Silicon monoxide/graphite composite material, preparation method and application thereof
A technology of silicon oxide and composite materials, applied in electrochemical generators, active material electrodes, structural parts, etc., can solve problems such as high energy consumption and complicated preparation process
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Embodiment 1
[0033] (1) Preparation of silicon oxide / graphite composite material:
[0034] (1) Mixing: Take 200g of carbon-coated SiO x / C material (prepared by solid phase method, carbon coating mass percentage is 4wt%, SiO after coating x / C material reversible gram capacity 1620mAh / g), add 60g of asphalt (the asphalt after crushing and sieving, D50=2μm, the added amount accounts for 3% of the total weight), 1740g of artificial graphite. Put the above materials into the VC equipment and mix well;
[0035] (2) Pyrolysis: Put the above-mentioned mixed materials into the vertical coating equipment, first pass nitrogen gas, the gas flow rate is 120mL / min, heat up to 700°C at a rate of 2.5°C / min, and keep warm at 700°C for 1 Hours, continue to feed nitrogen, and cool naturally after calcination to obtain a composite negative electrode material in which silicon oxide is bonded to the surface of graphite particles, which is a silicon oxide / graphite composite material. The Mapping analysis dia...
Embodiment 2
[0052] (1) Preparation of silicon oxide / graphite composite material:
[0053] (1) Mixing: Take 200g of carbon-coated SiO x / C material (prepared by CVD method, carbon coating mass percentage is 2wt%, coated SiO x / C material reversible gram capacity 1500mAh / g), add 60g pitch (the pitch after crushing and sieving, D50=1.5μm, the addition amount accounts for 0.5% of the total weight, the typical mass percentage is 3%), 1740g artificial graphite . Put the above materials into the VC equipment and mix well;
[0054] (2) Pyrolysis: Put the above-mentioned mixed materials into the vertical coating equipment, first pass in nitrogen gas, the gas flow rate is 120mL / min, heat up to 600°C at a rate of 3°C / min, and keep at 600°C for 1 hours, continue to feed nitrogen gas, and cool naturally after calcination to obtain a composite negative electrode material in which silicon oxide is bonded to the surface of graphite particles, which is a silicon oxide / graphite composite material.
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Embodiment 3
[0066] (1) Preparation of silicon oxide / graphite composite material:
[0067] (1) Mixing: Take 200g of carbon-coated SiO x / C material (through the solid phase method or CVD method, the carbon coating mass percentage is 8wt%, and the coated SiO x / C material reversible gram capacity 1800mAh / g), add 60g of asphalt (the asphalt after crushing and sieving, D50=2.5μm, the added amount accounts for 5% of the total weight, the typical added mass percentage is 3%), 1740g of artificial graphite . Put the above materials into the VC equipment and mix well;
[0068] (2) Pyrolysis: Put the above-mentioned mixed materials into the vertical coating equipment, first pass in nitrogen gas, the gas flow rate is 120mL / min, heat up to 800°C at a rate of 5°C / min, and keep at 800°C for 1 hours, continue to feed nitrogen gas, and cool naturally after calcination to obtain a composite negative electrode material in which silicon oxide is bonded to the surface of graphite particles, which is a sil...
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