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Method for preparing lithium ion battery porous copper foil current collector

A lithium-ion battery and porous copper technology, applied in the field of electrochemistry, can solve the problems that cannot meet the performance requirements of the current collector of lithium-ion batteries, the structure of porous metal materials is loose, and the thickness of copper foil cannot be accurately controlled. The effect of uniform material structure and high density

Inactive Publication Date: 2018-07-06
TAIYUAN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the porous metal materials prepared by these two methods have loose structures, low yield strength, and the thickness of copper foil cannot be precisely controlled, so they cannot meet the performance requirements of lithium-ion battery current collectors.

Method used

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  • Method for preparing lithium ion battery porous copper foil current collector
  • Method for preparing lithium ion battery porous copper foil current collector
  • Method for preparing lithium ion battery porous copper foil current collector

Examples

Experimental program
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Embodiment 1

[0028] A method for preparing a lithium-ion battery porous copper foil current collector provided by the present invention includes: S1, preparing a polymer porous film microemulsion: using 6 mg / ml polystyrene as a polymer, 0.07 mg / ml double twelve Alkyl dimethyl ammonium bromide is used as a surfactant, dichloromethane is used as a solvent to prepare a polymer organic solution, and the solution is mixed with twice distilled water at a volume ratio of 20:1, and the mixed solution is shaken until it is slightly milky white, forming Water-in-oil microemulsion for later use;

[0029] S2. Preparation of porous copper foil: use calendered pure copper foil with a thickness of 15 μm as raw material, soak in NaOH solution with a concentration of 30g / L for 2 minutes to remove rolling oil on the surface of copper foil, and wash with twice distilled water to remove residual NaOH solution , and then in the concentration of 50g / L H 2 SO 4 Soak in the solution for 2 minutes to remove resi...

Embodiment 2

[0036] S1. Preparation of polymer porous membrane microemulsion: using 6mg / ml polystyrene as polymer, 0.07mg / ml didodecyldimethylammonium bromide as surfactant, and dichloromethane as solvent. Polymer organic solution, the solution is mixed with double distilled water at a volume ratio of 100:1, the mixed solution is shaken until it is slightly milky white, and the water-in-oil microemulsion is formed for subsequent use;

[0037] S2, preparing porous copper foil:

[0038] S2.1. Prepare a clean copper foil base; use 15 μm thick rolled pure copper foil as raw material, soak it in NaOH solution with a concentration of 50g / L for 3 minutes to remove the rolling oil on the surface of the copper foil, and wash and remove it with twice distilled water The residual NaOH solution, and then in the concentration of 80g / L H 2 SO 4 Soak in the solution for 3 minutes to remove residual oxides on the surface of copper foil, and then wash with double distilled water to remove residual H 2 S...

Embodiment 3

[0044] S1. Preparation of polymer porous membrane microemulsion: using 6mg / ml polystyrene as polymer, 0.07mg / ml didodecyldimethylammonium bromide as surfactant, and dichloromethane as solvent. Polymer organic solution, the solution is mixed with twice-distilled water at a volume ratio of 20:1, and the mixed solution is shaken until it is slightly milky white, forming a water-in-oil microemulsion for subsequent use;

[0045] S2, preparing porous copper foil:

[0046] S2.1. Prepare a clean copper foil substrate; use a rolled pure copper foil with a thickness of 15 μm as a raw material, soak it in a NaOH solution with a concentration of 45g / L for 3 minutes to remove the rolling oil on the surface of the copper foil, and wash it with double distilled water to remove it Residual NaOH solution, and then in the concentration of 75g / L H 2 SO 4 Soak in the solution for 3 minutes to remove residual oxides on the surface of copper foil, and then wash with twice distilled water to remov...

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Abstract

The invention discloses a method for preparing a lithium ion battery porous copper foil current collector, and belongs to the field of an electrochemical technique. The method comprises the followingsteps of S1, preparing a porous polymer membrane microemulsion; S2.1, preparing a clean copper foil substrate; S2.2, casting the microemulsion prepared in the step S1 onto the clean copper foil substrate, soaking a copper foil coated with a porous polymer membrane into a corrosive liquid for 3 to 6 minutes, and obtaining a porous copper foil; S3.1, electrolytic degreasing the prepared porous copper foil in a degreasing tank; S3.2, feeding the porous copper foil into a nickel-cobalt plating tank, carrying out Ni-Co electroplating, feeding the porous copper foil into a zinc-plating tank, and plating Zn on the surface; then carrying out surface Cr-plating treatment and surface silane coupling treatment; obtaining the lithium ion battery porous copper foil current collector. According to the method for preparing the lithium ion battery porous copper foil current collector provided by the invention, the preparation method is simple in process, the material is uniform in structure, high in compactness and continuously adjustable in hole diameter, and the physical quantities such as the yield strength, the hardness and the Young modulus are increased along with the reduction of the hole diameter size.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a method for preparing a porous copper foil current collector for a lithium ion battery. Background technique [0002] Copper foil refers to a copper thin film material with a thickness of less than 0.2mm. Copper foil has the characteristics of good electrical conductivity, soft texture, mature manufacturing technology, and relatively low price. It has become the material of choice for the negative electrode collector of lithium-ion batteries. According to the working principle and structural design of the lithium-ion battery, the slurry of active materials such as graphite and petroleum coke is coated on the conductive current collector to form the negative electrode of the lithium-ion battery. However, due to the limitations of the coating process and the inhomogeneity of the inner and outer surfaces of the copper foil current collector, the performance of the inner an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/80H01M10/0525H01M10/058
CPCH01M4/139H01M4/80H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 梁红玉贺秀丽白瑞翟艳梁淑君
Owner TAIYUAN INST OF TECH
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