Silicon/mesoporous carbon composites with three-dimensional conductive network structure
A composite material and network structure technology, applied in the field of silicon/mesoporous carbon composite materials, can solve the problems of low capacity and short life of lithium ion batteries, and achieve the effect of improving electrochemical contact, good elasticity and high conductivity
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Embodiment example 1
[0032] 1.61g phenol, add 10ml 1.5 mol L -1 KOH solution, stirred for 20min, added 5.0ml of 37% formaldehyde solution, stirred for 1h, added 3.0g of F-127 into 20g of methanol, stirred until transparent, added into phenolic resin, stirred at 65°C for 1h. Cool to room temperature, use 1.0 mol L -1 HNO 3 The pH of the solution was adjusted to 7. The obtained solution was rotary evaporated at 55°C, and the obtained resin was dispersed in methanol, stirred, and centrifuged at 5000r min -1 , 20min, filtered to obtain a methanol solution of phenolic resin. The obtained solution was transferred to a Petri dish, volatilized at room temperature for 10 h, and solidified at 120° C. for more than 24 h to obtain a transparent material. The obtained material was put into a tube furnace with nitrogen protection at 10°C min -1 The temperature was raised to 400°C at a high speed, kept for 4 hours, then raised to 600°C, kept for 3 hours, and then naturally cooled to room temperature to obta...
Embodiment example 2
[0036] 1.61g phenol, add 10ml 1.5 mol L -1 KOH solution, stirred for 20min, added 5.0ml of 37% formaldehyde solution, stirred for 1h, added 3.0g of F-127 into 20g of methanol, stirred until transparent, added into phenolic resin, stirred at 65°C for 1h. Cool to room temperature, use 1.0 mol L -1 HNO 3 The pH of the solution was adjusted to 7. The obtained solution was rotary evaporated at 55°C, and the obtained resin was dispersed in methanol, stirred, and centrifuged at 5000r min -1 , 20min, filtered to obtain a methanol solution of phenolic resin. The carbon nanotubes were acidified, ultrasonicated for 3 hours in 40ml of concentrated sulfuric acid and concentrated nitric acid (3:1, V / V), washed with deionized water and filtered until neutral, and dried in vacuum for later use.
[0037] Take carbon nanotubes accounting for 10% of the total mass and 20% silicon powder (50-100nm) according to a predetermined ratio, add appropriate amount of methanol respectively, ultrasoni...
Embodiment example 3
[0041] 1.61g phenol, add 10ml 1.5 mol L -1 KOH solution, stirred for 20min, added 5.0ml of 37% formaldehyde solution, stirred for 1h, added 3.0g of F-127 into 20g of methanol, stirred until transparent, added into phenolic resin, stirred at 65°C for 1h. Cool to room temperature, use 1.0 mol L -1 HNO 3 The pH of the solution was adjusted to 7. The obtained solution was rotary evaporated at 55°C, and the obtained resin was dispersed in methanol, stirred, and centrifuged at 5000r min -1 , 20min, filtered to obtain a methanol solution of phenolic resin. The carbon nanotubes were acidified, ultrasonicated for 3 hours in 40ml of concentrated sulfuric acid and concentrated nitric acid (3:1, V / V), washed with deionized water and filtered until neutral, and dried in vacuum for later use.
[0042] Take carbon nanotubes accounting for 10% of the total mass and silicon powder (50-100nm) with a mass of 40% according to a predetermined ratio, add appropriate amount of methanol respect...
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