CN112736287A - Electrode wetting method, electrode and battery - Google Patents
Electrode wetting method, electrode and battery Download PDFInfo
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- CN112736287A CN112736287A CN202011564253.3A CN202011564253A CN112736287A CN 112736287 A CN112736287 A CN 112736287A CN 202011564253 A CN202011564253 A CN 202011564253A CN 112736287 A CN112736287 A CN 112736287A
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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
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention provides an electrode wetting method, an electrode and a battery. The method comprises the following steps: (1) vacuumizing, introducing working gas, and baking the battery cell to obtain a baked battery cell; (2) electrolyte injection is carried out on the baked battery cell in the working gas, and the battery cell after the electrolyte injection is obtained; (3) carrying out normal temperature aging on the battery cell after liquid injection to obtain a normal temperature aged battery cell; (4) carrying out high-temperature aging on the normal-temperature aged battery cell to obtain a high-temperature aged battery cell; (5) performing vacuum air extraction on the high-temperature aged battery cell to obtain a wetted electrode in the battery cell; wherein the solubility of the working gas in the electrolyte is higher than the solubility of air in the electrolyte. The method for improving the wettability of the electrode can increase the infiltration rate of the pole piece, shorten the aging time after liquid injection and save the time cost.
Description
Technical Field
The invention belongs to the technical field of batteries, and relates to an electrode wetting method, an electrode and a battery.
Background
The lithium ion battery is expected to obtain higher energy density and endurance, and the strategy of enhancing the wettability of electrolyte to an electrode is a quick effect, so that the importance of the wettability of the electrolyte is recognized in the industry at present, and many research and development personnel improve the wettability of the electrode by modifying materials and developing a new process, reduce the wetting process time, improve the production capacity of a factory and save the time cost.
Currently, many battery companies employ high temperature aging processes to improve the wettability of the electrodes, as well as mechanical interference processes such as vibration.
The electrolyte is sensitive to high temperature, and long-time high-temperature aging easily causes decomposition and damage of electrolysis, so that various electrical properties of the battery are not facilitated; the aging at normal temperature consumes too much time; in addition, the reason why many companies do not adopt the mechanical interference type process is mainly that the instruments are complex and the purchase needs high cost.
CN110416632A discloses a method for improving the wettability of a lithium ion battery pole piece. In the winding process of the lithium ion battery pole piece, a section of infiltration film is introduced between the negative pole piece and the diaphragm inside the winding core to form a winding core structure with the negative pole piece, the infiltration film, the diaphragm and the positive pole piece sequentially attached, wherein the infiltration film is made of aluminum oxide or conductive agent materials. The infiltration film is made of graphene, carbon tubes, carbon fibers or superconducting carbon black materials. The specific surface area of the infiltration film is 50-300m2(ii) in terms of/g. The specific method for introducing a section of infiltrating film between the negative plate and the diaphragm inside the winding core comprises the following steps: adhering the infiltration film to the diaphragm through adsorption force, winding the infiltration film into the winding core along with the synchronous rotation of the diaphragm in the winding process, simultaneously jointing the infiltration film with the negative plate, cutting off the infiltration film after the infiltration film is wound to a preset length, and forming an internal structure of the winding core with the negative plate, the infiltration film, the diaphragm and the positive plate jointed in sequence; the outer structure of the winding core is continuously wound together layer by layer in the form of a negative plate, a diaphragm and a positive plate.
CN110504409A discloses a positive plate for improving permeability, which comprises a current collector, wherein n active material layers with the same thickness are arranged on two sides of the current collector; wherein n is more than or equal to 1 and less than or equal to 10; the contact angle of the surface of the current collector is theta 0, COS (theta 0) is more than or equal to 0.50 and less than 0.99, the contact angle of the surface of the active layer is thetan, and the thetan is less than or equal to 30 degrees; when COS (θ 0) < 0.94 at 0.50, θ 1 is θ 0/2, θ n is θ 1 0.9n +1, and when COS (θ 0) < 0.99 at 0.94, θ 1 is θ 0, and θ n is θ 1 0.9n + 1.
However, the methods for improving the wettability have the problems that the pole piece wetting rate needs to be improved, the aging time after liquid injection needs to be shortened, and the time cost is long. And the method has limitation on the pole piece coating material, which influences the flexibility of the method for selecting the pole piece types.
