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Preparation method for microporous aluminum foil and microporous aluminum foil prepared by preparation method

An aluminum foil and microporous technology, which is applied in the field of lithium-ion batteries, can solve the problems of insignificant improvement in electronic conductivity, no improvement in ionic conductivity, and decreased mechanical strength of aluminum foil, so as to improve ionic conductivity, avoid unbalanced conductivity and Affects the mechanical properties of aluminum foil and improves the electronic conductivity

Inactive Publication Date: 2016-08-24
张升亮
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method does not significantly improve the electronic conductivity and does not improve the ionic conductivity.
Aluminum foil with micropores can increase the conductivity. The existing process of punching aluminum foil by physical methods can only produce millimeter-scale through holes on the one hand, resulting in a significant decrease in the mechanical strength of the aluminum foil; on the other hand, during the punching process Many metal burrs will be produced in the middle, which will bring serious safety hazards

Method used

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  • Preparation method for microporous aluminum foil and microporous aluminum foil prepared by preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of microporous aluminum foil, adopting the following steps:

[0024] (1) Add 21g of carbon nanotubes and 5g of polyvinylpyrrolidone into 1L of deionized water and mix evenly, use a grinder to grind for 180min, disperse to obtain a slurry, pass the slurry through a 100-mesh sieve, and set aside;

[0025] (2) Evenly coat the sieved slurry prepared in step (1) on an aluminum foil with a thickness of 5um, control the coating thickness to 10um, and dry the coating for 5min;

[0026] (3) Ultrasonic cleaning is performed on the coating layer dried in step (2) with cleaning agent water to obtain a clean microporous aluminum foil.

[0027] For the microporous aluminum foil prepared by the above microporous aluminum foil preparation method, use CCD to measure and characterize the pore diameter of the microporous aluminum foil obtained is 0.5-5um, the porosity is 5%, and the air permeability is 850s / 100cc.

Embodiment 2

[0029] A preparation method of microporous aluminum foil, adopting the following steps:

[0030] (1) Add 40g of acetylene black (carbon black), 5g of polyvinylpyrrolidone, and 15g of polyaspartic acid into 1L of deionized water and mix evenly, use a grinder to grind for 60min, disperse to obtain a slurry, and pass the slurry through 50 mesh sieve, spare;

[0031] (2) Evenly coat the sieved slurry prepared in step (1) on an aluminum foil with a thickness of 50 um, control the coating thickness to 5 um, and dry the coating for 60 min;

[0032] (3) Ultrasonic cleaning is performed on the coating layer dried in step (2) with water to obtain a clean microporous aluminum foil.

[0033] For the microporous aluminum foil prepared by the above microporous aluminum foil preparation method, the pore diameter of the obtained microporous aluminum foil is 50-300um, the porosity is 15%, and the air permeability is 350s / 100cc.

Embodiment 3

[0035] A preparation method of microporous aluminum foil, adopting the following steps:

[0036] (1) Add 21g of expanded graphite and 10g of polyaspartic acid into 1L of deionized water and mix evenly, use a grinder to grind for 600min, disperse to obtain a slurry, pass the slurry through a 300-mesh sieve, and set aside;

[0037] (2) Evenly coat the sieved slurry prepared in step (1) on an aluminum foil with a thickness of 27um, control the coating thickness to 15um, and dry the coating for 32min;

[0038] (3) ultrasonically cleaning the coating layer dried in step (2) with water to obtain a clean microporous aluminum foil.

[0039] For the microporous aluminum foil prepared by the above microporous aluminum foil preparation method, the microporous aluminum foil obtained has a pore diameter of 10-200um, a porosity of 12%, and an air permeability of 550s / 100cc.

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Abstract

The invention relates to the technical field of a lithium ion battery, and particularly to a preparation method for a microporous aluminum foil and the microporous aluminum foil prepared by the preparation method. The preparation method for the microporous aluminum foil comprises the following steps of (1) jointly adding 5-300g of reactant and a dispersing agent into 1L of solvent to be uniformly mixed, carrying out fine grinding by grinding equipment for 30-1,440min, and dispersing to obtain paste, and sieving the paste for use; (2) uniformly coating the aluminum foil with a thickness of 5-50[mu]m with the sieved paste obtained in the step (1), controlling the thickness of the coating layer to be 1-50[mu]m, and drying the coating layer for 5-60min; and (3) cleaning the coating layer on the aluminum foil obtained in the step (2) by a cleaning agent. The micropores on the surface of the microporous aluminum foil prepared by method are micron-scale in sizes and are uniformly distributed, so that unbalanced conductivity and the influence on the mechanical performance of the aluminum foil can be avoided; the surface roughness and the contact area of the aluminum foil can be effectively improved; the electron conductivity is greatly improved; and due to the existence of the micropores, the contact channel of the active materials is enlarged as well, so that the ion conductivity is improved consequently.

Description

(1) Technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of microporous aluminum foil and the microporous aluminum foil prepared by the method. (2) Background technology [0002] In recent years, affected by the deterioration of the global climate and human living environment and the energy crisis, people's interest in energy storage technology is increasing. Batteries are already commonly used as power sources for mobile phones, small camcorders, notebook computers, PCs, power tools and electric vehicles. In particular, electric vehicles have become a hot spot to reduce greenhouse gas emissions and solve vehicle energy problems. Therefore, the research and development of new energy batteries used in electric vehicles, especially power batteries, are becoming more and more in-depth and extensive in various countries around the world. . [0003] Since lithium secondary batteries have higher drivi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/80H01M4/04H01M10/0525
CPCH01M4/0402H01M4/80H01M10/0525Y02E60/10
Inventor 张升亮
Owner 张升亮
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