using amount of the conductive agent can be reduced, the proportion of active substances of the anode is increased, the internal resistance of the battery is reduced, the multiplying power performance and the cycle performance of the battery are improved, but the carbon nano tube has strong rigidity and can influence the compaction and flexibility of the anode plate, the conductive graphite can increase the compaction density of the anode and improve the flexibility of the anode plate, meanwhile, the conductive graphite also has strong electrolyte retention capacity, and the carbon nano tube and the conductive graphite jointly used for the anode of the lithium ion battery have synergistic effect.
Further, the negative electrode comprises the following components in percentage by mass: 82-89% of graphite, 6-12% of silicon carbon, 0.02-0.1% of carbon nano tube, 0.8-1.3% of conductive carbon black, 1.4-2.0% of sodium carboxymethyl cellulose and 2.3-3.0% of styrene butadiene rubber, wherein the graphite material is secondary particles, and D50 in particle size distribution is 11-16 mu m, and the specific ratio is 11-16 mu mSurface area 1.2m2/g~2.5m2The silicon-carbon material is asphalt carbon-coated silica, wherein the mass percent of asphalt carbon is 30% -50%, the mass percent of silica is 70% -50%, the carbon nano tube is a single-walled carbon nano tube, the length of the single-walled carbon nano tube is 1-200 mu m, the particle size distribution range of the conductive carbon black is 10-100 nm, and the specific surface area of the conductive carbon black is 50m2/g~100m2(ii) in terms of/g. The silicon-carbon material with high specific capacity and graphite are used as the active material of the lithium ion battery cathode, on one hand, the specific capacity of the active material of the cathode can be improved, further reducing the consumption of the cathode material, improving the energy density of the battery, on the other hand alleviating the volume effect of the silicon carbon material in the charging and discharging process, using the single-walled carbon nanotube and the conductive carbon black as the conductive agent of the cathode of the lithium ion battery, wherein the single-walled carbon nanotube has very excellent electric and heat conducting capacity, the electric conducting capacity of the cathode can be obviously improved by adding a small amount of single-walled carbon nanotubes, and the electric conducting carbon black with large specific surface area and the single-walled carbon nanotube are jointly used as the electric conducting agent of the lithium ion battery, thereby not only having synergistic effect, and the electrolyte retention capacity of the cathode material can be increased, so that the cathode material is fully soaked by the electrolyte, and the cycle performance of the battery is improved.
Further, the isolating membrane is a double-sided ceramic coating membrane, the base membrane of the isolating membrane is a polyethylene wet-process membrane, the thickness of the base membrane is 9-16 mu m, and coating materials on two sides of the base membrane are Al2O3(aluminum oxide), SiO2(silica), ZrO2(zirconium dioxide), Mg (OH)2And the thickness of the ceramic coating on the two sides of the base film is 2-5 mu m. The double-sided ceramic coating diaphragm is selected as the isolating membrane between the positive and negative pole pieces, so that the safety performance of the battery is improved, the electrolyte retaining quantity of the battery is improved, sufficient electrolyte is provided for the positive and negative pole pieces, the possibility of lithium precipitation is reduced, and the cycle performance of the battery is improved.
Further, the electrolyte contains lithium salt, organic solvent and organic additive, and the lithium salt is LiPF6(lithium hexafluorophosphate) in a concentration of 1mol/L, the organic solvent and the volume ratio thereof being EC (carbonic acid)Vinyl ester): EMC (ethyl methyl carbonate): DMC (dimethyl carbonate) = 1: 1: 1, the organic additive is fluoroethylene carbonate, vinylene carbonate and ethylene sulfate, and the mass ratio of fluoroethylene carbonate: vinylene carbonate: vinyl sulfate = 1: 15: 1, the organic additive accounts for 2-4% of the total mass of the electrolyte. Wherein the use of the organic additive is beneficial to forming a compact and stable solid electrolyte phase interface on the surface of the negative active material.
Further, the packaging shell material is an aluminum plastic film.