Disclosure of Invention
In view of the shortcomings of the prior art, the invention aims to provide an electrode wetting method, an electrode and a battery. The method for improving the wettability of the electrode can increase the pole piece wetting rate, shorten the aging time after liquid injection and save the time cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a method of electrode wetting, the method comprising the steps of:
(1) vacuumizing, introducing working gas, and baking the battery cell to obtain a baked battery cell;
(2) injecting electrolyte into the baked battery cell in the step (1) in the working gas to obtain an injected battery cell;
(3) carrying out normal temperature aging on the battery cell after the liquid injection in the step (2) to obtain a normal temperature aged battery cell;
(4) carrying out high-temperature aging on the normal-temperature aged battery cell in the step (3) to obtain a high-temperature aged battery cell;
(5) performing vacuum air extraction on the high-temperature aged battery cell in the step (4) to obtain a wetted electrode in the battery cell;
wherein the solubility of the working gas in the electrolyte is higher than the solubility of air in the electrolyte.
In the invention, the working gas with higher solubility in the electrolyte is adopted, because the gas absorbed by the pole piece is dissolved in the electrolyte, the surface of the pole piece is changed from a gas-solid phase to a liquid-solid phase, which is also called as the infiltration of the pole piece at the stage, the infiltration rate is greatly improved, and the effect of shortening the time of the wetting process is achieved.
The method for improving the wettability of the electrode can increase the infiltration rate of the pole piece, shorten the aging time after liquid injection and save the time cost.
In the method for improving the wettability of the electrode, the working gas is introduced for baking, so that the gas adsorbed by the pole piece is replaced by the working gas with higher solubility in the electrolyte.
The aim of filling working gas into the liquid injection is to ensure that most of the adsorption of the pole piece is the gas.
Working gas absorbed by the pole piece is dissolved in electrolyte during normal temperature aging, the surface of the pole piece is changed from gas-solid phase to liquid-solid phase, the pole piece is soaked in the stage, the soaking rate is greatly improved, and the effect of shortening the time of the wetting process is achieved.
The working gas is reduced in solubility in the electrolyte during high-temperature aging and is separated from the liquid in the form of gas.
And finally, vacuum pumping is carried out to pump out the working gas and the reaction gas generated in the high-temperature aging stage.
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 embodiment of the present invention, the degree of vacuum in the evacuation in the step (1) is-95 to-92 kPa, for example, -95kPa, -94kPa, -93kPa, or-92 kPa.
Preferably, the working gas of step (1) comprises carbon dioxide. The working gas has the advantages that the carbon dioxide is similar to the chemical bond structure of the electrolyte, is easier to dissolve in the electrolyte and can provide better stability of the cathode.
Preferably, the cells of step (1) comprise wound cells and/or laminated cells.
Preferably, the battery core in step (1) comprises electrodes and a diaphragm, wherein the electrodes comprise a positive electrode and a negative electrode.
One of the advantages of the method provided by the invention is that the method is suitable for various electrodes, and the wettability of the electrodes can be improved by using the method provided by the invention no matter lithium iron phosphate positive electrode material, ternary positive electrode material, lithium manganate positive electrode material, lithium cobaltate positive electrode material, graphite negative electrode material, silicon carbon negative electrode material and the like.
As a preferred embodiment of the present invention, the step (1) further comprises: and repeatedly carrying out operations of vacuumizing and introducing working gas in the baking process. The operation of repeatedly pumping and introducing working gas can ensure that the air is pumped out completely, and the purpose of replacing the gas absorbed by the pole piece is better achieved.
Preferably, the number of repetitions is 5-10, such as 5, 6, 7, 8, 9 or 10.
As a preferred embodiment of the present invention, the electrolyte in step (2) includes a solvent and a lithium salt.
Preferably, the solvent comprises any one of ethylene carbonate, propylene carbonate, diethyl carbonate, dimethyl carbonate or ethyl methyl carbonate or a combination of at least two thereof.
Preferably, the lithium salt comprises lithium hexafluorophosphate.
Preferably, the electrolyte further comprises an additive.
Preferably, the additive comprises any one of vinylene carbonate, fluoroethylene carbonate or difluoroethylene carbonate or a combination of at least two of them.
As a preferred embodiment of the present invention, the temperature of the room-temperature aging in the step (3) is 15 to 35 ℃ such as 15 ℃, 16 ℃, 17 ℃, 18 ℃, 19 ℃, 20 ℃, 21 ℃, 22 ℃, 23 ℃, 24 ℃, 25 ℃, 26 ℃, 27 ℃, 28 ℃, 29 ℃, 30 ℃, 31 ℃, 32 ℃, 33 ℃, 34 ℃ or 35 ℃.
Preferably, the time of the normal temperature aging in the step (3) is 24-48h, such as 24h, 36h, 42h or 48 h.
