CN111628225A - Battery and preparation method thereof - Google Patents
Battery and preparation method thereof Download PDFInfo
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- CN111628225A CN111628225A CN202010633904.3A CN202010633904A CN111628225A CN 111628225 A CN111628225 A CN 111628225A CN 202010633904 A CN202010633904 A CN 202010633904A CN 111628225 A CN111628225 A CN 111628225A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 30
- 239000003792 electrolyte Substances 0.000 claims abstract description 188
- 239000000654 additive Substances 0.000 claims abstract description 92
- 230000000996 additive effect Effects 0.000 claims abstract description 78
- 239000007788 liquid Substances 0.000 claims abstract description 61
- 238000002347 injection Methods 0.000 claims abstract description 43
- 239000007924 injection Substances 0.000 claims abstract description 43
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 30
- 239000000203 mixture Substances 0.000 claims abstract description 28
- 238000004806 packaging method and process Methods 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims abstract description 8
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 35
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims description 35
- 239000002904 solvent Substances 0.000 claims description 35
- 229910001416 lithium ion Inorganic materials 0.000 claims description 28
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 27
- SJHAYVFVKRXMKG-UHFFFAOYSA-N 4-methyl-1,3,2-dioxathiolane 2-oxide Chemical compound CC1COS(=O)O1 SJHAYVFVKRXMKG-UHFFFAOYSA-N 0.000 claims description 26
- 230000014759 maintenance of location Effects 0.000 claims description 25
- 238000002156 mixing Methods 0.000 claims description 25
- 238000012360 testing method Methods 0.000 claims description 25
- 238000004519 manufacturing process Methods 0.000 claims description 22
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 claims description 21
- -1 LiODFB Chemical compound 0.000 claims description 19
- 238000010521 absorption reaction Methods 0.000 claims description 16
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 claims description 16
- 239000011555 saturated liquid Substances 0.000 claims description 16
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims description 15
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 13
- 229910052782 aluminium Inorganic materials 0.000 claims description 13
- 229910003002 lithium salt Inorganic materials 0.000 claims description 13
- 159000000002 lithium salts Chemical class 0.000 claims description 13
- 239000011230 binding agent Substances 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 12
- 239000006258 conductive agent Substances 0.000 claims description 12
- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical compound FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 claims description 10
- 238000005096 rolling process Methods 0.000 claims description 8
- 238000007731 hot pressing Methods 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 239000011889 copper foil Substances 0.000 claims description 6
- 239000011888 foil Substances 0.000 claims description 6
- 239000007774 positive electrode material Substances 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 6
- IGARGHRYKHJQSM-UHFFFAOYSA-N cyclohexylbenzene Chemical compound C1CCCCC1C1=CC=CC=C1 IGARGHRYKHJQSM-UHFFFAOYSA-N 0.000 claims description 5
- VEWLDLAARDMXSB-UHFFFAOYSA-N ethenyl sulfate;hydron Chemical compound OS(=O)(=O)OC=C VEWLDLAARDMXSB-UHFFFAOYSA-N 0.000 claims description 5
- 238000011068 loading method Methods 0.000 claims description 5
- 229910013188 LiBOB Inorganic materials 0.000 claims description 4
- 229910010942 LiFP6 Inorganic materials 0.000 claims description 4
- 229910010941 LiFSI Inorganic materials 0.000 claims description 4
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 4
- 229910003473 lithium bis(trifluoromethanesulfonyl)imide Inorganic materials 0.000 claims description 4
- 229910001486 lithium perchlorate Inorganic materials 0.000 claims description 4
- 229910001496 lithium tetrafluoroborate Inorganic materials 0.000 claims description 4
- VDVLPSWVDYJFRW-UHFFFAOYSA-N lithium;bis(fluorosulfonyl)azanide Chemical compound [Li+].FS(=O)(=O)[N-]S(F)(=O)=O VDVLPSWVDYJFRW-UHFFFAOYSA-N 0.000 claims description 4
- QSZMZKBZAYQGRS-UHFFFAOYSA-N lithium;bis(trifluoromethylsulfonyl)azanide Chemical compound [Li+].FC(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)F QSZMZKBZAYQGRS-UHFFFAOYSA-N 0.000 claims description 4
- 239000007773 negative electrode material Substances 0.000 claims description 4
- 239000003381 stabilizer Substances 0.000 claims description 3
- 239000011265 semifinished product Substances 0.000 claims description 2
- 230000008595 infiltration Effects 0.000 claims 1
- 238000001764 infiltration Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 5
- 230000000052 comparative effect Effects 0.000 description 24
- 229910013872 LiPF Inorganic materials 0.000 description 13
- 101150058243 Lipf gene Proteins 0.000 description 13
- 230000008569 process Effects 0.000 description 13
- 239000011259 mixed solution Substances 0.000 description 8
- 238000011056 performance test Methods 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- YPGMOWHXEQDBBV-IMJSIDKUSA-N (4R,5R)-1,2-dithiane-4,5-diol Chemical compound O[C@H]1CSSC[C@@H]1O YPGMOWHXEQDBBV-IMJSIDKUSA-N 0.000 description 6
- 239000013589 supplement Substances 0.000 description 5
- 239000006245 Carbon black Super-P Substances 0.000 description 4
- 239000006256 anode slurry Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000011267 electrode slurry Substances 0.000 description 4
- 230000010287 polarization Effects 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000013538 functional additive Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 230000001502 supplementing effect Effects 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- ZPFAVCIQZKRBGF-UHFFFAOYSA-N 1,3,2-dioxathiolane 2,2-dioxide Chemical group O=S1(=O)OCCO1 ZPFAVCIQZKRBGF-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009783 overcharge test Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
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
- H01M10/058—Construction or manufacture
-
- 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
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
-
- 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)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Inorganic Chemistry (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a battery and a preparation method thereof. The method comprises the following steps: 1) packaging the battery core and the shell, and then carrying out primary liquid injection by using an electrolyte A, and carrying out negative pressure formation or clamp formation to obtain a semi-finished battery; 2) carrying out secondary liquid injection on the electrolyte B for the semi-finished battery, and sealing and packaging to obtain the battery; the electrolyte a and the electrolyte B have different compositions. In the method provided by the invention, the formula compositions of the electrolyte A and the electrolyte B are not consistent, wherein the electrolyte A can be properly added with a first additive aiming at forming a more stable SEI film, and the electrolyte B can be pertinently added with a second additive according to the performance difference of a battery material system or the actual use of a battery. The battery provided by the invention has excellent performance.
