Silicon carbon negative electrode material of lithium ion battery and preparation method of silicon carbon negative electrode material
A technology for lithium-ion batteries and negative electrode materials, which can be used in battery electrodes, secondary batteries, circuits, etc., and can solve the problems of poor composite effect of silicon-carbon negative electrodes
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Embodiment 1
[0021] Add 10g of PVA into 1000g of silicon oxide aqueous solution (solid content 15%), stir evenly for 0.5h, then spray dry to obtain surface-coated silicon oxide particles, and then roast them at 1000°C by mechanical crushing Depolymerize to obtain modified silica particles; mix the modified silica with artificial graphite and asphalt according to the ratio of 20:50:30, and then heat it to 400°C at 2°C / min in the reactor, and the stirring speed is 50rpm. Fusion coating is carried out; then the fusion coating material is carbonized in a nitrogen atmosphere at a rate of 2°C / min to 1000°C, and then sieved to obtain a modified silicon-carbon negative electrode material.
Embodiment 2
[0023] Add 5g of phenolic resin to 1000g of silicon alcohol solution (solid content 10%), stir evenly for 0.5h, then perform low-temperature vacuum drying treatment to obtain surface-coated silicon particles, and then roast them at 1100°C in airflow mode Depolymerize to obtain modified silicon particles; mix modified silicon with natural graphite and phenolic resin at a ratio of 10:70:20VC, and then heat to 700°C at 5°C / min in the reactor, stirring at 30rpm, for fusion coating Then, the fused coating material is carbonized in an argon atmosphere at a rate of 1 °C / min to 1100 °C, and then sieved to obtain a modified silicon-carbon negative electrode material.
Embodiment 3
[0025] Add 5g of sucrose to 1000g of silicon oxide aqueous solution (solid content 15%), stir evenly for 0.5h, then perform low-temperature vacuum drying to obtain surface-coated silicon oxide particles, and then roast them at 600°C, using airflow Depolymerization is carried out to obtain modified silicon oxide particles; the modified silicon oxide is mixed with artificial graphite, carbon fiber, and pitch according to 15:55:5::20 ball milling, and then the fusion coating material is mixed in an argon atmosphere with 1 °C / min is raised to 1100 °C for carbonization treatment, followed by sieving treatment to obtain the modified silicon carbon negative electrode material.
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