Lithium ion battery cathode material and preparation method thereof, and lithium ion battery
A technology of lithium-ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as poor conductivity, achieve the effects of overcoming poor conductivity, cheap price, and improving electrochemical performance
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Embodiment 1
[0023] This embodiment provides a preparation method of lithium ion battery negative electrode material, comprising the following steps:
[0024] (1) Put silicon monoxide powder (300 mesh in particle size) in a crucible, put it into an atmosphere furnace, raise the temperature to 750°C under the protection of argon atmosphere, and heat it at this temperature for 6 hours, the monoxide Silicon undergoes a disproportionation reaction to form a composite material of silicon and silicon dioxide. Since silicon monoxide will agglomerate after high-temperature firing, the particle size of the final mixture is relatively large. The mixture includes part of unreacted silicon monoxide and Composite material of silicon and silicon dioxide. In the composite material of silicon and silicon dioxide, silicon is distributed in the silicon dioxide matrix, and the particle size of the silicon is 1nm in the nanometer scale, silicon accounts for about 5% of the mass of the first mixture, and silic...
Embodiment 2
[0032] This embodiment provides a preparation method of lithium ion battery negative electrode material, comprising the following steps:
[0033] (1) Put silicon monoxide powder (particle size 100 mesh) in a crucible, put it into an atmosphere furnace, raise the temperature to 950°C under the protection of argon atmosphere, and heat at this temperature for 3 hours, the monoxide Silicon undergoes a disproportionation reaction to form a composite material of silicon and silicon dioxide. Since silicon monoxide will agglomerate after high-temperature firing, the particle size of the final mixture is relatively large. The mixture includes part of unreacted silicon monoxide and Composite material of silicon and silicon dioxide. In the composite material of silicon and silicon dioxide, silicon is distributed in the silicon dioxide matrix, and the particle size of the silicon is nanometer 3nm, silicon accounts for about 16% of the mass of the first mixture, and silicon dioxide account...
Embodiment 3
[0039] This embodiment provides a preparation method of lithium ion battery negative electrode material, comprising the following steps:
[0040] (1) Put silicon monoxide powder (particle size 400 mesh) in a crucible, put it into an atmosphere furnace, heat up to 1000°C under the protection of argon atmosphere, and heat it at this temperature for 1 hour, the monoxide Silicon undergoes a disproportionation reaction to form a composite material of silicon and silicon dioxide. Since silicon monoxide will agglomerate after high-temperature firing, the particle size of the final mixture is relatively large. The mixture includes part of unreacted silicon monoxide and Composite material of silicon and silicon dioxide. In the composite material of silicon and silicon dioxide, silicon is distributed in the silicon dioxide matrix, and the particle size of the silicon is nanometer 10nm, silicon accounts for about 23% of the mass of the first mixture, and silicon dioxide accounts for abou...
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