Further, the manufacturing method comprises the following steps:
(1) preparing anode slurry: taking NMP (N-methyl pyrrolidone) as a dispersing agent, weighing the components according to a formula, and uniformly stirring in vacuum stirring equipment to obtain anode slurry;
(2) preparing anode slurry: taking deionized water as a dispersing agent, weighing the components according to the formula, and uniformly stirring in vacuum stirring equipment to obtain cathode slurry;
(3) coating and flaking the positive electrode: coating the positive electrode slurry obtained in the step (1) on an aluminum foil with the thickness of 12-16 mu m, and rolling the pole piece after baking, wherein the rolling compaction density is 3.4 g/cm3~3.6g/cm3After rolling, welding the tabs to obtain a positive plate;
(4) coating and preparing a negative electrode: coating the negative electrode slurry obtained in the step (2) on copper foil with the thickness of 6-10 mu m, and rolling the pole piece after baking, wherein the rolling compaction density is 1.5 g/cm3~1.7g/cm3After rolling, welding a tab to obtain a negative plate;
(5) winding and packaging: winding the positive plate obtained in the step (3), the negative plate obtained in the step (4) and the double-sided ceramic coating isolation film on a winding machine, and performing top side sealing by using a nylon/aluminum/polypropylene aluminum-plastic film;
(6) baking the battery cell: placing the bare cell subjected to top side sealing in the step (5) in a vacuum oven, baking for 36-48 h at 80-85 ℃, and filling dry nitrogen in the midway to exchange gas so as to discharge water in the cell;
(7) injecting liquid and placing after injecting liquid: injecting electrolyte into the baked bare cell in the step (6), and standing the air bag for 24-36 h at 40-50 ℃ after pre-sealing to promote the electrolyte to fully infiltrate the pole piece and the diaphragm;
(8) high-temperature clamp formation: the battery core obtained after the liquid injection in the step (7) is placed on a high-temperature clamp formation cabinet for pressure formation, wherein the formation temperature is 40-50 ℃, the surface pressure applied to the surface of the battery core in the formation process is 0.4-0.6 MPa, the high-temperature formation is favorable for improving the fluidity and the conductivity of the electrolyte, the pressure formation is favorable for forming a thin, compact and stable solid electrolyte phase interface, and the first charge-discharge efficiency and the cycle performance are improved;
(9) laying aside and exhausting after formation: and (3) placing the battery cell airbag after formation in the step (8) upwards at 40-45 ℃ for 18-30 h, and then performing air exhaust and secondary sealing, wherein the electrolyte can be promoted to flow back when placed at high temperature after formation, and the liquid loss of the electrolyte is reduced.
The invention has the beneficial effects that: the specific capacity of the positive electrode material can be improved by selecting a high-voltage positive electrode material, the volume effect of the silicon carbon material in the charging and discharging process can be relieved while the specific capacity of the negative electrode material is improved by mixing a proper amount of the silicon carbon material with high specific capacity into graphite, a compact and stable solid electrolyte phase interface can be formed on the surface of a negative electrode active material by matching proper electrolyte, the liquid retention capacity and the safety performance of the battery can be improved by selecting a double-sided inorganic ceramic coating diaphragm, and the conductive capacity and the electrolyte retention capacity of positive and negative electrode plates can be improved by selecting a proper conductive agent combination. The lithium ion battery has the characteristics of high energy density and good cycle performance.
Detailed Description
The present invention will be further described with reference to specific embodiments, which are provided for illustrative and explanatory purposes only and should not be construed as limiting the scope of the present invention in any way.
Example 1:
