A nano silicon-carbon composite material and a preparation method and application thereof
A technology of carbon composite materials and nano-silicon, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of difficult formation of stable SEI film, impact on battery performance, additive consumption, etc., to achieve Effects of improving electrochemical performance, improving electrical conductivity, improving conductivity and buffering performance
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[0056] Example 1
[0057] The commercial crude silicon was ball milled at a speed of 480r / min for 10 hours, washed with 0.1 mol / L hydrochloric acid, and then heat-treated at 600°C for 3 hours under an argon atmosphere to initially crush and purify the crude silicon; The crude silicon and magnesium powder are mixed uniformly according to the molar ratio of silicon to magnesium of 1:2.04, and heat-treated in an argon atmosphere at 650°C for 5 hours to obtain a magnesium silicide alloy; the magnesium silicide alloy obtained above is placed in a magnetic boat, and polypropylene is placed In another magnetic boat, where the weight ratio of polypropylene and magnesium silicide is 0.5:1, the two magnetic boats are placed in a tube furnace, heated to 800°C in an argon atmosphere, and then heat treated in an argon atmosphere at 800°C After 20 hours, naturally cool to room temperature to obtain a silicon carbon nanocomposite material; mix the nano silicon carbon composite material obtained...
Example Embodiment
[0078] Example 2
[0079] The commercial crude silicon was ball milled at a speed of 480r / min for 10 hours, washed with 0.1 mol / L hydrochloric acid, and then heat-treated at 600°C for 3 hours under an argon atmosphere to initially crush and purify the crude silicon; The crude silicon and magnesium powder are mixed uniformly according to the molar ratio of silicon to magnesium of 1:2.06, and are heat-treated in an argon atmosphere at 550°C for 15 hours to obtain a magnesium-silicon alloy; the magnesium silicide alloy obtained above is placed in a magnetic boat, and polyethylene is placed In another magnetic boat, where the weight ratio of polyethylene and magnesium silicide is 1:1, the two magnetic boats are placed in a tube furnace, heated to 750°C in an argon atmosphere, and then heat treated in an argon atmosphere at 750°C After 30 hours, naturally cool to room temperature to obtain silicon carbon nanocomposite material; mix the nano silicon carbon composite material obtained a...
Example Embodiment
[0083] Example 3
[0084] The commercial crude silicon was ball milled at a speed of 480r / min for 10 hours, washed with 0.1 mol / L hydrochloric acid, and then heat-treated at 600°C for 3 hours under an argon atmosphere to initially crush and purify the crude silicon; The crude silicon and magnesium powder are mixed uniformly according to the molar ratio of silicon to magnesium of 1:2.02, and heat-treated in an argon atmosphere at 600°C for 10 hours to obtain a magnesium-silicon alloy; the magnesium silicide alloy obtained above is placed in a magnetic boat, and the polyethylene is placed In another magnetic boat, where the weight ratio of polyvinyl chloride and magnesium silicide is 2:1, the two magnetic boats are placed in a tube furnace, heated to 850°C in an argon atmosphere, and then in an argon atmosphere at 850°C Heat treatment for 15 hours and naturally cool to room temperature to obtain a silicon carbon nanocomposite material; mix the nano silicon carbon composite material...
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