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Current collector aluminum foil surface texture rolling method

A current collector and texture technology, applied in electrode rolling/calendering, electrode manufacturing, electrochemical generators, etc., can solve the problems that cannot meet the use requirements of aluminum foil, achieve good mechanical properties, good groove depth consistency, Avoid local thinning effects

Inactive Publication Date: 2018-08-17
INST OF MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, the existing methods of roughening the surface of aluminum foil cannot meet the requirements for the use of aluminum foil as a current collector and must be optimized

Method used

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  • Current collector aluminum foil surface texture rolling method
  • Current collector aluminum foil surface texture rolling method
  • Current collector aluminum foil surface texture rolling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The 1235 aluminum foil with a thickness of 16 μm is selected for double-sided texture rolling. The rolling process only replicates the surface texture of roll 1 without changing the average thickness of aluminum foil 2. The height of the annular bead 31 of the independent circular unit 3 on the surface of the roll 1 is between 6 and 7 μm, and the depth of the central pit 32 of the independent circular unit 3 on the surface of the roll 1 is between 6 and 7 μm. The diameter 33 of the independent circular unit 3 is 70 μm, the center distance 5 of the independent circular unit 3 on the surface of the roll 1 is 70 μm, the edges of the independent circular unit 3 on the surface of the roll 1 are tangent, and the surface roughness Ra of the roll 1 is 2.6 Between ~2.7 μm, the dispersion coefficients of the height of the annular bead 31 on the surface of the roll 1 and the roughness Ra are both less than 0.1.

[0044] The surface shape of the aluminum foil raw material is as fol...

Embodiment 2

[0046] The 1235 aluminum foil with a thickness of 16 μm is selected for double-sided texture rolling. The rolling process only replicates the surface texture of roll 1 without changing the average thickness of aluminum foil 2. The height of the edge annular bead 31 of the independent circular unit 3 on the surface of the roll 1 is between 4 and 5 μm, the depth of the central pit 32 of the independent circular unit 3 on the surface of the roll 1 is between 5 and 6 μm, and the surface of the roll 1 The diameter of the independent circular unit 3 is 70 μm, the center distance 5 of the independent circular unit 3 on the surface of the roll 1 is 90 μm, the edges of the circular unit 3 on the surface of the roll 1 are separated, and the surface roughness Ra of the roll 1 is between 1.5 and 1.6 μm, the coefficient of dispersion of the height of the annular bead on the surface of the roll 1 and the surface roughness Ra is less than 0.1.

[0047] The surface shape of aluminum foil 2 af...

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Abstract

The invention provides a current collector aluminum foil texture rolling method which comprises the following steps of step 100, utilizing a pulse laser for roughening a roller surface, and forming atexture shape formed by distributing and arranging independent circular units on the roller surface; and step 200, preparing an aluminum foil to be rolled, and copying the texture shape of the rollersurface to an aluminum foil surface through a rolling process. According to the current collector aluminum foil texture rolling method provided by the invention, the circular units are centrosymmetric, so that through controlling the distribution of the circular units, better surface roughness isotropy can be obtained. Extrudates on the aluminum foil surface concentratedly form bulges, so that a better 'mortise and tenon' connecting effect is achieved, and a coating adhesion property is higher. Through an aluminum foil rolling production method, the extrudates of foundation pits on the aluminum foil surface are completely converted into the bulges, so that no material loss is caused, and a better mechanical property is realized compared with an etching aluminum foil. The depths of the foundation pits on the aluminum foil surface are good in consistency, so that the local part of the aluminum foil can be prevented from being thinned, and a better mechanical property is realized comparedwith an existing roughly rolled aluminum foil.

Description

technical field [0001] The invention belongs to the field of batteries, in particular to a surface texture rolling method for current collector aluminum foil used in lithium ion batteries and double-layer capacitors. Background technique [0002] Aluminum foil is used as a current collector for lithium ion batteries and electric double layer capacitors. In lithium-ion batteries, the surface of aluminum foil is coated with a coating containing positive active materials to form the positive electrode. The adhesion between the coating and the current collector affects the internal resistance, high-rate discharge performance and cycle life of the battery. In order to improve the adhesion between the current collector and the coating, the surface of the aluminum foil is usually roughened to increase the contact area between the two. In electric double layer capacitors, the surface of the current collector aluminum foil also needs to be coated with a coating containing porous car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D33/00H01M4/04H01M10/0525
CPCB21D33/00H01M4/0435H01M10/0525Y02E60/10
Inventor 王之桐
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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