(1) preparing anode slurry: using NMP (N-methyl pyrrolidone) as a dispersing agent, and 97.2 parts by weight of 4.35V high-voltage nickel cobalt lithium manganate 532 (LiNi)0.5Co0.2Mn0.3O2) Uniformly stirring 0.5 weight part of conductive graphite, 0.8 weight part of carbon nano tube and 1.5 weight parts of polyvinylidene fluoride in a vacuum stirring device to obtain anode slurry, wherein the selected 4.35V high-voltage nickel cobalt lithium manganate 532 ternary (LiNi) is adopted0.5Co0.2Mn0.3O2) The material has a single crystal structure, and has a D50 value of 6 μm and a specific surface area of 0.5m2The D50 of the selected conductive graphite is 4 mu m, and the specific surface area is 17m2The pipe diameter of the selected carbon nano tube is 5 nm-10 nm, the pipe length is 10 mu m-150 mu m, and the molecular weight of the selected polyvinylidene fluoride is 90 ten thousand-110 ten thousand;
(2) preparing anode slurry: using deionized water as a dispersing agent, and uniformly stirring 86.65 parts by weight of graphite, 8 parts by weight of pitch carbon-coated silica, 0.05 part by weight of carbon nano tube, 1.1 parts by weight of conductive carbon black, 1.5 parts by weight of sodium carboxymethyl cellulose and 2.7 parts by weight of styrene butadiene rubber in vacuum stirring equipment to obtain negative electrode slurry, wherein the selected graphite material is secondary particles, the D50 in the particle size distribution is 13 mu m, and the specific surface area is 1.8m2The mass percent of asphalt carbon in the selected asphalt carbon coated silica is 40 percent, the mass percent of the silica is 60 percent, the selected carbon nano tube is a single-walled carbon nano tube, the tube length is 1-200 mu m, the particle size distribution range of the selected conductive carbon black is 10-100 nm, and the specific surface area is 80m2/g；
(3) Coating and flaking the positive electrode: coating the positive electrode slurry obtained in the step (1) on an aluminum foil with the thickness of 14 mu m, and rolling the pole piece after baking, wherein the rolling compaction density is 3.45 g/cm3~3.50g/cm3After rolling, welding the tabs to obtain a positive plate;
(4) coating and preparing a negative electrode: coating the negative electrode slurry obtained in the step (2) on copper foil with the thickness of 8 mu m, and rolling the pole piece after baking, wherein the rolling compaction density is 1.60 g/cm3~1.65g/cm3After rolling, welding a tab to obtain a negative plate;
(5) winding and packaging: winding the positive plate obtained in the step (3), the negative plate obtained in the step (4) and the double-sided ceramic coating isolation film on a winding machine, wherein the winding machine comprises a winding machine bodyThe base film of the double-sided ceramic coating diaphragm is a polyethylene wet film, the thickness of the base film is 12 mu m, and the ceramic coating materials on the two sides of the base film are Al2O3(aluminum oxide), the thickness of the ceramic coating on both sides of the base film is 3 μm, and the top side sealing is carried out on the winding core by using a nylon/aluminum/polypropylene aluminum-plastic film after winding;
(6) baking the battery cell: placing the bare cell subjected to top side sealing in the step (5) in a vacuum oven, baking for 40h at 85 ℃, and filling dry nitrogen in the midway to exchange gas;
(7) injecting liquid and placing after injecting liquid: injecting electrolyte into the baked bare cell in the step (6), wherein the selected electrolyte contains lithium salt, organic solvent and organic additive, and the lithium salt is LiPF6(lithium hexafluorophosphate) in a concentration of 1mol/L, an organic solvent and a volume ratio thereof being EC (ethylene carbonate): EMC (ethyl methyl carbonate): DMC (dimethyl carbonate) = 1: 1: 1, the organic additive is fluoroethylene carbonate, vinylene carbonate and ethylene sulfate, and the mass ratio of fluoroethylene carbonate: vinylene carbonate: vinyl sulfate = 1: 15: 1, the organic additive accounts for 3 percent of the total mass of the electrolyte, and the pre-sealed air bag is placed for 28 hours at 45 ℃ after liquid injection;
(8) high-temperature clamp formation: carrying out pressure formation on the battery cell obtained after the liquid injection and placement in the step (7) on a high-temperature clamp formation cabinet, wherein the formation temperature is 40 ℃, and the surface pressure applied to the surface of the battery cell in the formation process is 0.5 MPa;
(9) laying aside and exhausting after formation: and (4) standing the cell airbag after the formation in the step (8) for 24 hours at 45 ℃ upwards, and then performing air exhaust and secondary sealing.
