Porous spherical silicon-based composite negative electrode material and preparation method thereof and battery
A technology of porous spherical and negative electrode materials, applied in negative electrodes, battery electrodes, lithium batteries, etc., can solve problems such as difficulty in further improving battery energy density, increasing specific surface area of silicon-based negative electrode materials, and poor battery cycle performance.
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[0040] The present application also provides a method for preparing a porous spherical silicon-based composite negative electrode material, which is used to prepare the porous spherical silicon-based composite negative electrode material in any of the above embodiments. The preparation method of the porous spherical silicon-based composite negative electrode material includes the following steps: adding silicon and silicon oxide for heat treatment to obtain a sintered body with an inner core; performing a CVD vapor deposition operation on the sintered body with the inner core to obtain porous spherical particles coated with deposited carbon; The carbon-coated porous spherical particles are subjected to a carbon-coating operation to obtain a porous spherical silicon-based negative electrode material.
[0041] In the preparation method of the above-mentioned porous spherical silicon-based composite negative electrode material, silicon oxide and silicon are subjected to a heat tre...
Embodiment 1
[0102] Mix 100g of silicon oxide with a particle size of 1±0.1μm and 30g of silicon powder with a particle size of 1±0.1μm uniformly to obtain a silicon mixture, put the silicon mixture into an atmosphere furnace, heat treat at 1000°C for 2h under the protection of argon, and cool To room temperature, obtain Si / Si-SiOx sintered product; Si / Si-SiOx sintered product is mixed with isopropanol in a ratio of 1:4, and ball milled in a sand mill until the particle size of Si / Si-SiOx sintered product is 100nm, Si / Si-SiOx slurry is obtained; the Si / Si-SiOx slurry is spray-dried under nitrogen protection, the spray drying inlet temperature is 180°C, the outlet temperature is 80°C, and the porous spherical Si / Si-SiOx is obtained by spray drying Precursor: Add the porous spherical Si / Si-SiOx precursor into the CVD gas-phase coating furnace, feed the mixed gas of nitrogen and acetylene, and heat up to 900°C for vapor-phase chemical deposition. A carbon coating layer is deposited on the par...
Embodiment 2
[0104] Mix 100g of silicon oxide with a particle size of 4±0.1μm and 10g of silicon powder with a particle size of 2±0.1μm uniformly to obtain a silicon mixture, put the silicon mixture into an atmosphere furnace, heat treat at 1050°C for 2h under argon protection, and cool to room temperature to obtain a Si / Si-SiOx sinter; mix the Si / Si-SiOx sinter and ethanol in a ratio of 1:4, and ball mill in a sand mill until the particle size of the Si / Si-SiOx sinter is 200nm to obtain Si / Si-SiOx slurry; the Si / Si-SiOx slurry is spray-dried under the protection of nitrogen, the inlet temperature of the spray drying is 200°C, the outlet temperature is 90°C, and the porous spherical Si / Si-SiOx precursor is obtained by spray drying ; Put the porous spherical Si / Si-SiOx precursor into the CVD gas-phase coating furnace, pass in the mixed gas of nitrogen and acetylene, raise the temperature to 900 °C, conduct vapor-phase chemical deposition, keep the reaction for 2 hours, and in the porous sph...
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