A carbon @fe 2 o 3 @Carbon microsphere composite material and its application
A composite material and carbon microsphere technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of poor cycle life of negative electrode materials, and achieve the effect of improving cycle life, good reproducibility and simple process
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Embodiment 1
[0031] (1) Add 1.7ml TEOS and 4ml ammonia water to the mixed solution consisting of 15ml ethanol and 6ml water and stir for 1 hour. Subsequently, 0.4 g of resorcinol and 0.56 ml of formaldehyde were added, and stirring was continued for 24 h. Subsequently, the reaction solution was hydrothermally reacted at 100° C. for 24 h, and the product was collected by centrifugation and washed 4 times with ethanol. Get SiO 2 @Phenolic Resin.
[0032] (2) SiO after step (1) drying 2 @Phenolic resin is placed in a tube furnace, fed with nitrogen protection gas at an intake rate of 0.5L / min, firstly heated to 400°C at a rate of 6°C / min and kept for half an hour, then at a rate of 1°C / min Raise the temperature to 700°C and keep it for 2 hours to obtain SiO 2 @Carbon microspheres, then SiO 2 The @carbon was soaked in 15wt% hydrofluoric acid solution for 12 hours, then centrifuged to collect the product, and washed with water until neutral to obtain hollow carbon spheres.
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Embodiment 2
[0040] (1) Add 2.2ml TEOS and 4ml ammonia water to the mixed solution consisting of 19ml ethanol and 8ml water and stir for 1 hour. Subsequently, 0.4 g of resorcinol and 0.56 ml of formaldehyde were added, and stirring was continued for 24 h. Subsequently, the reaction solution was hydrothermally reacted at 100° C. for 24 h, and the product was collected by centrifugation and washed 4 times with ethanol. Get SiO 2 @Phenolic Resin.
[0041] (2) SiO after step (1) drying 2 @Phenolic resin is placed in a tube furnace, fed with nitrogen protection gas at an intake rate of 0.5L / min, firstly heated to 400°C at a rate of 6°C / min and kept for half an hour, then at a rate of 1°C / min Raise the temperature to 700°C and keep it for 2 hours to obtain SiO 2 @Carbon microspheres, then SiO 2 The @carbon was soaked in 15wt% hydrofluoric acid solution for 12 hours, then centrifuged to collect the product, and washed with water until neutral to obtain hollow carbon spheres.
[0042] (3) Ul...
Embodiment 3
[0046] (1) Add 1.3ml TEOS and 4ml ammonia water to the mixed solution consisting of 12ml ethanol and 4ml water and stir for 1 hour. Subsequently, 0.4 g of resorcinol and 0.56 ml of formaldehyde were added, and stirring was continued for 24 h. Subsequently, the reaction solution was hydrothermally reacted at 100° C. for 24 h, and the product was collected by centrifugation and washed 4 times with ethanol. Get SiO 2 @Phenolic Resin.
[0047] (2) SiO after step (1) drying 2 @Phenolic resin is placed in a tube furnace, fed with nitrogen protection gas at an intake rate of 0.5L / min, firstly heated to 400°C at a rate of 6°C / min and kept for half an hour, then at a rate of 1°C / min Raise the temperature to 700°C and keep it for 2 hours to obtain SiO 2 @Carbon microspheres, then SiO 2 The @carbon was soaked in 15wt% hydrofluoric acid solution for 12 hours, then centrifuged to collect the product, and washed with water until neutral to obtain hollow carbon spheres.
[0048] (3) Ul...
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