Preparation method of negative material of carbon-doped stannic dioxide nanowire lithium battery
A tin dioxide and negative electrode material technology, applied in the field of lithium ion batteries, can solve the problems of thermodynamic instability, affecting the cycle performance and capacity of electrode materials, agglomeration, fusion, etc., to improve cycle stability, electrode specific capacity and cycle performance. Optimize and improve the effect of electrode capacity
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[0029] A method for preparing a carbon-doped tin dioxide nanowire lithium battery negative electrode material, comprising the following steps:
[0030] 1) Heat and melt 80-100 parts of phenol at 40-45°C, and add 10-30 parts of sodium hydroxide solution with a mass concentration of 20% and 80-160 parts of a sodium hydroxide solution with a mass concentration of 37 % formaldehyde solution, then heat up to 65-75°C, react for 40-80 minutes, then cool down, then add hydrochloric acid to adjust to neutral, vacuum dry to obtain low molecular weight soluble phenolic resin;
[0031] 2) Dissolve the low-molecular-weight resole phenolic resin obtained in step 1) in 1500-4000 parts of ethanol, add 40-200 parts of porogen, stir until it is clear and transparent, and let it stand at room temperature until the ethanol is volatilized. Then place it in an oven with a temperature of 100-150°C and heat it for 1-2 days to cross-link and solidify the low-molecular-weight resole phenolic resin to o...
Embodiment 1
[0037]Heat and melt 90 parts by weight of phenol at 40°C, add 20 parts by weight of 20% sodium hydroxide solution and 160 parts by weight of 37% formaldehyde solution dropwise while stirring, then raise the temperature to 70°C, and react for 60 minutes. Cool, adjust the solution to neutral with hydrochloric acid, and dry in vacuum to obtain low molecular weight resole phenolic resin.
[0038] The above-mentioned phenolic resin is dissolved in 3000 parts by weight of ethanol, and 75 parts by weight of porogen polyoxyethylene-polyoxypropylene block copolymer Pluronic P123 (PEO 20 -PPO 70 -PEO 20 ), stirred until clear and transparent. Stand at room temperature, and after the ethanol evaporates, heat the product in an oven at 100°C for 1 day to cross-link and solidify the phenolic resin. Under a nitrogen atmosphere, the product was carbonized in a tube furnace at 700 °C for 5 hours to obtain a mesoporous carbon material with continuous channels.
[0039] At 80 °C, the above m...
Embodiment 2
[0041] Heat and melt 100 parts by weight of phenol at 40°C, add 20 parts by weight of 20% sodium hydroxide solution and 160 parts by weight of 37% formaldehyde solution dropwise while stirring, then raise the temperature to 70°C, and react for 60 minutes. Cool, adjust the solution to neutral with hydrochloric acid, and dry in vacuum to obtain low molecular weight resole phenolic resin. The above-mentioned phenolic resin was dissolved in 2000 parts by weight of ethanol, and 90 parts by weight of porogen polyoxyethylene hexadecyl ether Brij-56 (CH 3 (CH 2 ) 15 (OCH 2 CH 2 ) 10 OH), stirred until clear and transparent. Stand at room temperature, and after the ethanol evaporates, heat the product in an oven at 100°C for 1 day to cross-link and solidify the phenolic resin. Under a nitrogen atmosphere, the product was carbonized in a tube furnace at 800 °C for 3 hours to obtain a mesoporous carbon material with continuous channels.
[0042] At 100°C, soak the above-mentioned ...
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