A lithium ion battery silicon carbon composite material and its preparation method
A silicon-carbon composite material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high preparation cost, increased side reactions, increased electrical conductivity, etc., and achieves simple operation process and reduced volume change. , the effect of high electrochemical capacity
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Embodiment 1
[0040] First, the silicon dioxide raw material diatomite and magnesium powder are ball-milled on a ball mill at a molar ratio of 1:2, and then the ball-milled mixture is soaked in hydrochloric acid, then washed with deionized water, ethanol, etc., separated, and dried Then get nano-silicon.
[0041] Then add 0.2g of synthesized nano-silicon powder particles with a particle size of 50nm, 0.2g of graphite, and 0.1g of ferric nitrate into the aqueous solution of glucose with a concentration of 0.2M, and ultrasonically disperse for 30min to form a uniform suspension. or solution; then put the three solutions together and continue mixing evenly.
[0042] Secondly, the mixed solution obtained above is sprayed and cracked at 200° C. by spray drying method to obtain the primary product of Si-C-M composite material;
[0043] Then, 0.2g of the above Si-C composite material and 0.05g of asphalt were dispersed in tetrahydrofuran by ultrasonic for 90min to form a uniform suspension, and t...
Embodiment 2
[0046] First, the silicon dioxide raw material porous molecular sieve and the lithium block are ball-milled on a ball mill at a molar ratio of 1:2, and then the ball-milled mixture is soaked in sulfuric acid, then washed with deionized water, ethanol, etc., separated, and dried Get nano silicon.
[0047] Then add 0.2g of synthesized nano-silicon powder particles with a particle size of 100nm, 0.2g of graphite, and 0.1g of copper nitrate to the aqueous solution of citric acid with a concentration of 0.2M, and ultrasonically disperse for 30min to form a uniform suspension. liquid or solution; then put the three solutions together and continue mixing evenly.
[0048] Secondly, the mixed solution obtained above is sprayed and cracked at 500° C. by spray drying method to obtain the primary product of Si-C-M composite material;
[0049] Then, 0.2 g of the above-mentioned Si-C-M composite primary product and 0.05 g of polyacrylonitrile were dispersed in ethanol by ultrasonic for 90 ...
Embodiment 3
[0052] First, the silica raw material quartz stone and sodium block are ball-milled on a ball mill at a molar ratio of 1:2, and then the ball-milled mixture is soaked in hydrochloric acid, then washed with deionized water, ethanol, etc., separated, and dried Get nano silicon.
[0053] Then add 0.2g of synthesized nano-silicon powder particles with a particle size of 200nm, 0.2g of graphite, and 0.1g of manganese nitrate to the aqueous solution of 0.2M sucrose, and ultrasonically disperse for 30min to form a uniform suspension. or solution; then put the three solutions together and continue mixing evenly.
[0054] Secondly, the mixed solution obtained above is sprayed and cracked at 700° C. by spray drying method to obtain the primary product of Si-C-M composite material;
[0055] Then, 0.2g of the above-mentioned Si-C composite primary product and 0.05g of epoxy resin were dispersed in ethanol by ultrasonic for 90min to form a uniform suspension, and then vacuum-dried at 80°C...
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