Description
Technical Field
The invention belongs to the technical field of batteries, and relates to a battery and a preparation method thereof.
Background
With the progress of science and technology, the application of the lithium ion battery in life is more and more extensive; the existence of the energy storage device can be found in various fields from small household appliances to new energy automobiles to large energy storage vehicles.
The electrolyte is 'blood' of lithium ion battery, Li+The electrolyte is repeatedly released and inserted between the anode and the cathode, and key performances of the battery, such as safety, high and low temperature performances, power performance and the like, are influenced. The electrolyte is generally composed of a solvent, lithium salt and an additive according to a certain proportion, and the components are different according to different electrical property requirements, the electrolyte is consumed in the using process of the battery, particularly the battery with long cycle life has more liquid retaining amount, so that the consumption of the electrolyte in the cycle process is met. Along with the improvement of the energy density of the battery, the capacity of the single battery is larger and larger, the porosity of the pole piece is smaller and smaller, the wettability of the battery is poor, and the liquid retention capacity of the battery is also influenced.
Therefore, at present, a negative pressure or clamp formation process and a secondary liquid supplementing process are adopted for manufacturing a square aluminum shell to ensure the liquid retention amount of the battery, mainly because in the battery formation process, an additive is reduced and an SEI film (solid electrolyte interface film) is formed on a negative electrode, a large amount of gas is generated in the process, and if the gas is not completely removed, the gas is left in the battery, so that the problems of untight adhesion of positive and negative electrode interfaces, great loss of battery performance, difficulty in controlling battery thickness and the like are caused; therefore, negative pressure or clamp formation is adopted, gas generated by formation is discharged in time, but if too much electrolyte is injected in one-time liquid injection, free electrolyte can be extracted out or extruded out along with the negative pressure during the negative pressure or clamp formation; on the other hand, if too little electrolyte is injected in one-time injection, the electrolyte is not enough to infiltrate the battery core inside the battery, and a compact SEI film is not formed on the corresponding negative electrode in the area where the electrolyte is deficient during formation, so that the performance of the battery is seriously influenced. Therefore, secondary liquid injection is carried out after the battery is formed to supplement the electrolyte, and the electrolyte formulas used for the primary liquid injection and the secondary liquid injection are unified; the difference is that each lithium ion battery manufacturer has a slight difference in the formula of the electrolyte according to different products or different application directions of the products.
Nowadays, for LFP batteries, the development of low-temperature and high-temperature compatible electrolytes is urgently needed; the problem of high-safety electrolyte for NCM batteries has been a serious problem. The common method is to add functional additives to improve the performance of the battery, but as the electrolyte amount added in one-time injection is large, the functional additives may generate electrochemical reaction during formation and participate in the formation of SEI film at the negative electrode to be consumed, so that the impedance of the battery is increased and the performance of the battery is influenced; on the other hand, the small amount of functional additive contained in the secondary injection is not enough to play an effective role; if the proportion of the additive is increased in the electrolyte, the more the additive is consumed by the film formation, the higher the battery impedance becomes, which is disadvantageous in the battery performance.
CN109273663A discloses a battery liquid injection method, which comprises: (1) injecting electrolyte into a battery to be treated to obtain an injected battery, performing negative pressure standing pretreatment on the injected battery, performing positive pressure standing pretreatment after exhausting to normal pressure, and obtaining a pretreated battery after exhausting to normal pressure; (2) standing the pretreated battery under negative pressure, then discharging gas to normal pressure, standing under positive pressure, and finishing a differential pressure treatment cycle after discharging gas to normal pressure; (3) repeating the pressure difference treatment cycle of the step (2) for at least 1 time to obtain a circularly treated battery; (4) and (4) carrying out negative pressure standing post-treatment on the circularly treated battery, and exhausting to normal pressure to obtain the battery with finished liquid injection. However, this method needs to be further improved in terms of reducing the impedance and polarization of the battery.