Example 2:
(1) preparing anode slurry: using NMP (N-methyl pyrrolidone) as a dispersing agent, and 97.5 parts by weight of 4.4V high-voltage nickel cobalt lithium manganate 532 (LiNi)0.5Co0.2Mn0.3O2) Uniformly stirring 0.5 weight part of conductive graphite, 0.8 weight part of carbon nano tube and 1.2 weight parts of polyvinylidene fluoride in a vacuum stirring device to obtain anode slurry, wherein the selected 4.4V high-voltage nickel cobalt lithium manganate 532 ternary (LiNi) is adopted0.5Co0.2Mn0.3O2) The material has a single crystal-like structure, the D50 is 5 μm, and the specific surface area is 0.6m2The D50 of the selected conductive graphite is 4 mu m, and the specific surface area is 19m2The pipe diameter of the selected carbon nano tube is 4 nm-8 nm, the pipe length is 10 mu m-150 mu m, and the molecular weight of the selected polyvinylidene fluoride is 90 ten thousand-110 ten thousand;
(2) preparing anode slurry: using deionized water as a dispersing agent, uniformly stirring 84.72 parts by weight of graphite, 10 parts by weight of pitch carbon-coated silica, 0.08 part by weight of carbon nano tube, 1.3 parts by weight of conductive carbon black, 1.4 parts by weight of sodium carboxymethyl cellulose and 2.5 parts by weight of styrene butadiene rubber in vacuum stirring equipment to obtain negative electrode slurry, wherein the selected graphite material is secondary particles, the D50 in the particle size distribution is 12 micrometers, and the specific surface area is 2.3m2The mass percent of asphalt carbon in the selected asphalt carbon coated silica is 50 percent, the mass percent of the silica is 50 percent, the selected carbon nano tube is a single-walled carbon nano tube, the tube length is 1-200 mu m, the particle size distribution range of the selected conductive carbon black is 10-100 nm, and the specific surface area is 90m2/g；
(3) Coating and flaking the positive electrode: coating the anode slurry obtained in the step (1) on an aluminum foil with the thickness of 15 mu m, and rolling the pole piece after baking, wherein the rolling compaction density is 3.50 g/cm3~3.55g/cm3After rolling, welding the tabs to obtain a positive plate;
(4) coating and preparing a negative electrode: coating the negative electrode slurry obtained in the step (2) on copper foil with the thickness of 7 mu m, and rolling the pole piece after baking, wherein the rolling compaction density is 1.60 g/cm3~1.65g/cm3After rolling, welding a tab to obtain a negative plate;
(5) winding and packaging: winding the positive plate obtained in the step (3), the negative plate obtained in the step (4) and the double-sided ceramic coating isolation film on a winding machine, wherein the selected base film of the double-sided ceramic coating diaphragm is a polyethylene wet film, the thickness of the base film is 9 mu m, and the ceramic coating materials on the two sides of the base film are ZrO2(zirconium dioxide), the thickness of the ceramic coating on both sides of the base film is 3 μm, and the roll core is topped by a nylon/aluminum/polypropylene aluminum-plastic film after windingSide sealing;
(6) baking the battery cell: placing the bare cell subjected to top side sealing in the step (5) in a vacuum oven, baking for 36 hours at 85 ℃, and filling dry nitrogen in midway to exchange gas;
(7) injecting liquid and placing after injecting liquid: injecting electrolyte into the baked bare cell in the step (6), wherein the selected electrolyte contains lithium salt, organic solvent and organic additive, and the lithium salt is LiPF6(lithium hexafluorophosphate) in a concentration of 1mol/L, an organic solvent and a volume ratio thereof being EC (ethylene carbonate): EMC (ethyl methyl carbonate): DMC (dimethyl carbonate) = 1: 1: 1, the organic additive is fluoroethylene carbonate, vinylene carbonate and ethylene sulfate, and the mass ratio of fluoroethylene carbonate: vinylene carbonate: vinyl sulfate = 1: 15: 1, the organic additive accounts for 4 percent of the total mass of the electrolyte, and the pre-sealed air bag is placed for 24 hours at 45 ℃ after liquid injection;
(8) high-temperature clamp formation: carrying out pressure formation on the battery cell obtained after the liquid injection and placement in the step (7) on a high-temperature clamp formation cabinet, wherein the formation temperature is 45 ℃, and the surface pressure applied to the surface of the battery cell in the formation process is 0.45 MPa;
(9) laying aside and exhausting after formation: and (4) standing the cell airbag after the formation in the step (8) upwards at 40 ℃ for 28h, and then performing air exhaust and secondary sealing.
