CN114094053A - Tail aluminum foil processing method for improving safety test of lithium ion battery - Google Patents
Tail aluminum foil processing method for improving safety test of lithium ion battery Download PDFInfo
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- CN114094053A CN114094053A CN202111305804.9A CN202111305804A CN114094053A CN 114094053 A CN114094053 A CN 114094053A CN 202111305804 A CN202111305804 A CN 202111305804A CN 114094053 A CN114094053 A CN 114094053A
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- 239000011888 foil Substances 0.000 title claims abstract description 77
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 61
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 61
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 27
- 238000011076 safety test Methods 0.000 title claims abstract description 23
- 238000003672 processing method Methods 0.000 title claims description 5
- 238000000576 coating method Methods 0.000 claims abstract description 45
- 229910052751 metal Inorganic materials 0.000 claims abstract description 45
- 239000002184 metal Substances 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 45
- 239000011248 coating agent Substances 0.000 claims abstract description 44
- 239000002002 slurry Substances 0.000 claims abstract description 22
- 239000012528 membrane Substances 0.000 claims abstract description 21
- 239000006182 cathode active material Substances 0.000 claims abstract description 14
- 238000005096 rolling process Methods 0.000 claims abstract description 5
- 238000007789 sealing Methods 0.000 claims abstract description 5
- 238000004804 winding Methods 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 claims description 19
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 18
- 230000003647 oxidation Effects 0.000 claims description 12
- 238000007254 oxidation reaction Methods 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 12
- 230000009471 action Effects 0.000 claims description 10
- 230000001590 oxidative effect Effects 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 239000002033 PVDF binder Substances 0.000 claims description 6
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 4
- 229910021641 deionized water Inorganic materials 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 3
- 229920001328 Polyvinylidene chloride Polymers 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 3
- 239000002041 carbon nanotube Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000011247 coating layer Substances 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 3
- 239000011256 inorganic filler Substances 0.000 claims description 3
- 229910003475 inorganic filler Inorganic materials 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 239000005033 polyvinylidene chloride Substances 0.000 claims description 3
- 238000007765 extrusion coating Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 12
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000010301 surface-oxidation reaction Methods 0.000 abstract 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 15
- 239000007773 negative electrode material Substances 0.000 description 12
- 238000005524 ceramic coating Methods 0.000 description 10
- 238000001125 extrusion Methods 0.000 description 6
- 239000000919 ceramic Substances 0.000 description 5
- 239000007774 positive electrode material Substances 0.000 description 4
- 239000013543 active substance Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000001467 acupuncture Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000006255 coating slurry Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000009778 extrusion testing Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
-
- 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
- H01M10/058—Construction or manufacture
-
- 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
Abstract
The invention belongs to the technical field of batteries, and particularly relates to a tail aluminum foil treatment method for improving safety test of a lithium ion battery, which comprises the following steps of firstly, carrying out surface oxidation treatment on a metal foil at the tail part of a short membrane surface of a cathode plate; coating the slurry of the safety coating on the surface of the metal foil, and then baking; step three, coating the cathode active material slurry on the surface of the safety coating, and then baking; and step four, rolling, slitting, winding and top side sealing are carried out on the baked cathode sheet to form the battery cell. The invention can solve the problem of thermal runaway caused by short circuit of the positive electrode and the negative electrode in the needling process of the battery, and is beneficial to improving the safety of the battery.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a tail aluminum foil processing method for improving safety test of a lithium ion battery.
Background
The lithium ion battery has the advantages of high specific energy, strong continuous capability, long cycle life, wide working range, short charging time, large-current discharge and the like, and is widely applied to the power fields of electric vehicles and the like and the consumption fields of mobile phones, watches, flat plates, notebooks and the like. With the development of lithium ion batteries in the fields of fast charging, high energy density and the like, the safety problem caused by the battery core becomes the focus of attention of people gradually. Lithium ion battery drop tests are a direction of concern.
Four types of contact short circuits can occur in the lithium ion battery in the test processes of needling, foreign matter extrusion and the like, namely positive active materials and negative active materials, positive active materials and negative current collectors, positive current collectors and negative active materials and positive current collectors and negative current collectors. Among the four short-circuiting methods, the short-circuiting method in which thermal runaway is most likely to occur is a short-circuiting between the "positive electrode current collector and the negative electrode active material".
In order to improve the safety test of the lithium ion battery, the most common method at present is to coat a layer of safety coating between the positive electrode current collector and the positive electrode active material, and in order to improve the direct contact between the hollow aluminum foil at the tail end of the positive electrode plate and the negative electrode active material in the needling and foreign matter extrusion test processes.
