A kind of hard carbon composite material and its preparation method and application
A composite material and hard carbon technology, applied in the preparation/purification of carbon, carbon fluoride, structural parts, etc., can solve the problems of unfavorable battery cycle, hard carbon surface is difficult to form a protective film, high initial irreversible capacity, etc., to achieve Optimized balance of capacity and cycle life, effect of short cycle time
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Embodiment 1
[0038] 1g of commercial hard carbon was heat-treated at 1400°C for 3 hours in an argon atmosphere; the heat-treated hard carbon and 2 grams of polyvinylidene fluoride were separately placed in two magnetic boats, and then the magnetic boat was placed in a heat treatment furnace, and then placed in a In an argon atmosphere, heat treatment was performed at 400° C. for 3 hours to obtain a hard carbon composite material. The product is analyzed by XPS, and the surface contains carbon fluoride, see figure 1 .
[0039] The hard carbon composite material prepared in this embodiment is used as the working electrode, the metal sodium is used as the counter electrode, the glass fiber membrane is used as the separator, and NaPF 6 The propylene carbonate (PC) / ethyl methyl carbonate (EMC) solution is used as the electrolyte, and the charge and discharge test is carried out. The charge and discharge curve is as follows figure 2 shown. Constant current charge and discharge test (current ...
Embodiment 2
[0043] 1g of commercial hard carbon was heat-treated at 1200°C for 4 hours in an argon atmosphere; the heat-treated hard carbon and 1 gram of polytetrafluoroethylene were separately placed in two magnetic boats, and then the magnetic boat was placed in a heat treatment furnace, and then placed in a In an argon atmosphere, heat treatment was performed at 450° C. for 2 hours to obtain a hard carbon composite material.
Embodiment 3
[0045] 1g of commercial hard carbon was heat-treated at 1500°C for 2 hours in an argon atmosphere; the heat-treated hard carbon and 1 gram of polyperfluoroethylene propylene were separately placed in two magnetic boats, and then the magnetic boat was placed in a heat treatment furnace. Then, heat treatment was performed at 500° C. for 1 hour in an argon atmosphere to obtain a hard carbon composite material.
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