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A kind of method for preparing porous copper foil current collector of lithium ion battery

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

Inactive Publication Date: 2020-11-03
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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  • A kind of method for preparing porous copper foil current collector of lithium ion battery
  • A kind of method for preparing porous copper foil current collector of lithium ion battery
  • A kind of method for preparing porous copper foil current collector of lithium ion battery

Examples

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Effect test

Embodiment 1

[0026] 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;

[0027] 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 30 g / L for 2 minutes to remove rolling oil on the surface of copper foil, and wash with double 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 re...

Embodiment 2

[0034]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;

[0035] S2, preparing porous copper foil:

[0036] 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 twice distilled water to remove residual H 2 SO ...

Embodiment 3

[0042] 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;

[0043] S2, preparing porous copper foil:

[0044] 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 double distilled water to remo...

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Abstract

The invention discloses a method for preparing a porous copper foil current collector of a lithium ion battery, belonging to the technical field of electrochemistry. The method is as follows: S1, preparing polymer porous membrane microemulsion: S2.1, preparing a clean copper foil substrate; S2.2, casting the microemulsion prepared in step S1 on a clean copper foil substrate, and applying The copper foil coated with the polymer porous film is immersed in the corrosive solution for 3-6 minutes to obtain the porous copper foil; S3.1, the prepared porous copper foil is electrolytically degreased in a degreasing tank; S3.2, the porous copper foil is soaked in nickel-cobalt The plating tank is subjected to Ni-Co electroplating, and then enters the galvanizing tank for Zn plating on the surface; then performs surface Cr plating treatment and surface silane coupling treatment; and obtains the porous copper foil current collector of the lithium ion battery. The preparation method of the invention has simple process, uniform material structure, high density, continuously adjustable aperture, yield strength, hardness, Young's modulus and other physical quantities increase with the decrease of aperture 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 Patents(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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