In the existing structure, a ceramic coating is required to be coated on the single-surface area of the tail part hollow aluminum foil. The ceramic coating has a certain thickness of 7-10 um, and mainly comprises Al2O3The ceramic coating has a certain thickness, so that the energy density of the battery cell is lost; meanwhile, the ceramic coating is easy to peel off in the processes of needling and foreign matter extrusion, so that the aluminum foil is exposed to contact with the negative active material and finally short circuit occurs.
Disclosure of Invention
The invention aims to: aiming at the defects of the prior art, the method for processing the tail aluminum foil for improving the safety test of the lithium ion battery is provided, the problem of thermal runaway caused by the short circuit of the positive electrode and the negative electrode in the needling process of the battery can be solved, and the safety of the battery is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a tail aluminum foil processing method for improving safety test of a lithium ion battery comprises the following steps:
step one, carrying out oxidation treatment on the surface of a metal foil at the tail part of a short membrane surface of a cathode sheet;
coating the slurry of the safety coating on the surface of the metal foil, and then baking;
step three, coating the cathode active material slurry on the surface of the safety coating, and then baking;
and step four, rolling, slitting, winding and top side sealing are carried out on the baked cathode sheet to form the battery cell.
Preferably, the step one includes:
and (3) placing the metal foil at the tail part of the short membrane surface in a sulfuric acid solution as an anode, electrolyzing under the action of an impressed current to form an oxide layer on the surface of the metal foil, and cleaning the oxidized metal foil by deionized water to remove the residual sulfuric acid solution.
Preferably, in the first step, the surface of the metal foil at the tail of the short membrane surface is oxidized to form an oxide layer, and the thickness of the oxide layer is greater than 3 um.
Preferably, in the second step, the security coating slurry is coated on the surface of the metal foil by using a gravure roll.
Preferably, in the third step, the method includes:
and coating cathode active material slurry on the surface of the safety coating by adopting an extrusion coating machine.
Preferably, the cathode active material slurry includes lithium cobaltate, PVDF, conductive carbon, carbon nanotubes, NMP.
Preferably, the security coating comprises a polyvinylidene fluoride and/or polyvinylidene chloride polymer matrix, a conductive material and an inorganic filler.
Preferably, two sides of the cathode sheet are respectively provided with a short membrane surface and a long membrane surface, and the short membrane surface and the long membrane surface are both provided with a safety coating.
The method has the beneficial effects that the method comprises the steps of firstly, carrying out oxidation treatment on the surface of the metal foil at the tail part of the short membrane surface of the cathode sheet; coating the slurry of the safety coating on the surface of the metal foil, and then baking; step three, coating the cathode active material slurry on the surface of the safety coating, and then baking; and step four, rolling, slitting, winding and top side sealing are carried out on the baked cathode sheet to form the battery cell. In the existing structure, the ceramic coating has a certain thickness, so that the energy density of the battery cell is lost; meanwhile, the ceramic coating is easy to peel off in the processes of needling and foreign matter extrusion, so that the aluminum foil is exposed to contact with a negative active material and finally short circuit occurs, the metal foil is coated with a layer of ceramic, the thickness of the ceramic is more than or equal to 7 micrometers, a certain bonding force is ensured between the ceramic coating and the aluminum foil, the tail aluminum foil is not oxidized in the needling process, the possibility of peeling exists, the aluminum foil is directly contacted with the negative active material, a large amount of joule heat is generated to cause thermal runaway, therefore, the tail aluminum foil of the cathode plate is oxidized to generate an oxide layer, namely, aluminum oxide, the aluminum oxide generated on the surface of the aluminum foil is compact, further oxidation inside can be prevented, and the inside metal aluminum can be prevented from directly contacting with the negative active material; meanwhile, the aluminum oxide is formed by oxidizing a part of metal aluminum on the surface of the aluminum foil, the acting force of the aluminum oxide and the internal metal aluminum is the combined action of a metal bond and a covalent bond, the aluminum oxide on the surface is not easy to peel off under the action of needling, and the aluminum oxide is formed by directly oxidizing the metal aluminum on the surface, so that the thickness is not increased. The invention can solve the problem of thermal runaway caused by short circuit of the positive electrode and the negative electrode in the needling process of the battery, and is beneficial to improving the safety of the battery. Compared with the method that the tail part is coated with ceramic to improve the needling performance of the battery core, the method has the advantages of short time consumption and simple process, can improve the needling performance of the battery core, and cannot cause energy density loss.
Drawings
Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
Wherein the reference numerals are as follows:
1-a metal foil;
2-an oxide layer;
3-a safety coating;
4-cathode active material slurry.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The present invention will be described in further detail with reference to fig. 1, but the present invention is not limited thereto.
