A kind of lithium-ion battery silicon-carbon composite material and preparation method thereof
A technology of carbon composite materials and lithium-ion batteries, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of difficult uniform dispersion of nanomaterial agglomeration, difficult first-time efficiency, and difficult coating of chemical vapor deposition. , to achieve the effect of low price, excellent rate performance and cycle performance, conductivity and mechanical properties
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Embodiment 1
[0035] The cleaned rice husks were placed in an oven and baked at 100° C. for 12 hours. Weigh 1000g of dried rice husk, soak in 5000mL hydrochloric acid with a concentration of 12mol / L, soak for 1h, wash with deionized water until the pH is 6-7, put the pickled rice husk in an oven at 100°C Bake for 12 hours under the same conditions (see attached figure 1 ). The acidified and dried rice husk was pyrolyzed at 900° C. for 2 hours in an air atmosphere to obtain a white silica powder. Accurately weigh 100g of silicon dioxide and 100g of magnesium powder, mix them evenly, and then sinter in a box-type atmosphere furnace. The atmosphere is a mixed gas of 5% hydrogen and 95% argon. Keep warm for 5h. Soak the sintered material in 1000mL of hydrochloric acid with a concentration of 12mol / L. After soaking for 1h, wash it with deionized water until the pH is 6-7. After vacuum baking at 100°C for 12h, a nano-scale porous silicon yellow powder is obtained (XRD test see attached figu...
Embodiment 2
[0039] The cleaned rice husks were placed in an oven and baked at 100° C. for 12 hours. Weigh 1000g of dried rice husk, soak in 5000mL hydrochloric acid with a concentration of 6mol / L, soak for 3h, wash with deionized water until the pH is 6-7, put the pickled rice husk in an oven, 100℃ Bake for 12 hours under the same conditions. The acidified and dried rice husk was pyrolyzed at 700° C. for 3 hours in an air atmosphere to obtain a white silica powder. Accurately weigh 100g of silicon dioxide and 100g of magnesium powder, mix them evenly, and sinter in a box-type atmosphere furnace, the atmosphere is a mixture of 5% hydrogen and 95% argon, and heat to 700°C at a heating rate of 6°C / min. Keep warm for 12 hours. Soak the sintered material in 1000 mL of hydrochloric acid with a concentration of 6 mol / L for 3 hours, wash it with deionized water until the pH is 6-7, and bake it under vacuum at 100°C for 12 hours to obtain a nanoporous silicon yellow powder. Weigh 5.0g of porous...
Embodiment 3
[0042] The cleaned rice husks were placed in an oven and baked at 100° C. for 12 hours. Weigh 1000g of dried rice husk, soak in 5000mL of hydrochloric acid with a concentration of 1mol / L, soak for 5h, wash with deionized water until the pH is 6-7, put the pickled rice husk in an oven at 100°C Bake for 12 hours under the same conditions. The acidified and dried rice husk was pyrolyzed at 500° C. for 4 hours in an air atmosphere to obtain a white silica powder. Accurately weigh 100g of silicon dioxide and 100g of magnesium powder, mix them evenly, and sinter in a box-type atmosphere furnace. Keep warm for 24 hours. Soak the sintered material in 1000 mL of hydrochloric acid with a concentration of 1 mol / L for 4 hours, wash it with deionized water until the pH is 6-7, and bake it under vacuum at 100°C for 12 hours to obtain a nano-scale porous silicon yellow powder. Weigh 6.0g of porous silicon, 0.3g of carbon nanotubes, 2.7g of acetylene black, 0.5.0g of polyetherimide, 0.5.0g...
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