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Carbon-silicon-tin compound negative electrode material and preparation method thereof

A negative electrode material and composite material technology, applied in the field of carbon-silicon-tin composite negative electrode material and its preparation, can solve the problems of peeling, poor conductivity, volume expansion, etc., to prevent separation and pulverization, avoid volume increase, and ensure close contact Effect

Active Publication Date: 2021-04-09
河南电池研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicon is a semiconductor, and its conductivity is poor. In addition, the volume of silicon expands severely during the cycle, which leads to electrode pulverization, and even makes it peel off from the current collector, resulting in rapid capacity decay.
The specific capacity of tin is also high, 994mAh / g, good electrical conductivity, but there is also a certain volume expansion

Method used

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  • Carbon-silicon-tin compound negative electrode material and preparation method thereof
  • Carbon-silicon-tin compound negative electrode material and preparation method thereof
  • Carbon-silicon-tin compound negative electrode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] Preparation of carbon-silicon-tin composite anode materials

[0030]Step 1, soak silicon oxide with a particle size D50 of 2 μm in a hydrofluoric acid solution with a mass concentration of 25%, wherein the mass ratio of silicon oxide to hydrofluoric acid solution is 1:10; stir at room temperature for 2 hours, filter , the filter cake was washed with distilled water until neutral, and dried at 80°C to obtain a honeycomb silicon-based material;

[0031] Step 2, mix stannous chloride and water at a mass ratio of 1:10, and slowly add 0.01mol / L hydrochloric acid dropwise under stirring until clarification;

[0032] Step 3: add the honeycomb silicon-based material obtained in Step 1 into the solution prepared in Step 2 and completely immerse it, and stir for 3 hours; slowly add dropwise an ammonia solution with a mass concentration of 30%, so that the pH of the solution is 8, and continue stirring for 3 hours;

[0033] Step 4: filter with suction, wash the filter cake until ...

Embodiment 2

[0046] 1. Preparation of carbon-silicon-tin composite anode materials

[0047] Step 1, the particle size D 50 Soak silicon oxide with a thickness of 0.5 μm in a hydrofluoric acid solution with a mass concentration of 5%, wherein the mass ratio of silicon oxide to hydrofluoric acid solution is 1:5; stir at room temperature for 0.5 h, filter, and use distilled water for the filter cake Wash until neutral, and dry at 40°C to obtain a honeycomb silicon-based material;

[0048] Step 2, mix stannous chloride and water at a mass ratio of 1:10, and slowly add 0.01mol / L hydrochloric acid dropwise under stirring until clarification;

[0049] Step 3: Add the honeycomb silicon-based material obtained in Step 1 into the solution prepared in Step 2 and completely immerse it, and stir for 3 hours; slowly add dropwise an ammonia solution with a mass concentration of 50%, so that the pH of the solution is 4, and continue stirring for 5 hours;

[0050] Step 4: filter with suction, wash the fi...

Embodiment 3

[0056] 1. Preparation of carbon-silicon-tin composite anode materials

[0057] Step 1, the particle size D 50 Nano-silicon with a diameter of 100nm is soaked in hydrofluoric acid solution with a mass concentration of 5%, wherein the mass ratio of nano-silicon to hydrofluoric acid solution is 1:10; stir at room temperature for 0.5h, filter, and wash the filter cake with distilled water to medium properties, drying at 60°C to obtain a honeycomb silicon-based material;

[0058] Step 2, mix stannous chloride and water at a mass ratio of 1:50, and slowly add 0.01mol / L hydrochloric acid dropwise under stirring until clarification;

[0059] Step 3: add the honeycomb silicon-based material obtained in Step 1 into the solution prepared in Step 2 and completely immerse it, and stir for 0.5 h; slowly add dropwise an ammonia solution with a mass concentration of 10%, so that the pH of the solution is 7, and continue stirring for 2 h;

[0060] Step 4: filter with suction, wash the filter...

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Abstract

The invention discloses a carbon-silicon-tin compound negative electrode material. The carbon-silicon-tin compound negative electrode material comprises a carbon material particle matrix and a coating layer; the coating layer comprises a coating inner layer and a coating outer layer; the coating inner layer is a mixture of a silicon-tin composite material and amorphous carbon; the silicon-tin composite material is a silicon-based material of which the surface and holes are deposited with a nano tin material; the amorphous carbon coats the surface of the silicon-tin composite material and fills a gap between the carbon material particle matrix and the silicon-tin composite material; and the coating outer layer is a carbon coating layer. The invention further discloses a preparation method of the carbon-silicon-tin composite negative electrode material. The capacity of the carbon-silicon-tin composite negative electrode material prepared by the method is improved while the conductivity is improved, the volume expansion of the negative electrode material is effectively buffered, and the cycle performance is improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a carbon-silicon-tin composite negative electrode material and a preparation method thereof. Background technique [0002] Compared with other secondary batteries, lithium-ion batteries have the advantages of high voltage, high energy density, long cycle life, and environmental friendliness. At present, they have been widely used in portable electronic products and electric tools, and are expected to become the future hybrid electric vehicles and pure electric vehicles. One of the main energy sources for power vehicles. At present, graphite is the most commonly used anode material for lithium-ion batteries, which has the advantages of low price, abundant resources and good kinetic properties. However, the theoretical specific capacity of graphite is only 372mAh / g, which cannot meet the energy density requirements of various consumer electronic devices, especially energy stor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M10/0525C01B32/05C01B33/021C01B33/18C01G19/02
CPCC01B33/021C01B33/18C01G19/02C01P2004/03C01P2004/80C01P2006/40C01B32/05H01M4/366H01M4/386H01M4/483H01M4/625H01M4/626H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 杨书廷董红玉张芬丽郑延辉
Owner 河南电池研究院有限公司
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