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Current collector, pole piece, lithium battery and preparation method of pole piece

A current collector and pole piece technology, applied in the field of lithium batteries, can solve the problems of hindering lithium battery capacity or energy density, increase the thickness of pole pieces, etc., and achieve the effect of making up for irreversible capacity loss

Pending Publication Date: 2020-08-14
创普斯(深圳)新能源科技集团有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the second method, the increased lithium-supplementing material layer will increase the thickness of the pole piece, reduce the number of pole pieces per unit volume, and still hinder the improvement of lithium battery capacity or energy density.

Method used

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  • Current collector, pole piece, lithium battery and preparation method of pole piece

Examples

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Effect test

preparation example Construction

[0040] The preparation method of the above pole piece comprises the following process:

[0041] The first surface and the second surface of the current collector 10 are covered with a protective film. The protective film may be a PE film, and the thickness of the PE film may be 0.1mm˜0.5mm.

[0042] Laser processing technology is used to process the first blind hole 12 and the second blind hole 14 on the first surface and the second surface respectively.

[0043]Put the lithium-supplementing additive slurry in the first blind hole 12 and the second blind hole 14 , and dry to fix the lithium-supplementing additive slurry in the first blind hole 12 and the second blind hole 14 . The lithium supplement additive slurry is prepared by mixing the lithium supplement additive, a binder and a solvent. The binder may be polyvinylpyrrolidone or the like, and the solvent may be ethanol or the like. The lithium-supplementing additive slurry is coated or sprayed into the first blind hole ...

Embodiment 1

[0049] Using aluminum foil as the current collector, the thickness of the aluminum foil is 14μm, using PE film as the protective film, the thickness of the PE film is 0.1mm, covering both sides of the aluminum foil with PE film, using laser technology to make aluminum foil with PE film It has a structure with double-sided blind holes, the depth of which is 80% of the thickness of the aluminum foil, and the diameter d of both-sided blind holes is 20 μm. The projection of the blind hole of the second surface on the first surface does not overlap with the blind hole of the first surface, and the projection of the blind hole of the second surface on the first surface is located at the center of the equilateral triangle of the first surface, such as figure 1 shown. The distance L between adjacent blind holes is 30 μm, and the total area of ​​the blind holes on the first surface is equal to the total area of ​​the blind holes on the second surface.

[0050] Will Li 5 FeO 4 , poly...

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Abstract

The embodiment of the invention discloses a current collector, a pole piece, a lithium battery and a preparation method of the pole piece, the current collector is provided with a first surface and asecond surface, the first surface is provided with first blind holes, and the second surface is provided with second blind holes, wherein the first blind holes and the second blind holes are uniformlydistributed, lithium supplementing additives are loaded in the first blind holes and the second blind holes, and the current collector is further prepared into the pole piece and the lithium battery.According to the invention, the irreversible capacity loss of the lithium battery in the first charging and discharging process can be compensated, and the improvement of the battery capacity or energy density is not hindered.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, and more specifically, to a current collector, a pole piece, and a method for preparing the lithium battery and the pole piece. Background technique [0002] With the gradual increase in people's requirements for the mileage of electric vehicles and the use time of 3C products (collectively referred to as computers, communications and consumer electronics), the market has put forward higher requirements for the energy density of lithium-ion batteries. . Silicon-based anode materials are expected to become the main anode materials for improving the energy density of lithium batteries due to their high specific capacity (about 4200mAh / g). However, the initial efficiency of silicon-based negative electrode materials (Si, SiOX) is low, and the initial efficiency of some SiOX is only about 70%, and the formed SEI (solid electrolyte interphase, solid electrolyte interface) film is unstable a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/70H01M4/80H01M10/0525H01M10/42
CPCH01M4/70H01M4/80H01M4/667H01M10/0525H01M10/4235Y02E60/10
Inventor 范兵王高峰王振峰章涵杨晓伟
Owner 创普斯(深圳)新能源科技集团有限公司
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