As a preferable embodiment of the present invention, the high-temperature aging temperature in the step (4) is 40 to 50 ℃, for example, 40 ℃, 42 ℃, 45 ℃, 48 ℃ or 50 ℃.
Preferably, the high temperature aging time in the step (4) is 6-18h, such as 6h, 10h, 14h or 18 h.
As a preferable embodiment of the present invention, the degree of vacuum of the vacuum suction in the step (5) is-90 to-80 kPa, for example, -80kPa, -82kPa, -85kPa, -87kPa, or-90 kPa.
As a further preferred technical solution of the method of the present invention, the method comprises the steps of:
(1) vacuumizing, introducing working gas, baking the battery cell, and repeatedly vacuumizing and introducing the working gas for 5-10 times in the baking process to obtain the baked battery cell;
(2) injecting electrolyte into the baked battery cell in the step (1) in the working gas to obtain an injected battery cell;
(3) carrying out normal-temperature aging on the battery cell after the liquid injection in the step (2), wherein the normal-temperature aging temperature is 15-35 ℃, and the normal-temperature aging time is 24-48h, so as to obtain a normal-temperature aged battery cell;
(4) carrying out high-temperature aging on the normal-temperature aged battery cell in the step (3), wherein the high-temperature aging temperature is 40-50 ℃, and the high-temperature aging time is 6-18h, so as to obtain a high-temperature aged battery cell;
(5) performing vacuum air extraction on the high-temperature aged battery cell in the step (4) to obtain a wetted electrode in the battery cell; the vacuum degree of the vacuum pumping is-80 to-90 kPa;
wherein the solubility of the working gas in the electrolyte is higher than the solubility of air in the electrolyte.
In a second aspect, the present invention provides an electrode obtained after treatment by the method of the first aspect.
In a third aspect, the invention provides a battery comprising an electrode as described in the second aspect.
Compared with the prior art, the invention has the following beneficial effects:
the method for improving the wettability of the electrode can increase the infiltration rate of the pole piece, shorten the aging time after liquid injection and save the time cost. The method can achieve the effect of improving the electrode wetting efficiency and achieve the purpose of saving time and cost.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The embodiment provides an electrode wetting method, which specifically comprises the following steps:
(1) vacuumizing until the vacuum degree is-93 kPa, introducing working gas carbon dioxide, baking the battery cell, and repeatedly performing the operations of vacuumizing and introducing the working gas for 8 times in the baking process to obtain the baked battery cell;
(2) injecting electrolyte into the baked battery cell in the step (1) in the working gas to obtain an injected battery cell;
(3) carrying out normal-temperature aging on the battery cell after the liquid injection in the step (2), wherein the normal-temperature aging temperature is 25 ℃, and the high-temperature aging time is 36h, so as to obtain a normal-temperature aged battery cell;
(4) carrying out high-temperature aging on the normal-temperature aged battery cell in the step (3), wherein the high-temperature aging temperature is 45 ℃, and the high-temperature aging time is 12 hours, so as to obtain a high-temperature aged battery cell;
(5) and (4) performing vacuum air extraction (the vacuum degree of the vacuum air extraction is-85 kPa) on the high-temperature aged battery core in the step (4), and obtaining the wetted electrode in the battery core.
The battery cell used in this example is a wound battery cell, the positive plate is a lithium iron phosphate positive plate (the mass ratio of lithium iron phosphate to acetylene black to PVDF on the coating of the plate is 94:3:3), the negative plate is a graphite negative plate (the mass ratio of graphite to acetylene black to SBR on the coating of the plate is 92:4:4), and the diaphragm is a PP diaphragm.
The lithium salt of the electrolyte used in this example was 1M LiPF6The solvent is ethylene carbonate and dimethyl carbonate in a volume ratio of 1: 2.
Example 2
The embodiment provides an electrode wetting method, which specifically comprises the following steps:
(1) vacuumizing until the vacuum degree is-94 kPa, introducing working gas carbon dioxide, baking the battery cell, and repeatedly vacuumizing and introducing the working gas for 7 times in the baking process to obtain the baked battery cell;
(2) injecting electrolyte into the baked battery cell in the step (1) in the working gas to obtain an injected battery cell;
(3) carrying out normal-temperature aging on the battery cell after the liquid injection in the step (2), wherein the normal-temperature aging temperature is 25 ℃, and the high-temperature aging time is 42h, so as to obtain a normal-temperature aged battery cell;
(4) carrying out high-temperature aging on the normal-temperature aged battery cell in the step (3), wherein the high-temperature aging temperature is 47 ℃, and the high-temperature aging time is 10 hours, so as to obtain a high-temperature aged battery cell;
(5) and (4) performing vacuum pumping on the high-temperature aged battery cell in the step (4) (the vacuum degree of the vacuum pumping is-87 kPa, and the electrode in the battery cell is the wetted electrode.