Disclosure of Invention
In view of the above-mentioned shortcomings in the prior art, the present invention is directed to a battery and a method for manufacturing the same. The preparation method provided by the invention can effectively improve the performance of the lithium ion battery.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a method of making a battery, the method comprising the steps of:
(1) packaging the battery core and the shell, then carrying out primary liquid injection by using an electrolyte A, and forming by negative pressure or a clamp to obtain a semi-finished battery;
(2) carrying out secondary liquid injection on the electrolyte B for the semi-finished battery in the step (1), and sealing and packaging to obtain the battery;
wherein the electrolyte A in the step (1) and the electrolyte B in the step (2) have different compositions.
In the preparation method provided by the invention, the formulations of the electrolyte A and the electrolyte B are different, wherein the electrolyte A can be properly added with a first additive aiming at forming a more stable SEI film, and the electrolyte B can be purposefully added with different additives such as a low-impedance additive, a high-temperature additive, an overcharge-preventing additive, a stabilizer and the like according to the performance difference of a battery material system or the actual use of a battery. The formula composition of the electrolyte A and the formula composition of the electrolyte B are different, so that the preparation method provided by the invention is more flexible, and the formula of the electrolyte is adjusted according to the requirement, thereby achieving the purpose of improving the performance of the battery.
In the invention, the formula compositions of the electrolyte A and the electrolyte B are not consistent, and different formulas can be used in a targeted manner according to the battery material system or the battery performance difference, generally, the electrolyte A contains a first additive, the second additive can contain or not, the electrolyte A is not limited to only contain the first additive and not contain the second additive, and the electrolyte B is also not limited to only contain the second additive and not contain the first additive.
The preparation method provided by the invention is simple to operate, convenient to produce, and suitable for lithium ion batteries of different systems and different models, especially square aluminum shell batteries.
The following is a preferred technical solution of the present invention, but not a limitation to the technical solution provided by the present invention, and the technical objects and advantageous effects of the present invention can be better achieved and achieved by the following preferred technical solution.
As a preferable technical solution of the present invention, the battery includes a lithium ion battery.
Preferably, the battery is a prismatic aluminum can battery.
Preferably, in the preparation method, the total liquid retaining amount of the battery consists of the electrolyte A and the electrolyte B, the mass of the electrolyte A accounts for 75-95%, such as 75%, 80%, 85%, 90% or 95% of the total liquid retaining amount of the battery, and the mass of the electrolyte B accounts for 5-25%, such as 5%, 10%, 15% or 20% of the total liquid retaining amount of the battery.
In the invention, the amount of the electrolyte A in the primary injection can ensure that the battery core is completely soaked by the electrolyte, a compact SEI film can be formed on a negative electrode during formation, and excessive free electrolyte is prevented from being pumped out by negative pressure during formation. The amount of the electrolyte B in the secondary injection can supplement enough free electrolyte to meet the consumption of the electrolyte in the use process of the battery.
Preferably, in the step (1), the injection amount of the electrolyte a is greater than the saturated liquid absorption amount of the battery core. Thus, the battery core can be ensured to be completely soaked by the electrolyte.
As a preferred embodiment of the present invention, the electrolyte a in step (1) includes a lithium salt, a first additive, and a solvent. The first additive in the electrolyte a is effective in forming an SEI film.
In the present invention, "first" and "second" are merely differences in names, and do not limit the number.
Preferably, the lithium salt comprises LiFP6、LiClO4LiBOB, LiFSI, LiODFB, LiTFSI or LiBF4Any one or a combination of at least two of them.
Preferably, the first additive comprises any one of vinylene carbonate, propylene sulfite or fluoroethylene carbonate or a combination of at least two of the vinylene carbonate, the propylene sulfite or the fluoroethylene carbonate.
Preferably, the mass fraction of the first additive in the electrolyte a is 1-15%, such as 1%, 5%, 10%, or 15%.
Preferably, the solvent comprises any one of ethylene carbonate, ethyl methyl carbonate, propylene carbonate, dimethyl carbonate or diethyl carbonate or a combination of at least two thereof.
As a preferred embodiment of the present invention, the electrolyte B in step (2) includes a lithium salt, a second additive, and a solvent. The second additive in the electrolyte B can ensure that the battery has required performance in actual use, and meanwhile, the electrolyte B does not participate in formation of a film, so that the impedance of the battery can be effectively reduced, and the polarization of the battery is reduced.
Preferably, the lithium salt comprises LiFP6、LiClO4LiBOB, LiFSI, LiODFB, LiTFSI or LiBF4Any one or a combination of at least two of them.
Preferably, the second additive comprises any one of or a combination of at least two of a low impedance additive, a high temperature additive, an anti-overcharge additive or a stabilizer.
Preferably, the second additive comprises any one of or a combination of at least two of propylene sulfite, phenylcyclohexane or vinyl sulfate. In the second additive, the propylene sulfite serves as a first additive and a high-temperature additive of the negative electrode; the phenylcyclohexane is used as a positive electrode protection additive; vinyl sulfate acts as a high temperature additive.
Preferably, the mass fraction of the second additive in the electrolyte B is 0.5-10%, such as 0.5%, 1%, 2%, 5%, 8%, or 10%.
Preferably, the solvent comprises any one of ethylene carbonate, ethyl methyl carbonate, propylene carbonate, dimethyl carbonate or diethyl carbonate or a combination of at least two thereof.
As a preferable technical solution of the present invention, the encapsulating in step (1) includes loading the battery cell into a casing and baking.
Preferably, step (1) further comprises: and standing and infiltrating before the negative pressure or clamp formation, and standing after the negative pressure or clamp formation.
