Preparation method and application of nanometer silicon carbide material with high metal content

A nano-silicon carbide, high-metal technology, applied in the fields of silicon carbide, chemical instruments and methods, nanotechnology for materials and surface science, etc., can solve the difficulty of doping silicon carbide, the complex metal doping process, and the unsatisfactory effect. and other problems, to achieve the effects of stable cycle performance, high energy density and long life.

Active Publication Date: 2018-01-05
HUBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, silicon carbide doping is very difficult, and impurities are not easy to enter the crystal lattice. Therefore, it is a problem to be solved to use special

Method used

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  • Preparation method and application of nanometer silicon carbide material with high metal content
  • Preparation method and application of nanometer silicon carbide material with high metal content
  • Preparation method and application of nanometer silicon carbide material with high metal content

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preparation example Construction

[0039] The specific preparation method of the nano-silicon carbide material with high metal content comprises the following steps:

[0040] (1) Preparation of mixed powder: in an inert atmosphere, weigh the lithium metal powder, neodymium metal powder and lanthanum metal powder whose surface has been nitrided by weight ratio of 60-80%: 10-20%: 10-20% , the average diameter of the powder particles is 0.4-5um. The lithium rare earth alloy powder, the silicon powder and the graphene powder are weighed in a weight ratio of 10-20%: 30-40%: 40-50%, 280g in total. The inert gas can be N 2 , Kr, He and other commonly used inert gases;

[0041] (2) Take amorphous silicon carbide powder, polysiloxane, lithiated polyacetylene, and mixed powder by weight ratio of 0.1-2%: 45-54.5%: 30-45%: 0.4-23%; the powder particles The average diameter is 0.5 ~ 5um;

[0042] (3) Put the material obtained in step (2) into a mechanical stirrer and add 200ml of acetone, seal and stir for 24 hours, mix...

Embodiment 1

[0051] The raw materials used and their weight ratios are: 0.1% of amorphous silicon carbide powder, 54.5% of polysiloxane, 45% of lithium polyacetylene and 0.4% of mixed powder, wherein, in the mixed powder, lithium rare earth alloy powder, silicon powder and The weight ratio of graphene powder is 10%: 40%: 50%, and the weight ratio of metal lithium powder, metal neodymium powder and metal lanthanum powder in the described lithium rare earth alloy powder is: 60%: 20%: 20%, so The preparation method of the nano-silicon carbide material with high metal content is the same as above.

Embodiment 2

[0053] The raw materials used and their weight ratios are: 0.5% of amorphous silicon carbide powder, 51% of polysiloxane, 40% of lithiated polyacetylene and 8.5% of mixed powder, wherein, in the mixed powder, lithium rare earth alloy powder, silicon powder and The weight ratio of graphene powder is 20%: 30%: 50%, and the weight ratio of metal lithium powder, metal neodymium powder and metal lanthanum powder in the described lithium rare earth alloy powder is: 80%: 10%: 10%, so The preparation method of the nano-silicon carbide material with high metal content is the same as above.

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Abstract

The invention provides a preparation method of a nanometer silicon carbide material with high metal content, an electrode prepared by employing the same and an all-silicon carbide lithium secondary battery. The raw materials used by the preparation method comprises amorphous silicon carbide powder, polysiloxane, lithium polyacetylene and mixed powder, wherein the mixed powder is formed by mixing lithium rare-earth alloy powder, silicon powder and graphene powder, the lithium rare-earth alloy powder comprises metal lithium powder, metal neodymium powder and metal lanthanum powder, a dielectricbarrier discharging plasma process and a high-energy ultrafast laser technology are simultaneously employed, and the obtained nanometer silicon carbide material is high in metal content; and the all-silicon carbide lithium secondary battery formed by assembling the electrode prepared from the nanometer silicon carbide material with high metal content is long in lifetime, high in capacity and goodin cycle performance, the initial coulombic efficiency of the battery reaches 99.98%, the discharging platform is 3.0-2.0V, the specific capacity reaches 2,400mAh/g, the discharging energy density reaches (1,700-2,200)Wh/kg, the power density reaches (1,400-2,600)W/kg, and the cycle period reaches 20,000 times or above.

Description

technical field [0001] The invention relates to a nanometer material, in particular to a preparation method and application of a nanometer silicon carbide material with high metal content, and belongs to the technical field of new energy sources. Background technique [0002] The smog caused by fuel vehicle exhaust seriously damages people's health. The root of reducing smog is to use new energy, such as driving electric vehicles in cities, and power plants using renewable non-coal technologies such as solar power, wind power, and hydropower to obtain clean energy. This shows that one of the necessary conditions for the existence of new energy technologies is energy storage and transportation. Now energy storage technology is limited by battery life and capacity, and power batteries for electric vehicles also need to consider safety issues. The existing secondary batteries of these several technical indicators cannot satisfy. Electrode materials such as organic polymers, ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M10/0525B82Y30/00B82Y40/00C01B32/984C01B32/977C01B32/956
CPCY02E60/10
Inventor 张洪涛
Owner HUBEI UNIV OF TECH
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