The battery cell used in this example is a wound battery cell, the positive plate is a lithium iron phosphate positive plate (the mass ratio of lithium iron phosphate to acetylene black to PVDF on the coating of the plate is 94:3:3), the negative plate is a graphite negative plate (the mass ratio of graphite to acetylene black to SBR on the coating of the plate is 92:4:4), and the diaphragm is a PP diaphragm.
The lithium salt of the electrolyte used in this example was 1M LiPF6The solvent is ethylene carbonate and dimethyl carbonate in a volume ratio of 1: 2.
Example 3
The embodiment provides an electrode wetting method, which specifically comprises the following steps:
(1) vacuumizing until the vacuum degree is-95 kPa, introducing working gas carbon dioxide, baking the battery cell, and repeatedly vacuumizing and introducing the working gas for 5 times in the baking process to obtain the baked battery cell;
(2) injecting electrolyte into the baked battery cell in the step (1) in the working gas to obtain an injected battery cell;
(3) carrying out normal-temperature aging on the battery cell after the liquid injection in the step (2), wherein the normal-temperature aging temperature is 15 ℃, and the high-temperature aging time is 48 hours, so as to obtain a normal-temperature aged battery cell;
(4) carrying out high-temperature aging on the normal-temperature aged battery cell in the step (3), wherein the high-temperature aging temperature is 40 ℃, and the high-temperature aging time is 18h, so as to obtain a high-temperature aged battery cell;
(5) and (4) performing vacuum air extraction (the vacuum degree of the vacuum air extraction is-80 kPa) on the high-temperature aged battery core in the step (4), and obtaining the wetted electrode in the battery core.
The battery cell used in this example is a wound battery cell, the positive plate is a lithium iron phosphate positive plate (mass ratio of lithium manganate to ketjen black to PVDF on the coating of the pole piece is 92:4:4), the negative plate is a graphite negative plate (mass ratio of silicon carbon to ketjen black to SBR on the coating of the pole piece is 90:5:5), and the separator is a PP separator.
The lithium salt of the electrolyte used in this example was 1M LiPF6The solvent is ethylene carbonate, dimethyl carbonate and ethyl methyl carbonate in the volume ratio of 1:1: 1.
Example 4
The embodiment provides an electrode wetting method, which specifically comprises the following steps:
(1) vacuumizing until the vacuum degree is-92 kPa, introducing working gas carbon dioxide, baking the battery cell, and repeatedly vacuumizing and introducing the working gas for 10 times in the baking process to obtain the baked battery cell;
(2) injecting electrolyte into the baked battery cell in the step (1) in the working gas to obtain an injected battery cell;
(3) carrying out normal-temperature aging on the battery cell after the liquid injection in the step (2), wherein the normal-temperature aging temperature is 35 ℃, and the high-temperature aging time is 24 hours, so as to obtain a normal-temperature aged battery cell;
(4) carrying out high-temperature aging on the normal-temperature aged battery cell in the step (3), wherein the high-temperature aging temperature is 50 ℃, and the high-temperature aging time is 6 hours, so as to obtain a high-temperature aged battery cell;
(5) and (4) performing vacuum air extraction (the vacuum degree of the vacuum air extraction is-90 kPa) on the high-temperature aged battery core in the step (4), and obtaining the wetted electrode in the battery core.
The battery cell used in this example is a wound battery cell, the positive plate is a lithium iron phosphate positive plate (the mass ratio of NCM811: acetylene black: PVDF on the coating of the plate is 94:3:3), the negative plate is a graphite negative plate (the mass ratio of graphite: acetylene black: SBR on the coating of the plate is 92:4:4), and the diaphragm is a PP diaphragm.
The lithium salt of the electrolyte used in this example was 1M LiPF6The solvent is ethylene carbonate, dimethyl carbonate and ethyl methyl carbonate with the volume ratio of 1:1:1, and the additive is fluoroethylene carbonate accounting for 0.5 percent of the total mass of the electrolyte.
Comparative example 1
This comparative example was conducted in the same manner as in example 1, except that the working gas was not used, and air was used instead in step (1) and step (2).
Comparative example 2
This comparative example was conducted in the same manner as in example 1, except that in step (1), a working gas was not used and air was used instead.
