A kind of silicon carbon negative electrode material and its preparation method and application
A negative electrode material, silicon carbon technology, applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems of insufficient charge and discharge performance, cycle performance and capacity performance, and achieve high discharge capacity, good safety and high cycle life Effect
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Embodiment 1
[0036] A high-capacity silicon-carbon negative electrode material, the preparation method is as follows:
[0037] (1) Dissolve 30 parts of acrylic acid in 70 parts of 75% ethanol aqueous solution, pass nitrogen gas, and add 0.1 parts of N, N-methylenebisacrylamide as a crosslinking agent in a deoxygenated state according to the weight ratio, and add 1 part of ammonium bisulfite and 2 parts of ammonium persulfate are used to initiate the polymerization reaction, and react in a water bath at 20-60°C for 4-24 hours to form a hydrogel;
[0038](2) Add 100 parts of saturated lithium carbonate solution to the hydrogel to make the hydrogel swell; within 1 hour, gradually add 1 part of 50 nm ultrafine silicon powder, stir and let it stand to disperse evenly, and obtain a silicon-containing The hydrogel; the hydrogel is dried, the drying temperature is 40-100 ° C, and the drying time is 6-24 hours; it is sintered in a tube furnace under the protection of argon, and the heating rate of ...
Embodiment 2
[0040] A high-capacity silicon-carbon negative electrode material, the preparation method is as follows:
[0041] (1) Add 30 parts of methacrylic acid to 70 parts of 25% ethanol aqueous solution, pass through nitrogen, and add 0.5 parts of N,N-methylenebisacrylamide as a crosslinking agent in a deoxygenated state according to the weight ratio , adding 1 part of ammonium bisulfite and 1 part of ammonium persulfate respectively to initiate the polymerization reaction, and react in a water bath at 20-60°C for 4-24 hours to form a hydrogel;
[0042] (2) Add 100 parts of saturated lithium carbonate solution to the hydrogel to make the hydrogel swell; within 1 hour, gradually add 50 parts of 800nm silicon dioxide, stir and let it stand to disperse evenly, and obtain water containing silicon Gel; dry the hydrogel at a drying temperature of 40-100°C and a drying time of 6-24 hours; put it into a tube furnace and sinter it under the protection of argon, and the heating rate during th...
Embodiment 3
[0044] A high-capacity silicon-carbon negative electrode material, the preparation method is as follows:
[0045] (1) Dissolve 30 parts of acrylic acid in 70 parts of 75% ethanol aqueous solution, pass through nitrogen, and add 0.2 parts of N, N-methylenebisacrylamide as a crosslinking agent in a deoxygenated state according to the weight ratio, and add 1 part of ammonium bisulfite and 1 part of ammonium persulfate are used to initiate the polymerization reaction, and react in a water bath at 20-60°C for 4-24 hours to form a hydrogel;
[0046] (2) Add 100 parts of saturated lithium carbonate solution to the hydrogel to make the hydrogel swell; within 1 hour, gradually add 10 parts of 800nm silicon dioxide, stir and let it stand to disperse evenly, and obtain water containing silicon. Gel; dry the hydrogel at a drying temperature of 40-100°C and a drying time of 6-24 hours; put it into a tube furnace and sinter it under the protection of argon, and the heating rate during the...
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