As a preferable embodiment of the present invention, the step (2) further comprises: after the hermetic package, a capacity test was performed.
As a preferable technical scheme of the invention, the battery cell in the step (1) is subjected to a saturated liquid absorption test before being packaged with the shell.
As a preferable technical scheme of the invention, the preparation method of the battery cell in the step (1) comprises the following steps: and mixing and homogenizing the positive active material, the conductive agent and the binder, coating the mixture on an aluminum foil, mixing and homogenizing the negative active material, the conductive agent and the binder, coating the mixture on a copper foil, and performing rolling, flaking, winding, hot pressing and short circuit testing to obtain the battery core.
As a further preferred technical solution of the method of the present invention, the method comprises the steps of:
(1) mixing and homogenizing a positive active material, a conductive agent and a binder, coating the mixture on an aluminum foil, mixing and homogenizing a negative active material, a conductive agent and a binder, coating the mixture on a copper foil, and performing rolling, flaking, winding, hot pressing and short circuit testing to obtain a battery core;
(2) carrying out a saturated liquid absorption test on the battery cell in the step (1);
(3) putting the battery core of the battery core in the step (1) into a shell, baking, performing primary liquid injection by using an electrolyte A, standing and infiltrating, forming by using a negative pressure or a clamp, and standing to obtain a semi-finished battery;
(4) carrying out secondary liquid injection on the electrolyte B for the semi-finished product battery in the step (3), sealing and packaging to obtain the battery, and carrying out capacity test on the battery;
wherein the electrolyte A in the step (3) and the electrolyte B in the step (4) have different compositions; the electrolyte A comprises a lithium salt, a first additive and a solvent; the electrolyte B includes a lithium salt, a second additive, and a solvent:
in the preparation method, the total liquid retention of the battery consists of electrolyte A and electrolyte B, wherein the mass of the electrolyte A accounts for 75-95% of the total liquid retention of the battery, and the mass of the electrolyte B accounts for 5-25% of the total liquid retention of the battery; and the injection amount of the electrolyte A is greater than the saturated liquid absorption amount of the battery core.
In a second aspect, the present invention provides a battery prepared by the preparation method of the first aspect.
Compared with the prior art, the invention has the following beneficial effects:
(1) in the preparation method provided by the invention, a method of injecting the electrolyte A for the first time and injecting the electrolyte B for the second time is adopted, and the first additive injected into the electrolyte A for the first time can effectively form an SEI film during formation; electrolyte B is injected for the second time, the performance of the battery in practical use can be guaranteed by the second additive in the electrolyte B, meanwhile, the electrolyte B does not participate in formation of a film, the impedance of the battery can be effectively reduced, and the polarization of the battery is reduced.
(2) In the preparation method provided by the invention, the amount of the electrolyte A injected once accounts for 75-95% of the total liquid retention amount, and the amount injected once is larger than the saturated liquid absorption amount of the battery cell, so that the battery cell can be ensured to be completely soaked by the electrolyte, a compact SEI film can be formed on a negative electrode during formation, and excessive free electrolyte is prevented from being extracted by negative pressure during formation.
(3) In the method provided by the invention, the formula compositions of the electrolyte A and the electrolyte B are not consistent, wherein the electrolyte A can be properly added with a first additive aiming at forming a more stable SEI film, and the electrolyte B can be pertinently added with a second additive according to the performance difference of a battery material system or the actual use of a battery.
(4) The preparation method provided by the invention has the advantages of simple process, low production cost and less waste liquid, and is suitable for industrial production. The battery (especially the lithium ion battery) provided by the invention has excellent performance.
Drawings
Fig. 1 is a schematic process flow diagram of a preparation method of a lithium ion battery provided in example 1;
fig. 2 is a schematic external view of a cell in example 1;
fig. 3 is a schematic external view of a cell in example 2;
fig. 4 is a graph of cycle data for the batteries provided in example 2 and comparative example 2;
fig. 5 is a graph of the cycle temperatures of the batteries provided in example 2 and comparative example 2.
Detailed Description
In order to better illustrate the present invention and facilitate the understanding of the technical solutions of the present invention, the present invention is further described in detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
The following are typical but non-limiting examples of the invention:
example 1
This example prepares a lithium ion battery as follows:
(1) manufacturing a positive plate: LFP is taken as a positive electrode active material, and the mixture of the LFP, a binder PVDF and a conductive agent Super-P is mixed according to the mixing ratio of 96.5: 2.0: 1.5, uniformly mixing and stirring the mixture in NMP to prepare anode slurry, coating the two sides of the anode slurry on aluminum foil according to a set surface density, and rolling and flaking to form an anode sheet;
(2) and (3) manufacturing a negative plate: graphite, a conductive agent Super-P, a thickening agent CMC and a binder SBR are mixed according to the weight ratio of 96.0: 1.0: 1.2: 1.8, uniformly mixing and stirring in deionized water to prepare negative electrode slurry, coating the two sides of the negative electrode slurry on copper foil according to a set surface density, and rolling and tabletting to form a negative electrode sheet;
(3) manufacturing of the battery cell: winding the obtained positive plate, negative plate and diaphragm to obtain a battery cell, carrying out hot pressing and short circuit testing, then loading the battery cell into an aluminum shell through processes such as welding and baking;
(4) preparing electrolyte A: mixing lithium hexafluorophosphate (LiPF)6) Adding the mixture into a solvent, adding an additive, and uniformly mixing to obtain an electrolyte A, wherein the solvent is a mixed solution of Ethylene Carbonate (EC), Propylene Carbonate (PC) and Ethyl Methyl Carbonate (EMC), the mass ratio of EC, PC and EMC in the solvent is EC: PC: EMC 30:5:65, the additive is Vinylene Carbonate (VC) and Propylene Sulfite (PS), the mass ratio of VC: PS of the additive to PS is 3:2, and lithium hexafluorophosphate (LiPF) in the obtained electrolyte A is obtained6) The concentration of (A) is 1.0 mol/L; in the electrolyte A, the total mass fraction of the additive is 5%.
