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Lithium ion battery silicon-based negative material and preparation method thereof

A silicon-based negative electrode material and lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of rapid volume change and capacity attenuation, and achieve the effect of simple and environmentally friendly process routes, good stability, and weakened volume effects

Inactive Publication Date: 2013-08-07
中国东方电气集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims to solve the problem of rapid capacity decay caused by large volume changes during the charging and discharging process of the existing lithium-ion battery silicon negative electrode material, and provides a lithium-ion battery silicon-based negative electrode material with large specific capacity and stable cycle

Method used

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  • Lithium ion battery silicon-based negative material and preparation method thereof
  • Lithium ion battery silicon-based negative material and preparation method thereof

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Effect test

Embodiment 1

[0037] A silicon-based negative electrode material for a lithium-ion battery, characterized in that: the silicon-based negative electrode material for a lithium-ion battery is made of silicon monoxide, the macroscopic particle size is 10 μm, and the microscopic structure is nano-silicon particles coated with silicon dioxide , The internal silicon particle size is 20nm.

[0038] The above-mentioned negative electrode material has an initial discharge capacity of 2010mAh / g at a rate of 0.1C, and 420mAh / g after 50 cycles.

Embodiment 2

[0040] A silicon-based negative electrode material for a lithium-ion battery, characterized in that: the silicon-based negative electrode material for a lithium-ion battery is made of silicon monoxide, the macroscopic particle size is 25 μm, and the microscopic structure is nano-silicon particles coated with silicon dioxide , The internal silicon particle size is 30nm.

[0041] The above-mentioned negative electrode material has an initial discharge capacity of 2640mAh / g at a rate of 0.1C, and 790mAh / g after 50 cycles.

Embodiment 3

[0043]A silicon-based negative electrode material for lithium-ion batteries, characterized in that: the silicon-based negative electrode material for lithium-ion batteries is made of silicon monoxide, the macroscopic particle size is 18 μm, and the microscopic structure is nano-silicon particles coated with silicon dioxide , The internal silicon particle size is 25nm.

[0044] The above-mentioned negative electrode material has an initial discharge capacity of 2325mAh / g at a rate of 0.1C, and 605mAh / g after 50 cycles.

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Abstract

The invention relates to a lithium ion battery silicon-based negative material and a preparation method thereof, which belong to the technical field of lithium ion battery negative materials. The lithium ion battery silicon-based negative material is prepared from silicon monoxide; the macroscopic particle diameter of the negative material is 10-25 micrometers; according to a microstructure, the negative material is composed of nanometer silicon particles covered with silica; the internal silicon particle diameter of the negative material is 20-30 nanometers; and at 0.1C discharge rate, the first discharge capacity of the negative material reaches 2010-2640 mAh / g, and is 420-790 mAh / g after 50 cycles. The negative materials with the structure characteristic combines the dispersion and the reduction of silicon particles; and on one hand, the silicon particles can be dispersed by a pore channel structure of silica so as to provide a space for the expansion of silicon in charge and discharge processes, on the other hand, the particle diameter of silicon can be reduced, and therefore, a volume effect of silicon in the charge and discharge processes can be weakened.

Description

technical field [0001] The invention relates to a lithium-ion battery negative electrode material and a preparation method thereof. More specifically, the invention relates to a lithium-ion battery silicon-based negative electrode material and a preparation method thereof, belonging to the technical field of lithium-ion battery negative electrode materials. Background technique [0002] With the gradual depletion of fossil fuels and the global warming it brings, the new energy industry has gradually attracted the attention of many researchers. Lithium-ion batteries have the advantages of high energy density, low self-discharge rate and environmental protection, so they are widely used as batteries for digital products and electric vehicles, and are research hotspots in the field of new energy. [0003] Graphite is a widely used anode material for lithium-ion batteries. It has the advantages of good cycle performance and a wide range of sources, but its theoretical capacity i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/134H01M4/1391H01M4/1395
CPCY02E60/122Y02E60/10
Inventor 王增竹王瑨谢皎郑威
Owner 中国东方电气集团有限公司
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