a c/si/sio x Materials and their preparation methods and applications
A slurry and powder technology applied to C/Si/SiOx materials and their preparation. The application field of the C/Si/SiOx materials can solve the problems of restricting the energy density of lithium batteries and achieve stable cycle performance and high Charge-discharge specific capacity, the effect of simple preparation process
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Embodiment 1
[0031] 100g of pure SiO with a particle size D50 of 5-10 μm x Powder, 100g of PEDOT (polyethylenedioxythiophene) aqueous solution with a mass fraction of 3%, add deionized water and mix to form a slurry with a solid content of 30%, and then stir the slurry at 95°C until the water is completely volatilize to obtain a precursor mixture;
[0032] The resulting precursor mixture was transferred to a rotary furnace with a rotation speed of 0.3 rpm, and calcined in nitrogen at a pressure of 0.15 MPa at 800 °C for 1 h to obtain C / SiO x composite materials;
[0033] Replace the nitrogen in the rotary furnace with a mixture of nitrogen and silane gas with a volume ratio of 99:1, keep the pressure in the furnace at 0.15MPa, and continue calcination at 800°C for 1h to obtain Si / C / SiO x composite materials;
[0034] Replace the mixed gas of nitrogen and silane gas in the rotary furnace with a mixed gas of nitrogen and acetylene with a volume ratio of 50:50, keep the pressure in the fur...
Embodiment 2
[0036] 100g of pure SiO with a particle size D50 of 5-10 μm x Powder, 166g of PEDOT / PSS [poly(3,4-ethylenedioxythiophene)-polystyrenesulfonic acid] aqueous solution with a mass fraction of 3% was added to deionized water and mixed to form a slurry with a solid content of 40%. Then the slurry was stirred at 90°C until the water was completely volatilized to obtain a precursor mixture;
[0037] The resulting precursor mixture was transferred to a rotary furnace with a rotation speed of 1 rpm, and calcined in nitrogen at a pressure of 0.2 MPa and 900 °C for 1.5 h to obtain C / SiO x composite materials;
[0038]Replace the nitrogen in the rotary furnace with a mixture of nitrogen and silane gas with a volume ratio of 99:1, keep the pressure in the furnace at 0.2MPa, and continue calcination at 900°C for 1.5h to obtain Si / C / SiO x composite materials;
[0039] Replace the mixed gas of nitrogen and silane gas in the rotary furnace with the mixed gas of nitrogen and natural gas with...
Embodiment 3
[0041] 100g of pure SiO with a particle size D50 of 5-10 μm x Powder, 133g of PEDOT (polyethylenedioxythiophene) aqueous solution with a mass fraction of 3% was added to deionized water and mixed to form a slurry with a solid content of 35%, and then the slurry was stirred at 95°C until the water was completely volatilize to obtain a precursor mixture;
[0042] The resulting precursor mixture was transferred to a rotary furnace with a rotation speed of 1 rpm, and calcined in argon at 0.2 MPa and 900 °C for 1.5 h to obtain C / SiO x composite materials;
[0043] Replace the argon in the rotary furnace with a mixture of argon and silane gas at a volume ratio of 99:1, keep the pressure in the furnace at 0.2MPa, and continue calcination at 900°C for 1.5h to obtain Si / C / SiO x composite materials;
[0044] Replace the mixed gas of argon and silane gas in the rotary furnace with the mixed gas of argon and acetylene with a volume ratio of 40:50, keep the pressure in the furnace at 0....
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