A silicon matrix composite material for lithium ion battery and a preparation method thereof
A technology of lithium-ion batteries and silicon-carbon composite materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of low specific capacity of silicon-carbon negative electrode materials, low initial discharge efficiency, volume effect of silicon-carbon negative electrode materials and initial discharge Low efficiency and other issues, to achieve high capacity, solve the volume effect, and solve the effect of low first-time Coulombic efficiency
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[0008] It is a silicon-carbon composite material for lithium-ion batteries. Its structure is a core-shell structure. The core-shell structure includes a core and a shell covering the core; the core includes 70%-95% silicon, 4%- 20% titanium (Ti) and 5%-15% niobium (Nb), silicon is the inner layer of the core, titanium (Ti) and niobium (Nb) elements are dispersed on the surface of the inner layer; the shell layer is made of graphene and carbon nano The tube is composed of a mass ratio of 11%-42% to the inner core, and the above percentages are mass percentages.
[0009] Its preparation steps are as follows:
[0010] Step 1. Collect the waste silicon powder cut by the diamond wire, place it under an argon (Ar) atmosphere at a high temperature of 1000° C. for 8 hours, and obtain a powdery or massive solid;
[0011] Step 2, placing the product obtained in step 1 in a ball mill under the protection of an argon (Ar) atmosphere at 450 r / min for 4 hours, and using a magnet to remove ...
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