Preparation method of flaky-graphene@silicon@amorphous carbon-sandwich structure composite material as well as product and application thereof
A technology of amorphous carbon and composite materials, applied in nanotechnology, structural parts, active material electrodes for materials and surface science, etc., can solve problems such as shedding of negative electrode silicon materials
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Embodiment 1
[0028] A sheet-graphene@silicon@amorphous carbon-sandwich structure composite material, synthesized by sol-gel method, hydrothermal method and magnesia thermal reduction method-sheet-graphene@silicon@amorphous carbon-sandwich structure composite Material, remove magnesium oxide and magnesium silicide impurity to obtain pure product through follow-up acid treatment, prepare according to the following steps:
[0029] a. Take 0.1g of graphene oxide, add it to 80 ml of deionized water, stir for 20 minutes, and ultrasonically disperse for 3 hours to obtain a solution;
[0030] b. Add 5 ml of ethyl orthosilicate dropwise to solution a, and stir for 2 h to obtain solution b;
[0031] c. Add 10 g of glucose into solution b, and stir for 10 minutes to obtain solution c;
[0032] d. Pour solution c into a 100 ml hydrothermal reaction kettle, place it in an oven at 180°C, and keep it warm for 15 hours;
[0033] e. Open the hydrothermal reaction kettle, filter and wash the obtained samp...
Embodiment 2
[0037] A sheet-graphene@silicon@amorphous carbon-sandwich structure composite material, similar to Example 1, prepared according to the following steps:
[0038] a. Take 0.2 g of graphene oxide, add it to 80 ml of deionized water, stir for 20 minutes, and ultrasonically disperse for 3 hours to obtain a solution;
[0039] b. Add 5 ml of ethyl orthosilicate dropwise to solution a, and stir for 2 h to obtain solution b;
[0040] c. Add 10 g of glucose into solution b, and stir for 10 minutes to obtain solution c;
[0041] d. Pour solution c into a 100 ml hydrothermal reaction kettle, place it in an oven at 180°C, and keep it warm for 15 hours;
[0042] e. Open the hydrothermal reaction kettle, filter and wash the obtained sample with deionized water for several times, and then place it in an oven at 80°C for 12 hours to obtain a sheet-like graphene@silicon dioxide@partial organic carbon-sandwich structure composite material;
[0043]f. Mix the above flake-graphene@silicon dioxi...
Embodiment 3
[0046] A sheet-graphene@silicon@amorphous carbon-sandwich structure composite material, similar to Example 1, prepared according to the following steps:
[0047] a. Take 0.1 g of graphene oxide, add it to 80 ml of deionized water, stir for 20 minutes, and ultrasonically disperse for 2 hours to obtain a solution;
[0048] b. Add 5 ml of ethyl orthosilicate dropwise to solution a, and stir for 2 h to obtain solution b;
[0049] c. Add 10 g of glucose into solution b, and stir for 10 minutes to obtain solution c;
[0050] d. Pour solution c into a 100 ml hydrothermal reaction kettle, place it in an oven at 200°C, and keep it warm for 15 hours;
[0051] e. Open the hydrothermal reaction kettle, filter and wash the obtained sample with deionized water for several times, and then place it in an oven at 80°C for 12 hours to obtain a sheet-like graphene@silicon dioxide@partial organic carbon-sandwich structure composite material;
[0052] f. Mix the above flake-graphene@silicon diox...
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