Comparative example 3
This comparative example was conducted in the same manner as in example 1, except that in step (2), the working gas was not used but air was used instead.
The method for improving the electrode wettability provided by the embodiment can increase the pole piece wetting rate, shorten the aging time after liquid injection and save the time cost. The method can improve the electrode wetting efficiency and achieve the purpose of saving time and cost.
In comparative example 1, working gas is not used in both the baking and liquid injection steps, so that the pole piece wetting rate is poor, and the pole piece wetting effect is poor when the same aging time as that in example 1 is adopted.
In comparative example 2, since no working gas was used in the baking step, the pole piece wetting rate was slightly poor, and the pole piece wetting effect was not good when the same aging time as in example 1 was used.
In comparative example 3, working gas is not used in the liquid injection step, so that the pole piece wetting rate is slightly poor, and the pole piece wetting effect is poor by adopting the same aging time as that of example 1.
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 wetting an electrode, the method comprising the steps of:
(1) vacuumizing, introducing working gas, and baking the battery cell to obtain a baked battery cell;
(2) injecting electrolyte into the baked battery cell in the step (1) in the working gas to obtain an injected battery cell;
(3) carrying out normal temperature aging on the battery cell after the liquid injection in the step (2) to obtain a normal temperature aged battery cell;
(4) carrying out high-temperature aging on the normal-temperature aged battery cell in the step (3) to obtain a high-temperature aged battery cell;
(5) performing vacuum air extraction on the high-temperature aged battery cell in the step (4) to obtain a wetted electrode in the battery cell;
wherein the solubility of the working gas in the electrolyte is higher than the solubility of air in the electrolyte.
2. The method according to claim 1, wherein the vacuum degree of the vacuum pumping in the step (1) is-95 to-92 kPa;
preferably, the working gas of step (1) comprises carbon dioxide;
preferably, the cells of step (1) comprise wound cells and/or laminated cells;
preferably, the battery core in step (1) comprises electrodes and a diaphragm, wherein the electrodes comprise a positive electrode and a negative electrode.
3. The method of claim 1 or 2, wherein step (1) further comprises: repeatedly carrying out operations of vacuumizing and introducing working gas in the baking process;
preferably, the number of repetitions is 5-10.
4. The method of any one of claims 1-3, wherein the electrolyte of step (2) comprises a solvent and a lithium salt;
preferably, the solvent comprises any one of ethylene carbonate, propylene carbonate, diethyl carbonate, dimethyl carbonate or ethyl methyl carbonate or a combination of at least two of the above;
preferably, the lithium salt comprises lithium hexafluorophosphate;
preferably, the electrolyte further comprises an additive;
preferably, the additive comprises any one of vinylene carbonate, fluoroethylene carbonate or difluoroethylene carbonate or a combination of at least two of them.
5. The method according to any one of claims 1 to 4, wherein the temperature of the room-temperature aging of step (3) is 15 to 35 ℃;
preferably, the time of the normal-temperature aging in the step (3) is 24-48 h.
6. The method according to any one of claims 1 to 5, wherein the high temperature aging temperature of step (4) is 40 to 50 ℃;
preferably, the high-temperature aging time in the step (4) is 6-18 h.
7. The method according to any one of claims 1 to 6, wherein the degree of vacuum of the vacuum suction in step (5) is-90 to-80 kPa.
8. Method according to any of claims 1-7, characterized in that the method comprises the steps of:
(1) vacuumizing, introducing working gas, baking the battery cell, and repeatedly vacuumizing and introducing the working gas for 5-10 times in the baking process to obtain the baked battery cell;
(2) injecting electrolyte into the baked battery cell in the step (1) in the working gas to obtain an injected battery cell;
(3) carrying out normal-temperature aging on the battery cell after the liquid injection in the step (2), wherein the normal-temperature aging temperature is 15-35 ℃, and the normal-temperature aging time is 24-48h, so as to obtain a normal-temperature aged battery cell;
(4) carrying out high-temperature aging on the normal-temperature aged battery cell in the step (3), wherein the high-temperature aging temperature is 40-50 ℃, and the high-temperature aging time is 6-18h, so as to obtain a high-temperature aged battery cell;
(5) performing vacuum air extraction on the high-temperature aged battery cell in the step (4) to obtain a wetted electrode in the battery cell; the vacuum degree of the vacuum pumping is-80 to-90 kPa;
wherein the solubility of the working gas in the electrolyte is higher than the solubility of air in the electrolyte.
9. An electrode obtained after treatment according to the method of any one of claims 1 to 8.
10. A battery comprising the electrode of claim 9.
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Application publication date: 20210430 |