Preparation method and application of porous silicon/carbon composite material
A carbon composite material and porous silicon technology, applied in the field of preparing porous silicon/carbon composite materials, can solve the problems of high energy consumption, difficult industrial application, high cost, etc., and achieve the effects of controllable reaction, low cost and high yield
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Embodiment 1
[0031] A kind of preparation method of porous silicon / carbon composite material comprises the following steps:
[0032] S1. Under the condition of atmosphere protection, grind 1g of silicon dioxide powder and 1.2g of magnesium hydride evenly, put the evenly ground mixture into a closed heating tube and vacuumize the heating tube at a heating rate of 2°C / min Raise to 500°C for heating, holding time is 5h;
[0033] S2. After the reaction is over, grind 2g of the intermediate product obtained in step S1 and 1g of lithium carbonate evenly, place it in a closed heating tube and vacuumize it, and then heat it up to 650°C at a heating rate of 2°C / min. for 5h;
[0034] S3. After the reaction, the product was soaked in 1M dilute hydrochloric acid for 3 hours, 10% hydrofluoric acid for half an hour, washed with deionized water three times, washed with alcohol three times, filtered by suction, and then vacuum-dried at 80°C to obtain a porous Silicon / carbon composites.
[0035] figure...
Embodiment 2
[0041] A kind of preparation method of porous silicon / carbon composite material comprises the following steps:
[0042] S1. Under the condition of atmosphere protection, grind 1g of silicon dioxide powder and 1.2g of magnesium hydride evenly, put the evenly ground mixture into a closed heating tube and vacuumize the heating tube at a heating rate of 0.5°C / min Raise to 300°C for heating, and the holding time is 1h;
[0043] S2. After the reaction is over, grind 2 g of the intermediate product obtained in step S1 with 0.2 g of sodium carbonate evenly, place it in a closed heating tube and vacuumize it, then heat it up to 400 ° C at a heating rate of 0.5 ° C / min, and keep it warm The time is 1h;
[0044] S3. After the reaction is completed, the product is soaked in 1M dilute hydrochloric acid for 2 hours, soaked in 10% hydrofluoric acid for half an hour, washed twice with deionized water, washed twice with alcohol, filtered by suction, and then vacuum-dried at 70°C to obtain ...
Embodiment 3
[0049] A kind of preparation method of porous silicon / carbon composite material comprises the following steps:
[0050] S1. Under the condition of atmosphere protection, grind 1g of silicon dioxide powder and 5g of magnesium hydride evenly, put the evenly ground mixture into a closed heating tube and vacuumize the heating tube at a heating rate of 10°C / min. Heating to 800°C, the holding time is 10h;
[0051] S2, after the reaction is over, grind 1g of the intermediate product obtained in step S1 and 10g of potassium carbonate evenly, place it in a closed heating tube and vacuumize it, then heat it up to 1200°C at a heating rate of 10°C / min. for 10h;
[0052] S3. After the reaction, the product was soaked in 1M dilute hydrochloric acid for 4 hours, 10% hydrofluoric acid for half an hour, washed with deionized water for 4 times, washed with alcohol for 4 times, suction filtered, and then vacuum-dried at 90°C to obtain Porous silicon / carbon composites.
[0053] S4. Use the por...
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