Preparation method of silicon and graphene composite material
A composite material, graphene technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of low efficiency, cumbersome process, affecting the performance of electrode materials, etc.
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[0021] The preparation method of the silicon and graphene composite material of the present embodiment, the preparation process is as follows:
[0022] Graphite → graphite oxide → reduction in a silicon-containing reducing gas atmosphere → silicon, graphene composite material
[0023] Specifically include the following steps:
[0024] Step S1: preparing graphite oxide.
[0025] Preferably, the following method can be used to prepare, including the following steps: adding graphite raw materials, potassium persulfate and phosphorus pentoxide to concentrated sulfuric acid at 80°C, stirring evenly, cooling for more than 6 hours, suction filtration, and washing to neutral , dried to obtain a mixed sample; then the mixed sample was added to concentrated sulfuric acid at 0°C, and then potassium permanganate was added, the temperature of the system was kept below 20°C, and then kept in an oil bath at 35°C for 2 hours, slowly Add deionized water, and after 15 minutes, add deionized w...
Embodiment 1
[0034] The preparation process is as follows:
[0035] Graphite raw material → graphite oxide → reduction in silicon-containing reducing gas atmosphere → silicon, graphene composite material
[0036] (1) Graphite raw material: 50 meshes of natural flake graphite with a purity of 99.5%.
[0037](2) Graphite oxide: Add 20g of graphite raw material, 10g of potassium persulfate and 10g of phosphorus pentoxide into concentrated sulfuric acid at 80°C, stir evenly, cool for more than 6 hours, filter with suction, wash until neutral, and dry to obtain a mixed sample ;
[0038] Add the dried mixed sample to 230mL of concentrated sulfuric acid at 0°C, then add 60g of potassium permanganate, keep the temperature of the system below 20°C, then keep it in an oil bath at 35°C for 2 hours, then slowly add 920mL Deionized water;
[0039] After 15 minutes, add 2.8L of deionized water to the system until the color of the mixture turns bright yellow, filter while hot, then wash with 5L of 10%...
Embodiment 2
[0044] The preparation of graphite oxide is the same as in Example 1.
[0045] Put the prepared graphite oxide powder into the SiH 4 with H 2 In a tube furnace with mixed gas, the temperature was raised slowly to 400°C at a rate of 100°C / min for 1 hour, and then the reacted powder was placed in H 2 The atmosphere was cooled to room temperature with the furnace to obtain a silicon and graphene composite material, wherein the mass fraction of silicon was 20%.
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