Preparation method of hollow nano-silicon sphere/graphene composite anode material
A graphene composite and nano-silicon sphere technology, which is applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of small-sized hollow nano-silicon sphere/graphene composite materials with less reporting and high consumption Energy, increase the cost of material preparation and other issues, achieve good structural stability and cycle performance, reduce energy waste, and simple methods
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Embodiment 1
[0032] A method for preparing a hollow nano silicon sphere / graphene composite material, specifically comprising the following steps:
[0033] 1. Take 0.05g of polyvinylpyrrolidone (K=28-32) and 0.5ml of 1% ammonia water, stir and dissolve in 15mL of deionized water;
[0034] 2. After the solution is clarified, add 0.1 g of cetyltrimethylammonium bromide to the above solution, stir, and heat at 45 degrees Celsius until clarification;
[0035] 3. Under vigorous stirring, add 0.5 mL of tetraethyl orthosilicate in 5 mL of ethanol solution to the above solution at one time, stir for another 3 h, and stir for 24 h in an oil bath at 130°C;
[0036] 4. Direct freeze-drying treatment to obtain silicon dioxide precursor powder;
[0037] 5. Heat-treat the silicon dioxide precursor powder in step 4 above in air at 550°C for 5 hours;
[0038]6. Take 0.1g of cetyltrimethylammonium bromide and add it to 30mL of water and stir to dissolve it, take 0.15g of silicon dioxide for ultrasonic dis...
Embodiment 2
[0043] A method for preparing a hollow nano silicon sphere / graphene composite material, specifically comprising the following steps
[0044] 1. Take 0.005g of polyvinylpyrrolidone (K=28-32) and 0.5ml of 5% ammonia water, stir and dissolve in 15ml of water;
[0045] 2. After the solution is clarified, add 0.1 g of cetyltrimethylammonium bromide to the above solution, stir, and heat at 30 degrees Celsius until clarified;
[0046] 3. Under vigorous stirring, add 45 ml of ethanol solution dissolved with 0.1 ml of tetraethyl orthosilicate into the above solution under vigorous stirring, stir for another 5 hours, and stir for 48 hours in an oil bath at 110°C;
[0047] 4. Freeze-drying treatment;
[0048] 5. Heat-treat the product of the above step 4 in air at 550°C for 5 hours;
[0049] 6. Take 0.05g of cetyltrimethylammonium bromide and add it to 30ml of water and stir to dissolve, take 0.15g of silicon dioxide for ultrasonic dispersion, add 30ml of ultrasonically dispersed graph...
Embodiment 3
[0053] A method for preparing a hollow nano silicon sphere / graphene composite material, specifically comprising the following steps
[0054] 1. Take 0.5g of polyvinylpyrrolidone (K=28-32) and 1ml of 25% ammonia water, stir and dissolve in 15ml of water;
[0055] 2. After the solution is clarified, add 0.5g of cetyltrimethylammonium bromide to the above solution, stir, and heat at 45 degrees Celsius until clarification;
[0056] 3. Under vigorous stirring, add 10 ml of ethanol solution dissolved with 1 ml of tetraethyl orthosilicate into the above solution under vigorous stirring, stir for another 10 h, and stir in an oil bath at 160 ° C for 24 h;
[0057] 4. Freeze-drying treatment;
[0058] 5. Heat-treat the product of the above step 4 in air at 550°C for 5 hours;
[0059] 6. Take 0.1g of cetyltrimethylammonium bromide and add it to 30ml of water and stir to dissolve, take 0.15g of silicon dioxide for ultrasonic dispersion, add 15ml of ultrasonically dispersed graphene oxid...
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