Silicon-carbon composite material as well as preparation method and application thereof
A silicon-carbon composite material, carbon ball technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of low tap density, limited relief of silicon volume expansion, poor electrical conductivity, etc., and achieve simple steps and low cost. The effect of low cost, high first coulomb efficiency
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Embodiment 1
[0033] This embodiment provides a method for preparing a silicon-carbon composite material, comprising the following steps:
[0034] 1) 0.6 g of silicon nanoparticles was treated with 64 mL of concentrated sulfuric acid (98%) / hydrogen peroxide (40%) mixed solution with a volume ratio of 3:1. The reaction was carried out in a water bath at 85°C for 1 h, cooled and centrifuged, and finally placed Dry in a blast oven at 70°C to obtain hydroxylated silicon nanoparticles.
[0035] 2) Take 0.6g of hydroxylated silicon nanoparticles in a round bottom flask, add 100mL of toluene, control the temperature of the oil bath to 110°C, add 0.5mL of 3-aminopropyltriethoxysilane after the temperature stabilizes and reflux for 6h, cool and centrifuged, and finally dried in a common blast oven at 70°C to obtain silicon amide nanoparticles.
[0036] 3) Take 6.1g of phenol and melt it at 45°C, add 1.3mL of 5M NaOH solution, stir at 45°C for 10min, then add 13mL of formaldehyde, adjust the tempera...
Embodiment 2
[0041] This embodiment provides a method for preparing a silicon-carbon composite material, comprising the following steps:
[0042] 1) 0.6g of silicon nanoparticles was treated with 64mL of concentrated sulfuric acid (98%) / hydrogen peroxide (40%) mixed solution with a volume ratio of 3:1. The hydroxylated silicon nanoparticles were obtained by drying in an ordinary blast oven at 70°C.
[0043] 2) Take 0.6g of hydroxylated silicon nanoparticles in a round bottom flask, add 100mL of toluene, control the temperature of the oil bath to 100°C, add 0.5mL of 3-aminopropyltrimethoxysilane after the temperature stabilizes and reflux for 6h, cool and centrifuged, and finally dried in a common blast oven at 70°C to obtain silicon amide nanoparticles.
[0044] 3) Take 6.1g of phenol and melt it at 45°C, add 1.3mL of 5M NaOH solution, stir at 45°C for 10min, then add 13mL of formaldehyde, adjust the temperature to 70°C, react for 1h, stop the reaction and adjust with 5M HCl When the pH ...
Embodiment 3
[0048] This embodiment provides a method for preparing a silicon-carbon composite material, comprising the following steps:
[0049] 1) 0.6g of silicon nanoparticles was treated with 64mL of concentrated sulfuric acid (98%) / hydrogen peroxide (40%) mixed solution with a volume ratio of 3:1. Dry in a vacuum oven at 50° C. to obtain hydroxylated silicon nanoparticles.
[0050] 2) Take 0.6g of hydroxylated silicon nanoparticles in a round bottom flask, add 100mL of toluene, control the temperature of the oil bath to 100°C, add 0.5mL of 3-aminopropyltriethoxysilane after the temperature stabilizes and reflux for 6h, cool and centrifuged, and finally dried in a vacuum oven at 50° C. to obtain silicon amide nanoparticles.
[0051] 3) Take 6.1g of phenol and melt it at 45°C, add 1.3mL of 5M NaOH solution, stir at 45°C for 10min, then add 13mL of formaldehyde, adjust the temperature to 70°C, react for 1h, stop the reaction and adjust with 5M HCl When the pH of the system reaches 7, 2...
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