Comparative example 1:
(1) preparing anode slurry: using NMP (N-methyl pyrrolidone) as a dispersing agent, and 97.2 parts by weight of 4.35V high-voltage nickel cobalt lithium manganate 532 (LiNi)0.5Co0.2Mn0.3O2) Uniformly stirring 0.5 weight part of conductive graphite, 0.8 weight part of carbon nano tube and 1.5 weight parts of polyvinylidene fluoride in a vacuum stirring device to obtain anode slurry, wherein the selected 4.35V high-voltage nickel cobalt lithium manganate 532 ternary (LiNi) is adopted0.5Co0.2Mn0.3O2) The material has a single crystal structure, and has a D50 value of 6 μm and a specific surface area of 0.5m2The D50 of the selected conductive graphite is 4 mu m, and the specific surface area is 17m2The pipe diameter of the selected carbon nano tube is 5 nm-10 nm, the pipe length is 10 mu m-150 mu m, and the molecular weight of the selected polyvinylidene fluoride is 90 ten thousand110 ten thousand;
(2) preparing anode slurry: using deionized water as a dispersing agent, and uniformly stirring 95.4 parts by weight of graphite, 1.1 parts by weight of conductive carbon black, 1.5 parts by weight of sodium carboxymethylcellulose and 2.0 parts by weight of styrene butadiene rubber in vacuum stirring equipment to obtain negative electrode slurry, wherein the selected graphite material is secondary particles, the D50 in the particle size distribution is 13 micrometers, and the specific surface area is 1.8m2The particle size distribution range of the selected conductive carbon black is 10 nm-100 nm, and the specific surface area is 80m2/g；
(3) Coating and flaking the positive electrode: coating the positive electrode slurry obtained in the step (1) on an aluminum foil with the thickness of 14 mu m, and rolling the pole piece after baking, wherein the rolling compaction density is 3.40 g/cm3~3.45g/cm3After rolling, welding the tabs to obtain a positive plate;
(4) coating and preparing a negative electrode: coating the negative electrode slurry obtained in the step (2) on copper foil with the thickness of 8 mu m, and rolling the pole piece after baking, wherein the rolling compaction density is 1.60 g/cm3~1.65g/cm3After rolling, welding a tab to obtain a negative plate;
(5) winding and packaging: winding the positive plate obtained in the step (3), the negative plate obtained in the step (4) and the single-sided ceramic coating isolation film on a winding machine, wherein the selected base film of the single-sided ceramic coating diaphragm is a polyethylene wet film, the thickness of the base film is 12 mu m, and the ceramic coating material on one side of the base film is Al2O3(aluminum oxide), the thickness of the ceramic coating material is 3 μm, the ceramic surface is contacted with the anode during winding, and the nylon/aluminum/polypropylene aluminum-plastic film is used for carrying out top side sealing on the winding core after winding;
(6) baking the battery cell: placing the bare cell subjected to top side sealing in the step (5) in a vacuum oven, baking for 40h at 85 ℃, and filling dry nitrogen in the midway to exchange gas;
(7) injecting liquid and placing after injecting liquid: injecting electrolyte into the baked bare cell in the step (6), wherein the selected electrolyte contains lithium salt and organic solvent, and the lithium salt is LiPF6(lithium hexafluorophosphate) in a concentration of 1mol/L, an organic solvent and a volume ratio thereof being EC (ethylene carbonate): EMC (Ethyl methyl carbonate)Ester): DMC (dimethyl carbonate) = 1: 1: 1, standing the pre-sealed air bag for 28 hours at 45 ℃ after liquid injection;
(8) high-temperature clamp formation: carrying out pressure formation on the battery cell obtained after the liquid injection and placement in the step (7) on a high-temperature clamp formation cabinet, wherein the formation temperature is 40 ℃, and the surface pressure applied to the surface of the battery cell in the formation process is 0.5 MPa;
(9) laying aside and exhausting after formation: and (4) standing the cell airbag after the formation in the step (8) for 24 hours at 45 ℃ upwards, and then performing air exhaust and secondary sealing.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.
Claims (7)
1. The polymer lithium ion battery is characterized by comprising a positive electrode, a negative electrode, an isolating membrane, electrolyte and a packaging shell.
2. The polymer lithium ion battery and the manufacturing method thereof according to claim 1, wherein the positive electrode comprises the following components in percentage by mass: high-voltage nickel cobalt lithium manganate 532 ternary (LiNi)0.5Co0.2Mn0.3O2) 96-98% of material, 0.4-0.8% of conductive graphite, 0.5-1.0% of carbon nano tube and 1.3-1.6% of polyvinylidene fluoride, wherein the high-voltage nickel cobalt lithium manganate 532 ternary material is of a single crystal or quasi-single crystal structure, the D50 is 4-8 mu m, and the specific surface area is 0.3m2/g~0.8m2The conductive graphite has D50 of 3-6 μm and a specific surface area of 10m2/g~22m2The diameter of the carbon nano tube is 3nm to 12nm, the length of the carbon nano tube is 1 mu m to 200 mu m, and the molecular weight of the polyvinylidene fluoride is 90 ten thousand to 110 ten thousand.
