Method for preparing sulfur-based cathode material
A positive electrode material, sulfur-based technology, applied in the field of preparation of lithium ion positive electrode materials, can solve the problems of low reversible lithium storage capacity of vulcanized polyacrylonitrile, difficulty in achieving uniform mixing of polyacrylonitrile and sulfur, etc., to suppress loss and reduce corrosion Effect
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[0015] Please refer to figure 1 , an embodiment of the present invention provides a method for preparing a sulfur-based positive electrode material, comprising:
[0016] S10, at a first temperature, dissolving polyacrylonitrile and elemental sulfur in a first solvent in proportion to form a first solution;
[0017] S11, at the second temperature, transfer the first solution to a second solvent to rapidly precipitate the polyacrylonitrile and elemental sulfur to form a precipitate, wherein the polyacrylonitrile and elemental sulfur are insoluble in the first solvent Two solvents, and the second temperature is lower than the first temperature, and the temperature difference between the first temperature and the second temperature is greater than or equal to 50°C; and
[0018] S12, filtering the precipitate, and performing heat treatment so that the polyacrylonitrile and elemental sulfur undergo a chemical reaction to generate vulcanized polyacrylonitrile.
[0019] In step S10,...
Embodiment 1
[0023] Weigh 8g of sublimed sulfur and 4g of polyacrylonitrile respectively and add them to 200ml of dimethylformamide, in a constant temperature oil bath at 120°C until the raw materials are completely dissolved to form the first solution, and quickly transfer the first solution to a room temperature Rapid precipitation in 400ml of deionized water was completed within 10 seconds. The precipitate was filtered and dried. After drying, the precipitate was heated to 400°C and reacted at constant temperature for 6 hours to obtain the final product.
Embodiment 2
[0025] Weigh 8g of sublimed sulfur and 2g of polyacrylonitrile respectively and add them to 200ml of dimethylformamide, in a constant temperature oil bath at 120°C until the raw materials are completely dissolved to form the first solution, and quickly transfer the first solution to a room temperature Rapid precipitation in 400ml of ethanol is completed within 10 seconds, the precipitate is filtered and dried, and after drying, the precipitate is heated to 400°C and reacted at constant temperature for 6 hours to obtain the final product.
[0026] Please refer to figure 2 , figure 2 It is the scanning electron micrograph of the precipitate that obtains in embodiment one, from figure 2 It can be seen that the polyacrylonitrile is uniformly coated on the surface of elemental sulfur. Please refer to image 3 , image 3 It is the scanning electron micrograph of the precipitate that obtains in embodiment two, from image 3 It can be seen that the polyacrylonitrile is uniform...
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