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Lithium ion battery, negative electrode material, negative electrode filler and preparation process thereof

A negative electrode material and filler technology, applied in secondary batteries, battery pack parts, battery boxes/jackets, etc., can solve the problem of increased polarization of lithium-ion batteries, ensure rate performance, and reduce the generation of hydrofluoric acid , the effect of improving stability

Pending Publication Date: 2022-07-29
东莞凯德新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a lithium ion battery, negative electrode material, negative electrode filler and its preparation process to solve the problems of lithium ion battery polarization increase, rapid cycle attenuation and lithium analysis

Method used

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  • Lithium ion battery, negative electrode material, negative electrode filler and preparation process thereof
  • Lithium ion battery, negative electrode material, negative electrode filler and preparation process thereof
  • Lithium ion battery, negative electrode material, negative electrode filler and preparation process thereof

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preparation example Construction

[0054] In the above-mentioned preparation process of the negative electrode filler 10 of the negative electrode material, since the outer surface of the elastic casing film 100 is formed with a porous body 102, and the elastic casing film 100 is formed with a hollow cavity 104, when the lithium ion battery expands, The elastic shell film 100 of the negative electrode filler 10 is squeezed and shrunk, and the hollow cavity 104 of the elastic shell film 100 provides a buffer space for the expansion of the pole piece, so as to avoid affecting the overall thickness expansion of the pole piece, thereby ensuring the pole piece. The conductive network and bonding network of the sheet are not damaged, which improves the overall stability of the pole piece, and improves the stability, cycle performance, and service life of the lithium ion battery. Because the hole body 102 is connected with the hollow cavity 104, the electrolyte solution is It can enter the interior of the elastic shell...

Embodiment 1

[0065] The negative electrode filler 10 of 1% wt negative electrode material was added to the graphite negative electrode slurry to make a soft pack battery; cycle performance: 1000 retention rate was 80%, increased to 1000 retention rate of 90%, and the thickness expansion of the pole piece was reduced from 15% to 8%; high temperature performance: after 28 days of storage at 60°C, the remaining capacity retention rate increased from 88% to 93%.

Embodiment 2

[0067] The negative electrode filler 10 of 5% wt negative electrode material was added to the silicon carbon negative electrode slurry to make a soft pack battery; cycle performance: after 500 cycles of charge and discharge, the battery capacity was increased from 80% to 88%, extremely Sheet thickness expansion was reduced from 40% to 12%; high temperature performance: after 28 days of storage at 60°C, the residual capacity retention rate was increased from 81% to 90%.

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Abstract

The invention provides a lithium ion battery, a negative electrode material, a negative electrode filler and a preparation process thereof. The negative electrode filler of the negative electrode material comprises an elastic shell film and a conductive agent layer coated on the surface of the elastic shell film. A hole body is formed in the outer surface of the elastic shell membrane, a hollow cavity is formed in the elastic shell membrane, and the hole body is communicated with the hollow cavity. A water removal coating is formed on the inner wall of the elastic shell film. According to the negative electrode filler of the negative electrode material, the hole bodies are formed in the outer surface of the elastic shell membrane, and the hollow cavity is formed in the elastic shell membrane, so that when the lithium ion battery expands, the elastic shell membrane of the negative electrode filler is extruded and contracted, and the influence on the overall thickness expansion of a pole piece is avoided; the water removal coating is formed on the inner wall of the elastic shell film, so that the water in the negative electrode material can be effectively removed, the generation of hydrofluoric acid is reduced, the high-temperature performance, the cycle performance and the safety performance of the lithium ion battery are improved, and the service life of the lithium ion battery is prolonged.

Description

technical field [0001] The present invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery, a negative electrode material, a negative electrode filler and a preparation process thereof. Background technique [0002] The pole piece of lithium ion battery is composed of active material, binder and conductive agent layer. Due to the large expansion and contraction of the negative electrode material during the charging and discharging process, especially the silicon negative electrode material, the active material particles are broken, and the conductive network and the bonding network fail, which will eventually lead to increased battery polarization, cycle degradation and reduced service life, etc. question. The general method for improving the expansion of lithium-ion batteries is to form a coating structure on the surface of the negative electrode active material to form a core-shell structure. There is a certain space betwe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M50/10H01M50/124H01M50/131
CPCH01M10/0525H01M50/10H01M50/131H01M50/124H01M50/1243H01M50/1245
Inventor 高旭光徐宁吕伟霞
Owner 东莞凯德新能源有限公司
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