3. The polymer lithium ion battery of claim 1 and the method of making the sameCharacterized in that the negative electrode comprises the following components in percentage by mass: 82-89% of graphite, 6-12% of silicon carbon, 0.02-0.1% of carbon nano tube, 0.8-1.3% of conductive carbon black, 1.4-2.0% of sodium carboxymethyl cellulose and 2.3-3.0% of styrene butadiene rubber, wherein the graphite material is secondary particles, D50 in particle size distribution is 11-16 mu m, and the specific surface area is 1.2m2/g~2.5m2The silicon-carbon material is asphalt carbon-coated silica, wherein the mass percent of asphalt carbon is 30% -50%, the mass percent of silica is 70% -50%, the carbon nano tube is a single-walled carbon nano tube, the length of the single-walled carbon nano tube is 1-200 mu m, the particle size distribution range of the conductive carbon black is 10-100 nm, and the specific surface area of the conductive carbon black is 50m2/g~100m2/g。
4. The polymer lithium ion battery and the manufacturing method thereof according to claim 1, wherein the isolation membrane is a double-sided ceramic coating membrane, the base membrane is a polyethylene wet membrane, the thickness of the base membrane is 9-16 μm, and the coating materials on two sides of the base membrane are Al2O3(aluminum oxide), SiO2(silica), ZrO2(zirconium dioxide), Mg (OH)2And the thickness of the ceramic coating on the two sides of the base film is 2-5 mu m.
5. The polymer lithium ion battery and the manufacturing method thereof according to claim 1, wherein the electrolyte contains a lithium salt, an organic solvent and an organic additive, and the lithium salt is LiPF6(lithium hexafluorophosphate) in a concentration of 1mol/L, the organic solvent and the volume ratio thereof being EC (ethylene carbonate): EMC (ethyl methyl carbonate): DMC (dimethyl carbonate) = 1: 1: 1, the organic additive is fluoroethylene carbonate, vinylene carbonate and ethylene sulfate, and the mass ratio of fluoroethylene carbonate: vinylene carbonate: vinyl sulfate = 1: 15: 1, the organic additive accounts for 2-4% of the total mass of the electrolyte.
6. The polymer lithium ion battery and the manufacturing method thereof according to claim 1, wherein the packaging shell material is an aluminum plastic film.
7. The polymer lithium ion battery and the manufacturing method thereof according to claim 1, wherein the manufacturing method comprises the following steps:
(1) preparing anode slurry: taking NMP (N-methyl pyrrolidone) as a dispersing agent, weighing the components according to a formula, and uniformly stirring in vacuum stirring equipment to obtain anode slurry;
(2) preparing anode slurry: taking deionized water as a dispersing agent, weighing the components according to the formula, and uniformly stirring in vacuum stirring equipment to obtain cathode slurry;
(3) coating and flaking the positive electrode: coating the positive electrode slurry obtained in the step (1) on an aluminum foil with the thickness of 12-16 mu m, and rolling the pole piece after baking, wherein the rolling compaction density is 3.4 g/cm3~3.6g/cm3After rolling, welding the tabs to obtain a positive plate;
(4) coating and preparing a negative electrode: coating the negative electrode slurry obtained in the step (2) on copper foil with the thickness of 6-10 mu m, and rolling the pole piece after baking, wherein the rolling compaction density is 1.5 g/cm3~1.7g/cm3After rolling, welding a tab to obtain a negative plate;
(5) winding and packaging: winding the positive plate obtained in the step (3), the negative plate obtained in the step (4) and the double-sided ceramic coating isolation film on a winding machine, and performing top side sealing by using a nylon/aluminum/polypropylene aluminum-plastic film;
(6) baking the battery cell: placing the bare cell subjected to top side sealing in the step (5) in a vacuum oven, baking for 36-48 h at 80-85 ℃, and filling dry nitrogen in the midway to exchange gas;
(7) injecting liquid and placing after injecting liquid: injecting electrolyte into the baked bare cell in the step (6), and standing the air bag upwards for 24-36 h at 40-50 ℃ after pre-sealing;
(8) high-temperature clamp formation: carrying out pressure formation on the battery cell obtained after the liquid injection in the step (7) is placed on a high-temperature clamp formation cabinet, wherein the formation temperature is 40-50 ℃, and the surface pressure applied to the surface of the battery cell in the formation process is 0.4-0.6 MPa;
(9) laying aside and exhausting after formation: and (4) placing the battery cell airbag after the formation in the step (8) upwards at the temperature of 40-45 ℃ for 18-30 h, and then performing air exhaust and secondary sealing.
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