Detailed description of the preferred embodiments
The tail aluminum foil treatment method for improving the safety test of the lithium ion battery comprises the following steps:
firstly, oxidizing the surface of a metal foil 1 at the tail part of the short membrane surface of a cathode sheet;
coating the slurry of the safety coating 3 on the surface of the metal foil 1, and then baking;
step three, coating the cathode active material slurry 4 on the surface of the safety coating 3, and then baking;
and step four, rolling, slitting, winding and top side sealing are carried out on the baked cathode sheet to form the battery cell.
It should be noted that: in the existing structure, the ceramic coating has a certain thickness, so that the energy density of the battery cell is lost; meanwhile, the ceramic coating is easy to peel off in the processes of needling and foreign matter extrusion, so that the aluminum foil is exposed to contact with a negative active material and finally short circuit occurs, in addition, the metal foil 1 is coated with a layer of ceramic, the thickness of the ceramic is more than or equal to 7 mu m, certain bonding force is ensured between the ceramic coating and the aluminum foil, the aluminum foil at the tail part is not subjected to oxidation treatment in the needling process, the possibility of peeling exists, so that the aluminum foil is directly contacted with the negative active material, a large amount of joule heat is generated to cause thermal runaway due to internal short circuit, therefore, the aluminum foil at the tail part of the cathode plate is oxidized by an oxidation method to generate an oxide layer 2, namely, the aluminum oxide is generated on the surface of the aluminum foil, the further oxidation inside can be prevented, and the direct contact between the inside metal aluminum and the negative active material can also be prevented; meanwhile, the aluminum oxide is formed by oxidizing a part of metal aluminum on the surface of the aluminum foil, the acting force of the aluminum oxide and the internal metal aluminum is the combined action of a metal bond and a covalent bond, the aluminum oxide on the surface is not easy to peel off under the action of needling, and the aluminum oxide is formed by directly oxidizing the metal aluminum on the surface, so that the thickness is not increased.
In the method for processing the tail aluminum foil for improving the safety test of the lithium ion battery, the first step comprises the following steps:
and placing the metal foil 1 at the tail part of the short membrane surface in a sulfuric acid solution as an anode, electrolyzing under the action of an external current to form an oxide layer 2 on the surface of the metal foil 1, and cleaning the oxidized metal foil 1 by deionized water to remove the residual sulfuric acid solution.
It should be noted that: the tail aluminum foil is placed in a sulfuric acid solution to serve as an anode, electrolysis is carried out under the action of an impressed current, an oxide layer 2 is formed on the surface of the aluminum foil, the thickness of the oxide layer 2 is larger than 3 microns, the oxidized aluminum foil is washed by deionized water to remove the residual sulfuric acid solution, an oil stain layer is coated on the surface of one side which does not need oxidation treatment before the oxidation treatment, ionization and oxidation in the sulfuric acid solution are prevented, and oil stains are subsequently washed.
In the method for processing the tail aluminum foil for improving the safety test of the lithium ion battery, in the first step, the surface of the metal foil 1 at the tail part of the short film surface is oxidized to form an oxide layer 2, and the thickness of the oxide layer 2 is more than 3 um.
It should be noted that: the aluminum oxide generated on the surface of the aluminum foil is very compact, can prevent the interior from being further oxidized, has better corrosion resistance, and can well prevent the interior metal aluminum from directly contacting with the cathode active material; meanwhile, the aluminum oxide is formed by oxidizing a part of metal aluminum on the surface of the aluminum foil, the acting force with the internal metal aluminum is the combined action of a metal bond and a covalent bond, and the metal aluminum on the surface is not easy to peel off under the action of needling; and the aluminum oxide is formed by directly oxidizing surface metal aluminum, so that the thickness is not increased, and the energy density loss caused by the generation of the aluminum oxide is avoided.
In the method for processing the tail aluminum foil for improving the safety test of the lithium ion battery, in the second step, the safety coating 3 slurry is coated on the surface of the metal foil 1 by using a gravure roll.
It should be noted that: and coating the safety coating 3 slurry on the surface of the aluminum foil according to the designed size by using a gravure roller.
It should be noted that: the safety coating 3 does not cover the oxide layer 2 formed on the surface of the metal foil 1.
In the method for processing the tail aluminum foil for improving the safety test of the lithium ion battery, the third step comprises the following steps:
the cathode active material slurry 4 was coated on the surface of the safety coating layer 3 using an extrusion coater.
