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A kind of preparation method and application of nano-silicon carbide material with high metal content
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A nano-silicon carbide and high-metal technology, applied in the direction of silicon carbide, chemical instruments and methods, nanotechnology for materials and surface science, etc., can solve the complex metal doping process, unsatisfactory effect, and difficulty in doping silicon carbide And other problems, to achieve the effect of high energy density, stable cycle performance and long life
Active Publication Date: 2019-10-11
HUBEI UNIV OF TECH
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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 processing technology for doping, especially the full doping of nanoscale metals.
Especially the metal doping process is very complicated and the effect is not ideal
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[0042] The specific preparation method of the nano-silicon carbide material with high metal content comprises the following steps:
[0043] (1) Preparation of mixed metal powder: In an inert atmosphere, weigh the metal lithium whose surface has been nitrided by weight ratio of 90-99%: 0.5-3%: 0.1-3%: 0.2-2%: 0.2-2% Powder, metal aluminum powder, metal beryllium powder, metal magnesium powder, metal titanium powder, a total of 500g; the average diameter of the powder particles is 0.5 ~ 5um. The inert gas can be N 2 , Kr, He and other commonly used inert gases;
[0044] (2) Weigh amorphous silicon carbide powder, polysiloxane, lithiated polyacetylene, metal mixed powder by weight ratio 0.1~2%: 45~54.5%: 30~45%: 0.4~23%, totally 1200g; The average diameter of the powder particles is 0.5-5um;
[0045] (3) Put the material obtained in step (2) into a stainless steel stirrer, add 300ml of absolute ethanol, mechanically stir for 48h, mix evenly, and fill the mold cover;
[0046] ...
Embodiment 1
[0054] The raw materials used and their weight ratios are: 0.1% of amorphous silicon carbide powder, 54.5% of polysiloxane, 45% of lithiated polyacetylene and 0.4% of metal mixed powder, wherein metal lithium powder, metal aluminum powder, The weight ratio of metal beryllium powder, metal magnesium powder and metal titanium powder is 90:3:2.5:2.5:2, and the preparation method of the nano-silicon carbide material with high metal content is the same as above.
Embodiment 2
[0056] 0.5% of amorphous silicon carbide powder, 51% of polysiloxane, 40% of lithium polyacetylene and 8.5% of metal mixed powder, wherein, metal lithium powder, metal aluminum powder, metal beryllium powder, metal magnesium powder and The weight ratio of the metal titanium powder is 94:2.5:2:0.8:0.7, and 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 nano silicon carbide material with high metal content, an electrode prepared by the nano silicon carbide material with high metal content, and a whole silicon carbide lithium secondary battery. Raw materials used in the preparation method include an amorphous silicon carbide powder, polysiloxane, lithium polyacetylene and a metal mixed powder; the metal mixed powder is formed by mixing a metal lithium powder, a metal aluminum powder, a metal beryllium powder, a metal magnesium powder and a metal titanium powder, at the same time, a dielectric barrier discharge plasma process and a high-energy ultrafast laser technology are adopted, and the content of metals in the obtained nano silicon carbide material is high. The whole silicon carbide lithium secondary battery assembled by the electrode prepared by the nano silicon carbide material with high metal content has the advantages of long life, high capacity and good cycling performance, the first Kulun efficiency reaches 99.9%, the discharge platform is 4.1-3.5 V, the specific capacity reaches 2450 mAh / g, the discharge energy density reaches 1600-2000 Wh / kg, the power density reaches 1600-2000 W / kg, and the cycle period can reach 20000 times.
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, ...
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