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Oxide film removing method for lithium battery aluminum foils

A technology for removing oxide films and lithium batteries, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems that the conductivity of aluminum foil is not improved and affects the conductivity of aluminum foil, and achieve the effect of improving conductivity and prolonging cycle life

Inactive Publication Date: 2020-01-07
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] When the aluminum foil is placed in the air, the surface of the aluminum foil is prone to oxidation, and an oxide film is formed after oxidation. This oxide film seriously affects the conductivity of the aluminum foil. When making the aluminum foil of the battery, the aluminum foil must be removed before making Oxide film, most of the existing methods for removing oxide film are to put aluminum foil on Ca(OH) 2 Remove the oxide film from the solution, this method can remove the oxide film, but the conductivity of the aluminum foil has not improved

Method used

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  • Oxide film removing method for lithium battery aluminum foils

Examples

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Effect test

Embodiment 1

[0024] Preparation materials: 40 parts of ionized water, Ca(OH) 2 5 parts, conductive alkyne 10 parts, acetylene black 10 parts, carbon nanotubes 10 parts and polyacetate 7 parts.

[0025] The main steps are divided into six steps, namely:

[0026] S1, 40 parts of deionized water and 5 parts of Ca(OH) 2 Add it into an ultrasonic mixer, vibrate with ultrasonic waves, and stir with a stirrer at the same time to obtain the first mixture. The stirring speed is 800r / min, the stirring time is 10min, and the frequency of the ultrasonic mixer is 28khz;

[0027] S2, heat up the solution obtained in S1, heat up to a certain temperature, stop the temperature rise, and stir at the same time, add 10 parts of conductive alkyne, 10 parts of acetylene black and 10 parts of carbon nanotubes while stirring, and stir to form a paste. For the second mixture, the temperature is raised to 50°C, the stirring speed is 800r / min, the stirring time is 15min, and the heating rate is 10°C / min;

[0028]...

Embodiment 2

[0033] Preparation materials: 50 parts of ionized water, Ca(OH) 2 6 parts, conductive alkyne 13 parts, acetylene black 13 parts, carbon nanotubes 13 parts and polyacetate 8 parts.

[0034] The main steps are divided into six steps, namely:

[0035] S1, 50 parts of deionized water and 6 parts of Ca(OH) 2 Add it into an ultrasonic mixer, vibrate with ultrasonic waves, and stir with a stirrer at the same time to obtain the first mixture. The stirring speed is 800r / min, the stirring time is 10min, and the frequency of the ultrasonic mixer is 28khz;

[0036] S2, heat up the solution obtained in S1, heat up to a certain temperature, stop the temperature rise, and stir at the same time, add 13 parts of conductive alkyne, 13 parts of acetylene black and 13 parts of carbon nanotubes while stirring, and stir into a paste state to obtain the first For the second mixture, the temperature is raised to 50°C, the stirring speed is 800r / min, the stirring time is 15min, and the heating rate ...

Embodiment 3

[0042] Preparation materials: 60 parts of ionized water, Ca(OH) 2 8 parts, conductive alkyne 15 parts, acetylene black 15 parts, carbon nanotubes 15 parts and polyacetate 10 parts.

[0043] The main steps are divided into six steps, namely:

[0044] S1, 60 parts of deionized water and 8 parts of Ca(OH) 2 Add it into an ultrasonic mixer, vibrate with ultrasonic waves, and stir with a stirrer at the same time to obtain the first mixture. The stirring speed is 800r / min, the stirring time is 10min, and the frequency of the ultrasonic mixer is 28khz;

[0045] S2, heat up the solution obtained in S1, heat up to a certain temperature, stop the temperature rise, and stir at the same time, add 15 parts of conductive alkyne, 15 parts of acetylene black and 15 parts of carbon nanotubes while stirring, and stir to form a paste, to obtain the first For the second mixture, the temperature is raised to 50°C, the stirring speed is 800r / min, the stirring time is 15min, and the heating rate i...

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Abstract

The invention provides an oxide film removing method for lithium battery aluminum foils and belongs to the technical field of the oxide film removal of aluminum foils. The oxide film removing method for the lithium battery aluminum foils includes the following steps that: S1, 50 parts of deionized water and 6 parts of Ca(OH)2 are added into an ultrasonic mixer, a stirrer stirs the deionized waterand the Ca(OH)2, so that a first mixture can be obtained; step 2, the solution is stirred when being warmed, and 13 parts of conductive alkyne, 13 parts of acetylene black and 13 parts of carbon nanotubes are added into the solution when the solution is stirred, so that a second mixture is obtained; S3, the second mixture obtained in the S2 is heated when being stirred, and after the temperature of the second mixture rises to certain temperature, 7 parts of polyvinyl acetate is added into the second mixture, stirring is performed, so that a third mixture can be obtained; S4, the third productobtained in the S3 is cooled, so that a slurry is obtained; S5, the slurry is applied onto a gravure coating machine, and the slurry is applied onto an aluminum foil through the gravure coating machine; and S6, the aluminum foil coated with the slurry is dried. According to the oxide film removing method for the lithium battery aluminum foil, after the aluminum foil is treated, conductivity is improved, interface resistance is reduced, the low-temperature discharge capacity of a battery is improved, and the cycle life of the battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of deoxidizing film of aluminum foil, in particular to a method for deoxidizing film of aluminum foil of a lithium battery. Background technique [0002] Battery foil is used as a current collector for lithium-ion batteries. Typically, the lithium-ion battery industry uses rolled aluminum foil hot-rolled as the positive electrode for the negative electrode collector. Rolled foils vary in thickness from 10 to 50 microns. The 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] When the aluminum foil is placed in the air, the surface of the aluminum foil is prone to oxidation, and a layer of oxide film is formed after oxidation. This layer of oxide film seriously affects the conductivity of the aluminum foil. When making the aluminum foil of the battery, the aluminum foil must be remo...

Claims

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Application Information

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IPC IPC(8): H01M4/66
CPCH01M4/667Y02E60/10
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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