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Surface carbon coating method of lithium battery aluminum foil

A lithium battery and aluminum foil technology, which is applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of shortened cycle life, poor conductivity, and low-temperature discharge ability of batteries, so as to improve low-temperature discharge ability, improve conductivity, Effect of reducing interface resistance

Inactive Publication Date: 2020-01-03
河南豫清新能源产业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of processing lithium battery aluminum foil, it is necessary to carry out carbon coating on lithium battery aluminum foil. However, although the existing carbon coating method is convenient, it ignores the effective treatment of the oxide layer and oil stain on the surface of lithium battery, so that carbon coating is carried out directly, resulting in The conductivity is poor, the interface resistance cannot be reduced, the low-temperature discharge capacity of the battery is reduced, and the cycle life is shortened. At the same time, the carbon coating method is not reasonable, resulting in unsatisfactory results

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for coating carbon on the surface of lithium battery aluminum foil, comprising the following steps:

[0029] S1, choose Ca(OH) with a concentration of 10% 2 solution, ready to use;

[0030] S2. Soaking: put aluminum foil in Ca(OH) 2 solution, soak for 60min, and set aside;

[0031] S3, air-drying: take out the soaked aluminum foil, use an industrial air-cooler to air-dry it for 30 minutes, and set aside;

[0032] S4. Carbon coating: In vacuum or inert gases such as helium, neon, and argon, a conductive layer is sputtered or chemically deposited on the surface of aluminum foil. Optional materials for the conductive layer include but are not limited to carbon nanotubes, graphite olefin, carbon black.

Embodiment 2

[0034] A method for coating carbon on the surface of lithium battery aluminum foil, comprising the following steps:

[0035] S1, select Ca(OH) with a concentration of 12% 2 solution, ready to use;

[0036] S2. Soaking: put aluminum foil in Ca(OH) 2 Solution, soak for 52min, stand-by;

[0037] S3, air-drying: take out the soaked aluminum foil, use an industrial air-cooler to air-dry it for 25 minutes, and set aside;

[0038] S4. Carbon coating: In vacuum or inert gases such as helium, neon, and argon, a conductive layer is sputtered or chemically deposited on the surface of aluminum foil. Optional materials for the conductive layer include but are not limited to carbon nanotubes, graphite olefin, carbon black.

Embodiment 3

[0040] A method for coating carbon on the surface of lithium battery aluminum foil, comprising the following steps:

[0041] S1, choose Ca(OH) with a concentration of 10% 2 solution, ready to use;

[0042] S2. Soaking: put aluminum foil in Ca(OH) 2 solution, soak for 45min, and set aside;

[0043] S3, air-drying: take out the soaked aluminum foil, use an industrial cooler to air-dry it for 20 minutes, and set aside;

[0044] S4. Carbon coating: In vacuum or inert gases such as helium, neon, and argon, a conductive layer is sputtered or chemically deposited on the surface of aluminum foil. Optional materials for the conductive layer include but are not limited to carbon nanotubes, graphite olefin, carbon black.

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PUM

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Abstract

The invention discloses a surface carbon coating method of a lithium battery aluminum foil and belongs to the technical field of lithium battery aluminum foil processing. The method comprises steps ofS1, selecting a solution, namely selecting weak alkaline solution with a certain concentration for later use; S2, soaking, putting the aluminum foil into the weak alkaline solution, and soaking for later use; S3, air drying, taking out the soaked aluminum foil, and carrying out air drying of the aluminum foil by using an industrial air cooler for later use; and S4, carbon coating, connecting a conductive layer to a surface of the aluminum foil in a specific environment. The method is advantaged in that conductivity is improved, interface resistance is reduced, the low-temperature discharge capacity of the battery is improved, the cycle life is prolonged, and the process is scientific and reasonable.

Description

technical field [0001] The invention relates to the technical field of lithium battery aluminum foil processing, in particular to a method for coating carbon on the surface of lithium battery aluminum foil. Background technique [0002] Battery aluminum foil (Battery aluminum foil) is used as a current collector for lithium-ion batteries. Generally, the lithium-ion battery industry uses rolled aluminum foil hot-rolled as the positive electrode of the negative electrode collector. The thickness of the rolled foil varies from 10 to 50 microns. Commonly used Pure aluminum foil for lithium batteries has various alloy grades such as 1060, 1050, 1145, and 1235, and has states such as -O, H14, -H24, -H22, and -H18. [0003] In the process of processing lithium battery aluminum foil, it is necessary to carry out carbon coating on lithium battery aluminum foil. However, although the existing carbon coating method is convenient, it ignores the effective treatment of the oxide layer an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/66H01M10/0525
CPCH01M4/0426H01M4/0428H01M4/662H01M4/663H01M4/667H01M10/0525Y02E60/10
Inventor 杜洪彦宁宏军赵海刚
Owner 河南豫清新能源产业有限公司
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