(5) Preparation of electrolyte B: mixing lithium hexafluorophosphate (LiPF)6) Adding the mixture into a solvent, adding an additive, and uniformly mixing to obtain an electrolyte B, wherein the solvent is a mixed solution of Ethylene Carbonate (EC) and Ethyl Methyl Carbonate (EMC), the mass ratio of EC to EMC in the solvent is EC: EMC 3:7, the additive is Vinylene Carbonate (VC), Propylene Sulfite (PS) and vinyl sulfate (DTD), the mass ratio of PS: DTD of the additive to VC, PS and DTD is 8:1:1, and lithium hexafluorophosphate (lithium hexafluorophosphate) in the obtained electrolyte B is obtainedLiPF6) The concentration of (A) is 1.1 mol/L; in the electrolyte B, the total mass fraction of the additive is 10%.
(6) Manufacturing the battery: and (3) performing primary liquid injection on the battery cell baked in the step (3), injecting electrolyte A (larger than the saturated liquid absorption amount of the battery cell) accounting for 85% of the total liquid retention amount by mass, standing at normal temperature for 24 hours, performing negative pressure or clamp formation, standing at 45 ℃ for 24 hours, performing secondary liquid supplement, injecting electrolyte B accounting for 15% of the total liquid retention amount by mass, sealing, performing capacity test and OCV test, and packaging to obtain the lithium ion battery of the embodiment 1.
Fig. 1 is a schematic process flow diagram of a preparation method of a lithium ion battery provided in this embodiment.
Fig. 2 is an appearance schematic diagram of the battery cell prepared in step (3) of this embodiment.
The performance test results of the lithium ion battery prepared in this example are shown in table 1.
Example 2
This example prepares a lithium ion battery as follows:
(1) manufacturing a positive plate: the proportion of NCM positive electrode active material, binder PVDF and conductive agent Super-P is 6:2:2, according to 97.5: 1.0: 1.5, uniformly mixing and stirring the mixture in NMP to prepare anode slurry, coating the two sides of the anode slurry on aluminum foil according to a set surface density, and rolling and flaking to form an anode sheet;
(2) and (3) manufacturing a negative plate: graphite, a conductive agent Super-P, a thickening agent CMC and a binder SBR are mixed according to the weight ratio of 96.5: 0.8: 1.2: 1.5, uniformly mixing and stirring in deionized water to prepare negative electrode slurry, coating the two sides of the negative electrode slurry on copper foil according to a set surface density, and rolling and tabletting to form a negative electrode sheet;
(3) manufacturing of the battery cell: laminating the obtained positive plate, the obtained negative plate and the diaphragm to obtain a battery cell, carrying out hot pressing and short circuit testing, and then loading the battery cell into an aluminum shell through processes such as welding and baking;
(4) preparing electrolyte A: mixing lithium hexafluorophosphate (LiPF)6) Adding the electrolyte A into a solvent, adding an additive, and uniformly mixing to obtain an electrolyte A, wherein the solvent isThe electrolyte is a mixed solution of Ethylene Carbonate (EC), diethyl carbonate (DEC) and Ethyl Methyl Carbonate (EMC), the mass ratio EC, DEC and EMC in the solvent is 30:5:65, the additives are Vinylene Carbonate (VC), Propylene Sulfite (PS) and fluoroethylene carbonate (FEC), the mass ratio VC, PS and FEC in the additives are 3:1:1, and lithium hexafluorophosphate (LiPF) in the electrolyte A is obtained6) The concentration of (A) is 1 mol/L; in the electrolyte A, the total mass fraction of the additive is 5%.
(5) Preparation of electrolyte B: mixing lithium hexafluorophosphate (LiPF)6) Adding the mixture into a solvent, adding an additive, and uniformly mixing to obtain an electrolyte B, wherein the solvent is a mixed solution of Ethylene Carbonate (EC), diethyl carbonate (DEC) and Ethyl Methyl Carbonate (EMC), the mass ratio of EC, DEC and EMC in the solvent is EC: DEC: EMC ═ 30:5:65, the additive is Propylene Sulfite (PS) and phenylcyclohexane (CHB), the mass ratio of PS: CHB ═ 1:1 of the additive to CHB, and lithium hexafluorophosphate (LiPF) in the obtained electrolyte B is obtained6) The concentration of (A) is 1 mol/L; in the electrolyte B, the total mass fraction of the additive is 2%.
