A kind of silicon-based negative electrode material for lithium ion battery and preparation method thereof
A silicon-based negative electrode material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as pole piece processing performance, compaction density limitation, affecting pole piece cell capacity and energy density, etc. Achieve the effect of improving electrochemical performance and relieving contact stress
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Embodiment 1
[0046] A preparation method of a silicon-based negative electrode material for a lithium ion battery, comprising the following steps:
[0047] A. Take 500g of silicon-based composite material, 0.5g of polyvinylidene fluoride, and 0.5g of carbon nanotubes into a ball mill jar containing 250g of N-methylpyrrolidone, stir evenly, take out and dry, then grind and crush to obtain carbon nanotubes on the surface Silicon-based composite material for cladding;
[0048] B. adding the silicon-based composite material prepared in the above step A into the fluidized bed cavity;
[0049] C. Get 125g polymethyl methacrylate and add in 1250g dimethyl carbonate, stir until the solid dissolves completely;
[0050] D. The polymethyl methacrylate solution prepared in the above step C is pumped into the fluidized bed at a rate of 80 g / min, and the reaction is completed to obtain a silicon-based negative electrode material coated with polymethyl methacrylate.
Embodiment 2
[0052] A preparation method of a silicon-based negative electrode material for a lithium ion battery, comprising the following steps:
[0053] A. Take 500g of silicon-based composite material and add it to the fluidized bed cavity;
[0054] B. Take 5g of sodium carboxymethylcellulose, 50g of carbon nanotubes and graphene and add it to 1500g of deionized water. After stirring evenly, pump it into the fluidized bed at a rate of 50g / min. The inlet temperature is 200°C. After the sample is taken out, it is crushed to obtain a silicon-based composite material coated with a mixture of carbon nanotubes and graphene;
[0055] C. adding the silicon-based composite material obtained in the above step B into the fluidized bed cavity;
[0056] D. Get 200g two (2,3-cycloglycerol carbonate) carbonates and add in 4000g ethylene carbonate, stir until the solid dissolves completely;
[0057] E. The bis(2,3-cycloglycerol carbonate) carbonate solution prepared in the above step D is pumped int...
Embodiment 3
[0059] A preparation method of a silicon-based negative electrode material for a lithium ion battery, comprising the following steps:
[0060] A. Get 500g of the silicon-based composite material and add it to the ethanol solution of nickel nitrate, mix it evenly, dry it, and grind it; then place it in a chemical vapor deposition furnace to grow carbon nanofibers; after the reaction, drop to room temperature, take it out and grind it to obtain A silicon-based composite material with a carbon nanomaterial coating on the surface;
[0061] B. adding the silicon-based composite material prepared in the above step A into the fluidized bed cavity;
[0062] C. Get 25g tetrakis (1,2-glyceryl sulfite) pyromellitic acid ester and add in the mixed solution of ethylene carbonate and dimethyl carbonate of 125g, stir until the solid dissolves completely;
[0063] D. The tetrakis (1,2-cyclosulfite) pyromellitic acid ester solution prepared in the above step C is pumped into the fluidized bed...
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