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Silsesquioxane-based nitrogen-doped silicon-carbon composite anode material and preparation method thereof

A silsesquioxane-silicon-carbon composite technology, which is applied in negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of uneven distribution of silicon and carbon, low specific capacity and cycle stability of lithium-ion batteries, etc. Achieve the effects of improving conductivity, improving discharge specific capacity and cycle stability, and good dispersion

Active Publication Date: 2019-11-08
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention aims to propose a method for preparing a nitrogen-doped silicon-carbon composite negative electrode material based on silsesquioxane, so as to solve the problem of uneven distribution of silicon and carbon in the existing silicon-carbon composite negative electrode material, which causes lithium ion The problem of low specific capacity and cycle stability of the battery

Method used

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  • Silsesquioxane-based nitrogen-doped silicon-carbon composite anode material and preparation method thereof
  • Silsesquioxane-based nitrogen-doped silicon-carbon composite anode material and preparation method thereof
  • Silsesquioxane-based nitrogen-doped silicon-carbon composite anode material and preparation method thereof

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Embodiment 1

[0038] A method for preparing a nitrogen-doped silicon-carbon composite negative electrode material based on silsesquioxane, specifically comprising the following steps:

[0039] 1) Add 0.5 g of octavinylsilsesquioxane to 5 mL of 1-vinylimidazole, and mix evenly under the action of magnetic stirring to obtain a mixed solution A;

[0040] 2) Add 104uL of 2-hydroxy-2-methylpropiophenone into the mixed solution A, and stir evenly to obtain the mixed solution B;

[0041] 3) Put the mixed solution B into an ultraviolet analyzer, and under the action of ultraviolet rays with a wavelength of 365nm, perform an in-situ polymerization reaction for 15 minutes to obtain a polymer gel;

[0042] 4) The polymer gel was filtered and washed with absolute ethanol, then vacuum-dried at 85° C. for 12 hours, and then ground to obtain a polymer gel powder;

[0043] 5) Place the polymer gel powder in a nitrogen atmosphere and calcinate at 800°C for 3 hours to obtain SiO x Nitrogen-doped composite ...

Embodiment 2

[0063] A method for preparing a nitrogen-doped silicon-carbon composite negative electrode material based on silsesquioxane, specifically comprising the following steps:

[0064] 1) Add 0.3g of octavinylsilsesquioxane to 5mL of N-vinylpyrrolidone, and mix evenly under the action of magnetic stirring to obtain a mixed solution A;

[0065] 2) Add 156uL of 2-hydroxy-2-methylpropiophenone into the mixed solution A, and stir evenly to obtain the mixed solution B;

[0066] 3) Put the mixed solution B into an ultraviolet analyzer, under the action of ultraviolet rays with a wavelength of 365nm, perform an in-situ polymerization reaction for 10 minutes to obtain a polymer gel;

[0067] 4) The polymer gel was filtered and washed with absolute ethanol, then vacuum-dried at 85° C. for 12 hours, and then ground to obtain a polymer gel powder;

[0068] 5) Place the polymer gel powder in a nitrogen atmosphere and calcinate at 850 °C for 3 hours to obtain SiO x Nitrogen-doped composite mat...

Embodiment 3

[0078] A method for preparing a nitrogen-doped silicon-carbon composite negative electrode material based on silsesquioxane, specifically comprising the following steps:

[0079] 1) Add 0.7g of octavinylsilsesquioxane to 5mL of N-vinylformamide, and mix evenly under the action of magnetic stirring to obtain a mixed solution A;

[0080] 2) Add 254uL of 2-hydroxy-2-methylpropiophenone into the mixed solution A, and stir evenly to obtain the mixed solution B;

[0081] 3) Put the mixed solution B into an ultraviolet analyzer, and under the action of ultraviolet rays with a wavelength of 365nm, perform an in-situ polymerization reaction for 20 minutes to obtain a polymer gel;

[0082] 4) The polymer gel was filtered and washed with absolute ethanol, then vacuum-dried at 85° C. for 12 hours, and then ground to obtain a polymer gel powder;

[0083] 5) Place the polymer gel powder in a nitrogen atmosphere and calcinate at 900°C for 3 hours to obtain SiO x Nitrogen-doped composite ma...

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Abstract

The invention provides a silsesquioxane-based nitrogen-doped silicon-carbon composite anode material and a preparation method thereof. The preparation method adopts octavinylsilsesquioxane and a nitrogen-containing olefin derivative as reaction monomers, and adopts in-situ polymerization and high-temperature calcination treatment, and then performs magnesium reduction treatment, so that the silicon carbon in the silsesquioxane-based nitrogen-doped silicon-carbon composite anode material prepared by the invention can be uniformly distributed, thereby allowing the lithium ion battery based on the silsesquioxane-based nitrogen-doped silicon-carbon composite anode material prepared in the invention to have the high specific capacity and cycle stability.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a silsesquioxane-based nitrogen-doped silicon-carbon composite negative electrode material and a preparation method thereof. Background technique [0002] With the continuous development of society, people's demand for energy continues to increase. However, traditional energy reserves are limited, and these traditional energy sources cause certain pollution to the environment during use. For example, the use of traditional energy such as coal, oil, and natural gas produces carbon dioxide gas and some toxic and harmful gases, which continuously deteriorates the environment around us and seriously threatens the normal life of human beings. Therefore, people urgently need to develop a new energy source to solve the energy crisis and realize environmental protection at the same time. As a secondary energy source, lithium-ion batteries have the characteristics of no po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 涂文懋张恒张海宁朱君可
Owner WUHAN UNIV OF TECH
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