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Silicon-based negative electrode material, and preparation method and application thereof

A silicon-based negative electrode material, silicon carbon technology, applied in the direction of negative electrodes, nanotechnology for materials and surface science, chemical instruments and methods, etc., can solve the problems of electrode loss of connectivity, active material fragmentation, cycle capacity attenuation, etc. , to achieve the effect of short synthesis time, simple method and low cost

Active Publication Date: 2021-10-08
SONGSHAN LAKE MATERIALS LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, silicon has a large volume expansion of about 400% during the lithium storage process, which will cause the active material to be broken, so that it will fall off from the current collector, resulting in the loss of electrical connectivity of the electrode, so that its cycle capacity will rapidly decay.

Method used

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  • Silicon-based negative electrode material, and preparation method and application thereof
  • Silicon-based negative electrode material, and preparation method and application thereof
  • Silicon-based negative electrode material, and preparation method and application thereof

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preparation example Construction

[0058] According to one aspect of the invention, the present invention relates to a method of preparing a silicon-based negative electrode material comprising the steps of:

[0059] Silicon-carbon complex nannosphere powder, graphite and carbonized mixtures of carbonized materials are heated;

[0060] The preparation method of the silicon-carbon complex nannosphere powder includes: the gas-containing gas containing silicon-containing liquid precursor is pyrolysis to obtain a silicon oxide-carbon complex nannosphere powder, and then aluminum heat reduction.

[0061] The present invention is a method for preparing silicon-carbon-carbon complex nanosphere powder using normal pressure chemical gas phase heat to prepare silicon-carbon carbon at home and abroad, and the silicon oxide-carbon complex nanosphere powder is in high pressure reactor. The aluminum heat reduction is carried out to obtain silicon-carbon complex nannosphere powder, and the silicon-carbon-carbon-carbon complex nan...

Embodiment 1

[0092] Silicon oxide-carbon complex nanosphere powder preparation method, including the following steps:

[0093] 3 ml of octamethylene trikoxane was heated to 300 ° C to evaporate, and the vapor flows into a tubular furnace having a temperature of 1020 ° C under the driving of the argon flow, and the thermosilicon-carbon compound is obtained after 4 hours. Nano spherical powder.

Embodiment 2

[0095] Silicon oxide-carbon complex nanosphere powder preparation method, including the following steps:

[0096] 4 ml of hexahydiloxane was heated to 50 ° C to evaporate, and its vapor flows into a tubular furnace at a temperature of 1100 ° C, and has an injection of 2 hours. After natural cooling, a silicon oxide-carbon compound is obtained. Nano spherical powder.

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Abstract

The invention relates to the technical field of batteries, and concretely relates to a silicon-based negative electrode material, and a preparation method and application thereof. The preparation method of the silicon-based negative electrode material comprises the following steps: carrying out heating treatment on a mixture of silicon-carbon composite nano spherical powder, graphite and an easily carbonized material. A preparation technology of the silicon-carbon composite nano spherical powder comprises the following steps: pyrolyzing a gasified material of a silicon-carbon-containing liquid precursor to obtain silicon monoxide-carbon composite nano spherical powder, and then performing aluminothermic reduction. The preparation process is simple, the precursor is low in price, the method is suitable for large-scale popularization and has a good application prospect, and the prepared silicon-carbon-graphite composite material has high capacity, long cycle life and excellent rate capability when being used as a lithium ion battery negative electrode material.

Description

Technical field [0001] The present invention relates to the field of battery technology, and in particular, there is a silicon-based negative electrode material and a preparation method thereof. Background technique [0002] In order to solve the increasing depletion of non-renewable resources such as coal and petroleum and its combustion product carbon dioxide produce a greenhouse effect, various countries began to develop new energy, such as solar energy, wind energy, geothermal energy and hydrogen energy. However, these new energy have characteristics such as intermittent, randomness and low energy density, which requires the development of energy storage devices to store these new energy sources for use. In many developed energy storage devices, rechargeable lithium-ion batteries have been widely used due to high safety and high energy density. In recent years, with the development and application of electric vehicles, the lithium-ion battery in which higher energy density an...

Claims

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Application Information

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IPC IPC(8): C01B33/023C01B32/15C01B32/205C01B32/21H01M4/38H01M4/587H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCC01B33/023C01B32/15C01B32/205C01B32/21H01M4/386H01M4/587H01M4/625H01M4/628H01M10/0525B82Y30/00B82Y40/00H01M2004/021H01M2004/027Y02E60/10
Inventor 韩美胜于杰李振伟
Owner SONGSHAN LAKE MATERIALS LAB
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