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Lithium battery pole piece, preparation method thereof and lithium battery

A lithium battery and pole piece technology is applied to the lithium battery pole piece and its preparation, and the field of lithium batteries, which can solve the problem that the preparation method needs to be improved, and achieve the effects of improving the reliability of the pole piece, improving the oxidizing property, and increasing the surface roughness.

Active Publication Date: 2019-05-31
昆山聚创新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the existing lithium battery pole piece and its preparation method still need to be improved.

Method used

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  • Lithium battery pole piece, preparation method thereof and lithium battery
  • Lithium battery pole piece, preparation method thereof and lithium battery
  • Lithium battery pole piece, preparation method thereof and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Prepare lithium battery negative electrode sheet according to the following steps:

[0065] (1) Coating a carbon-containing conductive layer on the copper foil surface, wherein the carbon-containing conductive layer is coated with a slurry comprising 60 parts of carbon black, 35 parts of styrene-butadiene rubber emulsion, 5 parts of polyvinyl chloride and 400 parts of deionized water formed on at least a part of the surface of the copper foil and cured.

[0066] (2) Perform microwave ultrasonic treatment or negative pressure vacuum treatment on the carbon-containing conductive layer and the foil materials on both sides.

[0067] (3) Corona treatment was performed on the carbon-containing conductive layer according to the following conditions: the power of the corona processor was 10 kW, the distance between the corona treatment and the carbon-containing conductive layer was 1 mm, and the corona treatment time was 0.5 s.

[0068] (4) Coating the negative electrode slurr...

Embodiment 2

[0070] The lithium battery negative electrode sheet was prepared in the same manner as in Example 1, except that in step (3), the power of the corona processor was 5kW.

Embodiment 3

[0072] The lithium battery negative electrode sheet was prepared in the same manner as in Example 1, except that in step (3), the power of the corona processor was 20 kW.

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PUM

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Abstract

The invention discloses a lithium battery pole piece, a preparation method thereof and a lithium battery. The preparation method of the lithium battery pole piece comprises the steps that (1) a carboncontained conducting layer is formed in at least part of the surface of a current collector; (2) the carbon contained conducting layer is activated; and (3) an electrode slurry is applied to the activated carbon contained conducting layer to obtain the lithium battery pole piece. According to the method, the carbon contained conducting layer in the pole piece is activated to improve a bonding force between the carbon contained conducting layer and the electrode slurry substantially, and a high-quality lithium battery pole piece is obtained.

Description

technical field [0001] The invention relates to the battery field, in particular, the invention relates to a lithium battery pole piece, a preparation method thereof, and a lithium battery. Background technique [0002] Lithium-ion power batteries have higher requirements on the energy density, cycle stability and rate performance of the battery, but there are still some defects in the lithium-ion batteries currently on the market, such as the poor binding force between the active material and the current collector. Accompanied by the more serious 5S problem and the decrease in battery capacity and poor capacity consistency due to the reduction of active materials in the pole piece, and with the increase in the number of cycles during the use of the battery, the coating layer of the active material is easy to be removed from the collection. The fluid falls off, resulting in poor cycle performance of the battery. [0003] Aiming at the problem of powder falling caused by poo...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/131H01M4/139H01M10/0525
CPCY02E60/10
Inventor 刘冯新李奎刘璋勇杨重科张金涛
Owner 昆山聚创新能源科技有限公司
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