Silsesquioxane-based nitrogen-doped silicon-carbon composite negative electrode material and preparation method thereof
A silsesquioxane-silicon-carbon composite technology, applied in negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of low specific capacity and cycle stability of lithium-ion batteries, uneven distribution of silicon and carbon, and achieve Improve the discharge specific capacity and cycle stability, improve the conductivity, and enhance the effect of surface polarization
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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, 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) Put the polymer gel powder in a nitrogen atmosphere and calcinate at 800 °C for 3 hours to obtain SiO x Nitrogen-doped composite mater...
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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