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Porous silicon-carbon composite material and preparation method thereof

A technology of carbon composite materials and porous silicon, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve problems such as low Coulombic efficiency, poor cycle performance, and poor rate performance

Active Publication Date: 2020-01-03
BEIJING IAMETAL NEW ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of poor cycle performance, poor rate performance and low coulombic efficiency of existing silicon-based composite materials, and provides a porous composit

Method used

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  • Porous silicon-carbon composite material and preparation method thereof
  • Porous silicon-carbon composite material and preparation method thereof
  • Porous silicon-carbon composite material and preparation method thereof

Examples

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preparation example 1

[0065] (1) Combine 3Kg Si powder with 6Kg SiO 2 The powder is added to the high-speed mixer, stirred and mixed at 1000 r / min for 30 minutes under the protection of an inert atmosphere and cooled with circulating water to obtain a uniformly mixed raw material A, and then the raw material A is kept at 50°C under argon protection for 2 hours to fully remove water; At the same time, 0.5Kg of magnesium metal powder and 0.5kg of magnesium-aluminum alloy (with a magnesium content of 36.2wt%) are kept at 50°C for 2h under the protection of argon to fully remove water, which is the raw material B.

[0066] (2) Put the above-mentioned dried raw material A into the heating chamber 1 of a vacuum furnace with a condensation collection system, draw the vacuum below 1 Pa to start heating, and heat it to 1300°C for 20 hours; at the same time add the dried raw material B In the heating chamber 2, the vacuum is then evacuated to below 1 Pa to start heating, and the temperature is heated to 1000°C f...

preparation example 2

[0069] The operation was carried out in the same manner as in Preparation Example 1, except that the raw material B in step (1) was 0.3 kg of magnesium metal powder and 0.7 kg of magnesium aluminum alloy. The resulting bulk deposition material is silicon-based material, called silicon-based material 2

preparation example 3

[0071] The operation is performed in the same manner as in Preparation Example 1, except that the raw material B in step (1) is 0.7Kg of magnesium metal powder and 0.3kg of magnesium aluminum alloy. The obtained bulk deposition material is the silicon-based material, which is called the silicon-based material 3.

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Abstract

The invention discloses a porous silicon-carbon composite material and a preparation method thereof. The porous silicon-carbon composite material is formed by bonding a silicon-based material and a carbon-based material. The silicon-based material comprises silicon, a silicon oxide and silicate, and the silicate is dispersed in a silicon oxide substrate. The carbon-based material comprises a carbon material and an amorphous carbon coating material. The carbon material and the silicon-based material are in contact with each other and are bonded together to form a porous structure, and the amorphous carbon coating material coats the surface of the porous structure. The condition is that the total mass of the porous silicon-carbon composite material is 100%, and the mass percentage content ofsilicate is 5%-30%. The porous silicon-carbon composite material shows an extremely low expansion rate when used as a lithium ion battery negative electrode material, and has high specific capacity,high initial coulombic efficiency, excellent cycle performance and excellent rate capability. In addition, the preparation method is simple, and is a method suitable for industrial large-scale production of the silicon-carbon composite material for lithium ion batteries.

Description

Technical field [0001] The invention belongs to the technical field of batteries, and specifically relates to a porous silicon-carbon composite material and a preparation method thereof, and a battery negative electrode and a lithium ion battery containing the porous silicon-carbon composite material. Background technique: [0002] People's high dependence on non-renewable energy has caused more and more environmental problems, and the research and development of clean energy has become one of the most concerned topics in the world. On the one hand, clean energy from solar and wind energy is gradually occupying a larger market scale. In order to realize its wider application, it is necessary to develop more efficient energy conversion and storage equipment; on the other hand, the research on electric vehicles is to get rid of Our dependence on oil and other traditional energy sources also requires higher energy density energy storage equipment. With its own high energy density, ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/483H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 郭玉国李阁黄林波殷雅侠岳风树姚钧赵岸光
Owner BEIJING IAMETAL NEW ENERGY TECH CO LTD
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