It should be noted that: the coating process ensures that the active substance slurry completely covers the safety coating 3, and the coated pole piece is baked to obtain the cathode pole piece.
In the method for treating the tail aluminum foil for improving the safety test of the lithium ion battery according to the present invention, the cathode active material slurry 4 includes lithium cobaltate, PVDF, conductive carbon, carbon nanotubes, NMP, but the present invention is not limited thereto, and may be other cathode active material slurries 4.
In the method for treating the tail aluminum foil for improving the safety test of the lithium ion battery according to the present invention, the safety coating layer 3 includes a polyvinylidene fluoride and/or polyvinylidene chloride polymer matrix, a conductive material and an inorganic filler.
In the method for treating the tail aluminum foil for improving the safety test of the lithium ion battery according to the invention, the two sides of the cathode sheet are respectively provided with the short film surface and the long film surface, and the short film surface and the long film surface are both provided with the safety coating 3.
Comparative embodiment
The difference from the first embodiment is that: the tail aluminum foil of the present embodiment is not subjected to oxidation treatment.
Specifically, the method comprises the steps of coating a safety coating 3 and coating a positive electrode material, wherein the coating sequence comprises the steps of coating the safety coating 3 on a long membrane surface and a short membrane surface, and coating the long membrane surface and the short membrane surface of the positive electrode active substance.
Other methods are the same as the first embodiment and are not described herein.
Table 1, cell performance test results of embodiment and comparative embodiment
| Test method | Common electrical core (contrast implementation mode) | Safety electric core (implementation mode) |
| Multiplying power | 5/5 | 5/5 |
| Low temperature | 5/5 | 5/5 |
| Acupuncture and moxibustion | 0/5 | 5/5 |
| Foreign matter squeezing | 0/5 | 5/5 |
As shown in table 1, in the needling process and the foreign matter extrusion, the electric core of which the tail aluminum foil is not subjected to oxidation treatment has the possibility of falling off, so that the aluminum foil is directly contacted with the negative active material, and a large amount of joule heat is generated by internal short circuit to cause thermal runaway.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (8)
1. A tail aluminum foil processing method for improving safety test of a lithium ion battery is characterized by comprising the following steps:
firstly, oxidizing the surface of a metal foil (1) at the tail part of the short membrane surface of a cathode sheet;
coating the slurry of the safety coating (3) on the surface of the metal foil (1), and then baking;
coating the cathode active material slurry (4) on the surface of the safety coating (3), and then baking;
and step four, rolling, slitting, winding and top side sealing are carried out on the baked cathode sheet to form the battery cell.
2. The method for processing the tail aluminum foil for improving the safety test of the lithium ion battery as claimed in claim 1, wherein the step one comprises:
and (2) placing the metal foil (1) at the tail part of the short membrane surface in a sulfuric acid solution as an anode, electrolyzing under the action of an external current to form an oxide layer (2) on the surface of the metal foil (1), and cleaning the oxidized metal foil (1) by deionized water to remove the residual sulfuric acid solution.
3. The method for processing the tail aluminum foil for improving the safety test of the lithium ion battery as claimed in claim 1, wherein the method comprises the following steps: in the first step, an oxide layer (2) is formed on the surface of the metal foil (1) at the tail part of the short film surface through oxidation treatment, and the thickness of the oxide layer (2) is larger than 3 um.
4. The method for processing the tail aluminum foil for improving the safety test of the lithium ion battery as claimed in claim 1, wherein the method comprises the following steps: and in the second step, coating the safety coating (3) slurry on the surface of the metal foil (1) by adopting a gravure roller.
5. The method for processing the tail aluminum foil for improving the safety test of the lithium ion battery as claimed in claim 1, wherein the third step comprises:
and coating cathode active material slurry (4) on the surface of the safety coating layer (3) by adopting an extrusion coating machine.
6. The method for processing the tail aluminum foil for improving the safety test of the lithium ion battery as claimed in claim 1, wherein the method comprises the following steps: the cathode active material slurry (4) comprises lithium cobaltate, PVDF, conductive carbon, carbon nano tubes and NMP.
7. The method for processing the tail aluminum foil for improving the safety test of the lithium ion battery as claimed in claim 1, wherein the method comprises the following steps: the safety coating (3) comprises a polyvinylidene fluoride and/or polyvinylidene chloride polymer matrix, a conductive material and an inorganic filler.
8. The method for processing the tail aluminum foil for improving the safety test of the lithium ion battery as claimed in claim 1, wherein the method comprises the following steps: the two sides of the cathode sheet are respectively provided with a short membrane surface and a long membrane surface, and the short membrane surface and the long membrane surface are both provided with a safety coating (3).
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