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A method for changing the surface morphology of lithium battery current collector copper foil

A technology of surface morphology and current collectors, applied in battery electrodes, electrode carriers/current collectors, circuits, etc., can solve the problems of harsh process conditions, high preparation costs, and complex preparation processes.

Inactive Publication Date: 2021-09-07
HEBEI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Physical methods have high requirements on equipment, harsh process conditions and high preparation costs
However, the chemical method uses many raw materials, the preparation process is complicated, and the mass production quality is unstable.

Method used

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  • A method for changing the surface morphology of lithium battery current collector copper foil
  • A method for changing the surface morphology of lithium battery current collector copper foil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Prepared at a concentration of 80 g / L sulfuric acid solution, and then adding a certain amount of copper sulfate, the concentration of copper sulfate of 200g / L, the solution was taken in 50mL beaker and then added 2mL of 1-butyl-3-methylimidazole chloride and stir. The copper foil is placed in the solution, and after soaking 10min, extracted with distilled water wash, the copper foil surface topography can be obtained changes.

[0018] figure 1 The original copper foil (picture a) and SEM images after changing the foil surface (image b) two times amplified morphology. As can be seen from the figure, the more smooth the surface of the original copper foil, and after soaking the copper foil surface there are many irregular particle generation, and there are many voids appear, showing the uneven surface topography, roughness increased significantly.

[0019] figure 2 Raw material for the copper foil surface (spectrum a) and change the copper foil surface material (patter...

Embodiment 2

[0021] Prepared at a concentration of 50 g / L sulfuric acid solution, and then adding a certain amount of copper sulfate, the concentration of copper sulfate of 150g / L, the solution was taken in 50mL beaker was added 1,3-dimethyl-imidazole chloride 2.0mL of salt and stir. The copper foil is placed in the solution, and after soaking 20min, extracted with distilled water wash, to change the surface topography can be obtained copper foil.

Embodiment 3

[0023] Prepared at a concentration of 80 g / L sulfuric acid solution, and then adding a certain amount of copper sulfate, the concentration of copper sulfate of 150g / L, the solution was taken in 50mL beaker was added 1mL of 1-benzyl-2-chloromethyl- imidazolium chloride and stir. The copper foil is placed in the solution, and after soaking 25min, extracted with distilled water wash, to change the surface topography can be obtained copper foil.

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Abstract

The invention discloses a method for changing the surface morphology of copper foil of a lithium battery current collector. The main steps are as follows: first prepare a copper sulfate solution containing sulfuric acid, then put the above 50mL solution in a beaker, then add 0.5-2.5mL of a certain ionic liquid, and stir evenly. Put the copper foil in the solution, soak it for 5 minutes to 30 minutes, take it out and wash it with distilled water, and then you can get the copper foil with changed surface morphology. The conditions used in the present invention are very mild, and without adding other strong oxidizing agents or strong reducing agents, the surface of copper foil can be improved at normal temperature and pressure to form an orderly concave-convex surface morphology. The change in morphology improves the performance of lithium batteries.

Description

Technical field [0001] The present invention relates to a method for improving the performance of lithium batteries, in particular a lithium battery current collector foil by changing the surface morphology, thereby increasing performance lithium battery, a material belonging to the technical field of energy. Background technique [0002] A lithium ion battery, also referred to as lithium batteries. As a new type of clean energy, with a stable operating voltage, long cycle life, safety, rapid charging, etc., it has been widely used in mobile phones, laptop computers, digital cameras and other electronic devices. In a lithium battery, the current collector is a copper foil negative electrode material, its main role is the transmission current negative active material generated during discharge, and the charging current when the active material to the negative electrode of the external power transmission. However, due to the copper foil surface is very smooth, so that the negative ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/1395H01M4/66C23F1/18
CPCY02E60/10
Inventor 丁克强曲润玲赵棉杨胜杰韩静玮高晓静周兰俊
Owner HEBEI NORMAL UNIV