Negative pole piece, electrochemical device comprising negative pole piece and electronic device

A technology of negative pole piece and negative material layer, which is applied in the field of electrochemistry to achieve the effects of improving cycle performance, improving interface stability, and improving expansion and deformation

Active Publication Date: 2022-01-18
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present application is to provide a negative electrode sheet, an electrochemical device and an electronic device including the negative electrode sheet, so as to improve the cycle performance and expansion deformation of the electrochemical device

Method used

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  • Negative pole piece, electrochemical device comprising negative pole piece and electronic device
  • Negative pole piece, electrochemical device comprising negative pole piece and electronic device
  • Negative pole piece, electrochemical device comprising negative pole piece and electronic device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096]

[0097] Put a porous carbon material with a porosity of 41% in a closed silicon-containing gas reactor, heat it to 500°C and keep it warm for 4 hours, and after cooling, sieve and demagnetize to obtain the porosity α of silicon-based particles 1 30% silicon-based particles. Among them, the carbon content of the silicon-based particles is 60wt%, the silicon content B in the silicon-based particles is 40wt%, the distance is 0.04 μm, and the average particle diameter Dv50 of the silicon-based particles is 7.6 μm.

[0098]

[0099] Mix the negative electrode active material, graphite particles and nano conductive carbon black prepared above according to the mass ratio of 30:66.5:3.5 to obtain the first mixture; add the first mixture and the binder PAA into deionized water according to the mass ratio of 95:5 , prepared into a slurry with a solid content of 45%, and stirred evenly to obtain the first mixed slurry; the first mixed slurry was uniformly coated on one surfac...

Embodiment 2、 Embodiment 3

[0109] Example 2, Example 3, Example 4, Example 5, Example 6, Example 7, Example 8, Example 9, Example 10, Example 11, Example 12, Example 13, Example 14. In Example 15, Example 16, Example 17, Example 18, Example 19, Example 20, and Example 21, , , , , and are all the same as in Example 1, and the changes in relevant preparation parameters are shown in Table 1:

[0110] Table 1

[0111]

Embodiment 22

[0113]

[0114] 1) Put a porous carbon material with a porosity of 41% in a closed silicon-containing gas reactor, heat it to 500°C and keep it warm for 4 hours, and after cooling, sieve and demagnetize to obtain the porosity α of silicon-based particles 1 It is 30% silicon-based particles, wherein the carbon content of the silicon-based particles is 60wt%, and the silicon content B in the silicon-based particles is 40wt%. The distance is 0.08 μm, and the average particle diameter Dv50 of silicon-based particles is 7.6 μm.

[0115] 2) Add the silicon-based particles obtained in 1) to single-walled carbon nanotubes (SCNT) containing carboxymethylcellulose sodium (CMC-Na) dispersant and disperse for 2 hours until a uniform mixed solution is formed, and spray dry to obtain powder, crushed, and sieved with 400 meshes to obtain the negative electrode material, wherein the mass percentage of silicon-based particles: SCNT: sodium carboxymethyl cellulose is 99.75:0.1:0.15.

[0116]...

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Abstract

The invention provides a negative pole piece, an electrochemical device comprising the negative pole piece and an electronic device comprising the negative pole piece. The negative pole material layer of the negative pole piece comprises silicon-based particles and graphite particles. In the silicon-based particles with the particle size larger than 3 microns, the Si content of the surface area is smaller than the Si content of the internal area, so that the surface stress of the negative pole piece is reduced. The interface stability of silicon-based particles and electrolyte is improved, so that the problems of cycle performance and expansion deformation of an electrochemical device are effectively solved.

Description

technical field [0001] The present application relates to the field of electrochemistry, and specifically relates to a negative electrode sheet, an electrochemical device and an electronic device including the negative electrode sheet. Background technique [0002] Lithium-ion secondary batteries have the advantages of high energy storage density, high open circuit voltage, low self-discharge rate, long cycle life, and good safety. They are widely used in various fields such as electric energy storage, mobile electronic equipment, electric vehicles, and aerospace equipment. With the rapid development of mobile electronic devices and electric vehicles, the market has put forward higher and higher requirements for the energy density, safety, cycle performance and service life of lithium-ion secondary batteries. [0003] Since the theoretical capacity of silicon-based materials reaches 4200mAh / g, it is currently known as the negative electrode material with the highest theoreti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/38
CPCH01M4/13H01M4/386H01M4/38Y02E60/10
Inventor 廖群超
Owner NINGDE AMPEREX TECH
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