(6) Manufacturing the battery: and (3) performing primary liquid injection on the battery cell baked in the step (3), injecting an electrolyte A (larger than the saturated liquid absorption capacity of the battery cell) accounting for 80 mass percent of the total liquid retention capacity, standing at normal temperature for 24 hours, performing negative pressure or clamp formation, standing at 45 ℃ for 24 hours, performing secondary liquid supplement, injecting an electrolyte B accounting for 20 mass percent of the total liquid retention capacity, sealing, performing capacity test and OCV test, and packaging to obtain the lithium ion battery of the embodiment 2.
Fig. 3 is an appearance schematic diagram of the battery cell prepared in step (3) of this embodiment.
The performance test results of the lithium ion battery prepared in this example are shown in table 1.
Example 3
This example prepares a lithium ion battery as follows:
(1) manufacturing of the battery cell: winding the positive plate same as the positive plate in the embodiment 1, the negative plate same as the negative plate in the embodiment 1 and the diaphragm to obtain a battery cell, carrying out hot pressing and short circuit tests, then loading the battery cell into an aluminum shell through processes such as welding and baking; and testing the saturated liquid absorption amount of the battery cell.
(2) Preparing electrolyte A: mixing lithium hexafluorophosphate (LiPF)6) Adding the mixture into a solvent, adding an additive, and uniformly mixing to obtain an electrolyte A, wherein the solvent is a mixed solution of Ethylene Carbonate (EC), Propylene Carbonate (PC) and Ethyl Methyl Carbonate (EMC), the mass ratio of EC, PC and EMC in the solvent is EC: PC: EMC ═ 30:5:65, the additive is Vinylene Carbonate (VC), and lithium hexafluorophosphate (LiPF) in the obtained electrolyte A is obtained6) The concentration of (A) is 1.0 mol/L; in the electrolyte A, the total mass fraction of the additive is 3%.
(3) Preparation of electrolyte B: mixing lithium hexafluorophosphate (LiPF)6) Adding the mixture into a solvent, adding an additive, and uniformly mixing to obtain an electrolyte B, wherein the solvent is a mixed solution of Ethylene Carbonate (EC) and Ethyl Methyl Carbonate (EMC), the mass ratio of EC to EMC in the solvent is EC: EMC ═ 3:7, the additive is ethylene sulfate (DTD), and lithium hexafluorophosphate (LiPF) in the electrolyte B is obtained6) The concentration of (A) is 1.1 mol/L; in the electrolyte B, the total mass fraction of the additive is 1%.
(4) Manufacturing the battery: and (3) injecting the baked battery core in the step (3) for the first time, injecting electrolyte A accounting for 90 mass percent of the total liquid retention amount, wherein the injection amount of the electrolyte A is larger than the saturated liquid absorption amount of the battery core, standing at normal temperature for 24 hours, then performing negative pressure or clamp formation, standing at 45 ℃ for 24 hours, performing secondary liquid supplement, injecting electrolyte B accounting for 10 mass percent of the total liquid retention amount, sealing, performing capacity test and OCV test, and packaging to obtain the lithium ion battery of the embodiment 1.
The performance test results of the lithium ion battery prepared in this example are shown in table 1.
Example 4
The lithium ion battery preparation method provided in this example is the same as example 1 except that in step (6), the first injection is performed to inject the electrolyte a (smaller than the saturated liquid absorption of the battery cell) accounting for 70% by mass of the total liquid retention amount, and the second injection is performed to inject the electrolyte B accounting for 30% by mass of the total liquid retention amount.
The performance test results of the lithium ion battery prepared in this example are shown in table 1.
Example 5
The preparation method of the lithium ion battery provided in this embodiment is the same as that of embodiment 1 except that in step (6), the first injection is performed to inject the electrolyte a (larger than the saturated liquid absorption amount of the battery cell) accounting for 98% by mass of the total liquid retention amount, and the second injection is performed to inject the electrolyte B accounting for 2% by mass of the total liquid retention amount.
The performance test results of the lithium ion battery prepared in this example are shown in table 1.
Comparative example 1
This comparative example a method of making a lithium ion battery is referenced to example 1, except that: in the electrolyte a prepared in the step (4) of the comparative example, the solvent is a mixed solution of Ethylene Carbonate (EC), Propylene Carbonate (PC) and Ethyl Methyl Carbonate (EMC), and the mass ratio of EC, PC and EMC in the solvent is EC: PC: EMC of 30:5: 65; lithium hexafluorophosphate (LiPF) in the electrolyte A6) The concentration of (A) is 1.0 mol/L; in the electrolyte A, additives are Vinylene Carbonate (VC), Propylene Sulfite (PS) and vinyl sulfate (DTD), the mass ratio of the additives VC to the additives PS to the additives DTD is 4:2:1, and the total mass fraction of the additives in the electrolyte A is 7%; the operation of the step (5) is not carried out, and the electrolyte A accounting for 15% of the total liquid retention amount is injected by the secondary liquid supplementing in the step (6). The other operations were the same as in example 1.
The results of the performance tests of the lithium ion batteries prepared in this comparative example are shown in table 1.
