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Lithium ion battery of silicon negative electrode system

A lithium-ion battery, silicon negative electrode technology, applied in the direction of negative electrodes, battery electrodes, secondary batteries, etc., can solve the problem of silicon material expansion, affect the cycle performance of lithium-ion batteries, etc., achieve good energy density and cycle performance, improve Cycling performance, the effect of reducing volume expansion

Pending Publication Date: 2021-12-03
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, silicon materials have serious swelling problems during cycling, which affects the cycle performance of lithium-ion batteries.

Method used

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  • Lithium ion battery of silicon negative electrode system
  • Lithium ion battery of silicon negative electrode system
  • Lithium ion battery of silicon negative electrode system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The lithium-ion battery provided in this embodiment includes a positive electrode sheet and a negative electrode sheet, wherein:

[0048] The positive electrode sheet includes a positive electrode current collector aluminum foil and a positive electrode active layer arranged on two functional surfaces of the positive electrode current collector aluminum foil, the positive electrode active layer includes 97.6 parts by mass of lithium cobalt oxide, 1.3 parts by mass of a conductive agent (including carbon black carbon tubes, and The mass ratio of carbon black and carbon tube is 4:1), the binding agent PVDF of 1.1 mass parts;

[0049] The negative electrode sheet includes a negative electrode current collector copper foil and a first negative electrode active layer and a second negative electrode active layer that are sequentially stacked on the two functional surfaces of the negative electrode current collector copper foil;

[0050] The first negative electrode active lay...

Embodiment 2

[0056] The lithium-ion battery provided in this embodiment can refer to Embodiment 1, the difference is:

[0057] The first negative electrode active layer includes 96.4 parts by mass of negative electrode active material, 1.3 parts by mass of dispersant CMC-Na, 1.8 parts by mass of binder PAA and 0.5 parts by mass of conductive agent.

Embodiment 3

[0059] The lithium-ion battery provided in this embodiment can refer to Embodiment 1, the difference is:

[0060] The first negative electrode active layer includes 96.1 parts by mass of negative electrode active layer material, 1.3 parts by mass of dispersant CMC-Na, 2.1 parts by mass of binder PAA and 0.5 parts by mass of conductive agent.

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Abstract

The invention provides a lithium ion battery of a silicon negative electrode system, the lithium ion battery comprises a negative electrode plate, the negative electrode plate comprises a negative electrode current collector and a negative electrode active layer arranged on at least one functional surface of the negative electrode current collector, and the negative electrode active layer comprises a negative electrode active material and a binder; the negative electrode active material comprises a carbon material and a silicon material, and the D50 carbon of the carbon material, the D50 silicon of the silicon material, the mass m1 of the carbon material, the mass m2 of the silicon material and the thickness H of the negative electrode active layer meet a relational expression 1; and the mass of the binder is 0.9%-2.7% of the total mass of the negative electrode active layer. The lithium ion battery provided by the invention has relatively good energy density and cycle performance.

Description

technical field [0001] The invention relates to a lithium ion battery with a silicon negative electrode system, and relates to the technical field of secondary batteries. Background technique [0002] With the advent of the 5G era, the status of lithium-ion batteries is becoming more and more important. With the continuous development of lithium-ion battery-related technologies, the energy density and fast charging capabilities of lithium-ion batteries are getting closer and closer to the limit, which requires In order to seek new breakthroughs in technology, profound innovations must be made for the existing chemical systems. [0003] A conventional lithium-ion battery includes a positive electrode sheet, a negative electrode sheet and an electrolyte, the positive electrode sheet includes a positive electrode current collector and a positive electrode active layer, the negative electrode sheet includes a negative electrode current collector and a negative electrode active l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/133H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525
CPCH01M4/134H01M4/133H01M4/386H01M4/587H01M4/621H01M4/622H01M4/366H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 陈博彭冲李俊义韦世超
Owner ZHUHAI COSMX BATTERY CO LTD
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