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Lithium ion battery of silicon negative electrode system

A lithium-ion battery, silicon anode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems affecting the cycle performance of lithium-ion batteries, the expansion of silicon materials, etc., to achieve good energy density and cycle performance, improve cycle performance performance, the effect of relieving volume expansion

Active 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

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

[0040] The lithium-ion battery provided in this embodiment includes a positive electrode sheet and a negative electrode sheet, wherein:

[0041] 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 binder PVDF of 1.1 mass parts;

[0042] 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,

[0043] The first negative electrode active layer comp...

Embodiment 2

[0051] The lithium-ion battery provided in this embodiment can refer to Embodiment 1, the difference is:

[0052] The negative electrode active material in the first negative electrode active layer includes graphite and silicon, and the mass ratio of graphite to silicon is 96:4.

[0053] Calculations and tests were performed in the same manner as in Example 1, M=1.13, and the content of oxygen in the graphite was 5.7%.

[0054] In the first negative electrode active layer provided in this embodiment, the average number of silicon particles in the thickness direction of the first negative electrode active layer is 4.52, and the average number of particles per 20 μm*20 μm area is 1.51.

Embodiment 3

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

[0057] The negative electrode active material in the first negative electrode active layer includes graphite and silicon, and the mass ratio of graphite to silicon is 94:6.

[0058] Calculations and tests were performed in the same manner as in Example 1, M=1.62, and the content of oxygen in the graphite was 8.3%.

[0059] In the first negative electrode active layer provided in this embodiment, the average number of silicon particles in the thickness direction of the first negative electrode active layer is 6.48, and the average number of particles per 20 μm*20 μm area is 2.16.

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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 a negative electrode active material in the negative electrode active layer comprises a carbon material and a silicon material. By controlling the relationship between the particle sizes and the mass ratio of the carbon material and the silicon material and the thickness of the negative electrode active layer and the content of the oxygen element in the carbon material, the volume expansion of the silicon material is relieved and the structural stability of the carbon material is considered, so that the lithium ion battery 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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IPC IPC(8): H01M10/0525H01M4/36H01M4/38
CPCH01M10/0525H01M4/364H01M4/386H01M4/38Y02E60/10
Inventor 陈博彭冲李俊义韦世超
Owner ZHUHAI COSMX BATTERY CO LTD
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