Comparative example 2
This comparative example a method of making a lithium ion battery is referenced to example 2, except that: in the electrolyte a prepared in step (4) of this comparative example, the solvent was a mixed solution of Ethylene Carbonate (EC), diethyl carbonate (DEC) and Ethyl Methyl Carbonate (EMC), the mass ratio of EC, DEC and EMC in the solvent was EC: DEC: EMC ═ 30:5:65, and lithium hexafluorophosphate (LiPF) in the electrolyte a was prepared6) The concentration of (A) is 1.0 mol/L; in the electrolyte A, additives are Vinylene Carbonate (VC), Propylene Sulfite (PS), fluoroethylene carbonate (FEC) and phenylcyclohexane (CHB), the mass ratio of the additives VC to the additives to the FEC to the CHB is 3:1.5:1:1, and in the electrolyte A, the additives to the electrolyte A areThe total mass fraction of (a) is 6.5%; the operation of the step (5) is not carried out, and the electrolyte A accounting for 20 mass percent of the total liquid retaining amount is injected by the secondary liquid supplementing in the step (6). The other operations were the same as in example 1.
Fig. 4 is a graph of cycle data of the batteries provided in example 1 and comparative example 1, and it can be seen from the graph that the batteries manufactured by the method of the present invention were cycled at 50 ± 3 ℃ and the number of cycles was increased by about 555 when the capacity was decreased to 80% as compared to the batteries manufactured by the conventional method.
Fig. 5 is a graph of the cycle temperatures of the batteries provided in example 1 and comparative example 1, from which it can be seen that the actual cycle temperatures of example 1 and comparative example 1 are both within the range of 50 ± 3 ℃, and the temperature of example 1 is slightly higher than that of comparative example 1.
The results of the performance tests of the lithium ion batteries prepared in this comparative example are shown in table 1.
The test method comprises the following steps:
the batteries provided by the examples and the comparative examples are respectively charged at a constant current and a constant voltage of 1C in a high-temperature box at 50 +/-3 ℃, are stood for 30min, are discharged at a constant current of 1C again, are stood for 30min for cyclic test, are stopped when the capacity retention rate is reduced to 80 percent, and are recorded in the number of cycles.
And testing the internal resistance by adopting a daily BTS3562 voltage internal resistance tester at the temperature of 25 ℃.
Overcharge reliability was tested using a novice 5V300A instrument at 25 ℃.
The results of the above tests are shown in Table 1.
TABLE 1
It can be seen from a combination of the examples and comparative examples that, in the preparation methods provided in examples 1 to 3, by using the method of injecting the electrolyte a once and injecting the electrolyte B twice, the first additive injected into the electrolyte a once is effective in forming the SEI film; electrolyte B is injected for the second time, the performance of the battery in practical use can be guaranteed by the second additive in the electrolyte B, and meanwhile, the electrolyte B does not participate in formation film forming, so that the impedance of the battery can be effectively reduced, and the polarization of the battery is reduced; the amount of the electrolyte A for primary liquid injection accounts for 75-95% of the total liquid retention amount, and the primary liquid injection amount is larger than the saturated liquid absorption amount of the battery cell, so that the battery cell can be ensured to be completely soaked by the electrolyte, a compact SEI film can be formed on a negative electrode during formation, and excessive free electrolyte is prevented from being extracted by negative pressure during formation; the formula compositions of the electrolyte A and the electrolyte B are different, wherein the electrolyte A can be properly added with a first additive aiming at forming a more stable SEI film, and the electrolyte B can be purposefully added with a second different additive according to the performance difference of a battery material system or the actual use of a battery. Thus, the batteries provided in examples 1 to 3 had excellent high-temperature cycle performance, lower internal resistance and better battery reliability.
In the preparation method of example 4, the electrolyte a added in the primary injection accounts for 70% of the total liquid retaining amount, and is not enough to completely infiltrate the battery, so that a complete and stable SEI film is not formed on the surface of the negative electrode during formation, and the electrolyte B added in the secondary injection accounts for 30% of the total liquid retaining amount, and at the initial stage of the cycle, the surface of the negative electrode continues to form a film, and active lithium is consumed, so that the internal resistance of the battery is increased, and the capacity is rapidly attenuated, so that the cycle performance is reduced.
In the preparation method of example 5, the electrolyte a added in the primary injection accounts for 98% of the total liquid retaining amount, the electrolyte B added in the secondary injection accounts for 2% of the total liquid retaining amount, the primary injection amount is too large, although the battery is sufficiently infiltrated, a stable SEI film can be formed on the negative electrode during formation, because the primary injection amount is too large, the redundant electrolyte is drawn out along with negative pressure or extruded by a clamp during formation, the amount of the electrolyte B added in the secondary injection only accounts for 2% of the total liquid retaining amount, the amount of free electrolyte is too small, and the circulation performance is reduced due to insufficient electrolyte in the later period of circulation.
Comparative example 1 the total amount of electrolyte added was the same as in example 1, but the electrolyte components used in the two-time injection of comparative example 1 were the same, and although the additives of the electrolyte a and the electrolyte B of example 1 were included in the two-time added electrolytes of comparative example 1, the effects were inferior to those of example 1, resulting in a shorter cycle life of comparative example 1 than that of example.
Comparative example 2 compared with example 2, the total amount of the added electrolyte is the same, but the electrolyte components used in the two times of injection in comparative example 1 are the same, and although the overcharge prevention additives of the electrolyte a and the electrolyte B in example 2 are contained in the two times of addition in the electrolyte in comparative example 2, a part of the overcharge prevention additive in comparative example 2 is consumed in film formation during formation, so that the effect is weakened, and the problem of fire is caused in the overcharge test.
