Silicon monoxide composite negative electrode material, preparation method thereof and lithium ion battery
A technology of silicon oxide and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems affecting the cycle performance of silicon oxide-based silicon carbon negative electrode materials, low conductivity of SiO2, ion conductivity, and distribution uniformity Problems such as inability to be strictly controlled to achieve the effects of alleviating electronic contact deactivation, improving cycle performance, and improving kinetic performance
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[0033] In a first aspect, the present invention provides a method for preparing a silicon oxide composite negative electrode material, comprising the following steps:
[0034] S1. Provide silicon oxide powder, the silicon oxide powder is silicon oxide powder without disproportionation treatment;
[0035] S2. Carrying out carbon coating on the silicon oxide powder to obtain a first precursor;
[0036] S3. growing carbon nanofibers in situ on the surface of the first precursor to obtain a second precursor;
[0037] S4. Performing secondary granulation on the second precursor to obtain the silicon oxide composite negative electrode material.
[0038] Wherein, in step S1, the preparation method of the silicon oxide powder is as follows: after mixing the silicon powder and the silicon dioxide powder uniformly, heating to generate silicon monoxide gas in an inert atmosphere or a vacuum environment, and then cooling and precipitating to obtain SiO2 block: crushing and pulverizing t...
Embodiment 1
[0066] Silicon oxide composite negative electrode material, its preparation method steps are as follows:
[0067] S1. Provide silicon oxide powder, the silicon oxide powder is silicon oxide powder without disproportionation treatment; the preparation method of the silicon oxide powder is: mix silicon powder and silicon dioxide powder evenly Finally, in an inert atmosphere or a vacuum environment, heat up to 1400 ° C to generate silicon monoxide gas, cool and precipitate on the deposition plate to obtain a silicon oxide block; the silicon oxide block is broken by a jaw crusher into Particles with an average particle size of 0.5-8 mm are then pulverized and pulverized by airflow to obtain silicon oxide powder with a particle size D50 of 0.1-1 μm; wherein the molar ratio of the silicon powder to the silicon dioxide powder is 0.5:0.5; The particle size D50 of the silicon powder is 1-100 μm, the particle size D50 of the silicon dioxide powder is 0.01-1 μm; the chemical formula of t...
Embodiment 2
[0072] Silicon oxide composite negative electrode material, its preparation method steps are as follows:
[0073] S1. Provide silicon oxide powder, the silicon oxide powder is silicon oxide powder without disproportionation treatment; the preparation method of the silicon oxide powder is: mix silicon powder and silicon dioxide powder evenly Finally, in an inert atmosphere or a vacuum environment, heat up to 900°C to generate silicon monoxide gas, which is cooled and precipitated on a deposition plate to obtain a silicon oxide block; the silicon oxide block is crushed by a jaw crusher into Particles with an average particle size of 0.5-8 mm are then pulverized and pulverized by airflow to obtain silicon oxide powder with a particle size D50 of 0.1-1 μm; wherein, the molar ratio of the silicon powder to the silicon dioxide powder is 0.6:0.4; The particle size D50 of the silicon powder is 1-100 μm, the particle size D50 of the silicon dioxide powder is 0.01-1 μm; the chemical for...
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