The applicant states that the present invention is illustrated in detail by the above examples, but the present invention is not limited to the above detailed methods, i.e. it is not meant that the present invention must rely on the above detailed methods for its implementation. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. A method of making a battery, comprising the steps of:
(1) packaging the battery core and the shell, and then carrying out primary liquid injection by using an electrolyte A, and carrying out negative pressure formation or clamp formation to obtain a semi-finished battery;
(2) carrying out secondary liquid injection on the electrolyte B for the semi-finished battery in the step (1), and sealing and packaging to obtain the battery;
wherein the electrolyte A in the step (1) and the electrolyte B in the step (2) have different compositions.
2. The method of manufacturing according to claim 1, wherein the battery comprises a lithium ion battery;
preferably, the battery is a prismatic aluminum can battery;
preferably, in the preparation method, the total liquid retention of the battery consists of electrolyte A and electrolyte B, wherein the mass of the electrolyte A accounts for 75-95% of the total liquid retention of the battery, and the mass of the electrolyte B accounts for 5-25% of the total liquid retention of the battery;
preferably, in the step (1), the injection amount of the electrolyte a is greater than the saturated liquid absorption amount of the battery core.
3. The production method according to claim 1 or 2, wherein the electrolyte a of step (1) comprises a lithium salt, a first additive and a solvent;
preferably, the lithium salt comprises LiFP6、LiClO4LiBOB, LiFSI, LiODFB, LiTFSI or LiBF4Any one or a combination of at least two of them;
preferably, the first additive comprises any one of vinylene carbonate, propylene sulfite or fluoroethylene carbonate or a combination of at least two of vinylene carbonate, propylene sulfite and fluoroethylene carbonate;
preferably, in the electrolyte A, the mass fraction of the first additive is 1-15%;
preferably, the solvent comprises any one of ethylene carbonate, ethyl methyl carbonate, propylene carbonate, dimethyl carbonate or diethyl carbonate or a combination of at least two thereof.
4. The production method according to any one of claims 1 to 3, wherein the electrolyte B of step (2) comprises a lithium salt, a second additive and a solvent:
preferably, the lithium salt comprises LiFP6、LiClO4LiBOB, LiFSI, LiODFB, LiTFSI or LiBF4Any one or a combination of at least two of them;
preferably, the second additive comprises any one of or a combination of at least two of a low-impedance additive, a high-temperature additive, an anti-overcharge additive, a low-temperature additive, an additive for improving safety performance or a stabilizer;
preferably, the second additive comprises any one or a combination of at least two of propylene sulfite, phenylcyclohexane or vinyl sulfate;
preferably, in the electrolyte B, the mass fraction of the second additive is 0.5-10%;
preferably, the solvent comprises any one of ethylene carbonate, ethyl methyl carbonate, propylene carbonate, dimethyl carbonate or diethyl carbonate or a combination of at least two thereof.
5. The manufacturing method according to any one of claims 1 to 4, wherein the encapsulating of step (1) includes loading the cell into a case and baking;
preferably, step (1) further comprises: and standing and infiltrating before the negative pressure formation or the clamp formation, and standing after the negative pressure formation or the clamp formation.
6. The method according to any one of claims 1 to 5, wherein the step (2) further comprises: after the hermetic package, a capacity test was performed.
7. The preparation method according to any one of claims 1 to 6, wherein the battery core in the step (1) is subjected to a saturated liquid absorption test before being packaged with the shell.
8. The preparation method of any one of claims 1 to 7, wherein the preparation method of the battery cell in the step (1) comprises the following steps: and mixing and homogenizing the positive active material, the conductive agent and the binder, coating the mixture on an aluminum foil, mixing and homogenizing the negative active material, the conductive agent and the binder, coating the mixture on a copper foil, and performing rolling, flaking, winding, hot pressing and short circuit testing to obtain the battery core.
9. The method for preparing according to any one of claims 1 to 8, characterized in that it comprises the steps of:
(1) mixing and homogenizing a positive active material, a conductive agent and a binder, coating the mixture on an aluminum foil, mixing and homogenizing a negative active material, a conductive agent and a binder, coating the mixture on a copper foil, and performing rolling, flaking, winding, hot pressing and short circuit testing to obtain a battery core;
(2) carrying out a saturated liquid absorption test on the battery cell in the step (1);
(3) putting the battery core of the battery core in the step (1) into a shell, baking, performing primary liquid injection by using an electrolyte A, standing for infiltration, performing negative pressure formation or clamp formation, and standing to obtain a semi-finished battery;
(4) carrying out secondary liquid injection on the electrolyte B for the semi-finished product battery in the step (3), sealing and packaging to obtain the battery, and carrying out capacity test on the battery;
wherein the electrolyte A in the step (3) and the electrolyte B in the step (4) have different compositions; the electrolyte A comprises a lithium salt, a first additive and a solvent; the electrolyte B includes a lithium salt, a second additive, and a solvent:
in the preparation method, the total liquid retention of the battery consists of electrolyte A and electrolyte B, wherein the mass of the electrolyte A accounts for 75-95% of the total liquid retention of the battery, and the mass of the electrolyte B accounts for 5-25% of the total liquid retention of the battery; and the injection amount of the electrolyte A is greater than the saturated liquid absorption amount of the battery core.
10. A battery produced by the production method according to any one of claims 1 to 9.
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| US20220200043A1 (en) * | 2020-12-23 | 2022-06-23 | Ningde Amperex Technology Limited | Electrochemical apparatus, preparation method thereof, and electronic apparatus |
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