超声浸渍包覆石墨的嵌脱锂性能

Lithium Insertion-deinsertion Properties of Coated Graphite by Ultrasonic Impregnation Technique

研究了超声浸渍包覆石墨的微观结构和在不同电解质溶液体系中的电化学嵌脱锂性能。结果表明 ,超声浸渍有利于石墨表面的均层包覆和深度包覆 ,可以防止溶剂化锂离子嵌入石墨层间 ,这种复合材料在1mol/LLiClO4/EC +DMC电解液中的首次放电容量达 30 8 2mA·h/g ,也可以在PC基电解液中进行有效的电化学循环。

The microstructure and electrochemical performance of coated graphite obtained by ultrasonic impregnation technique were investigated. The results show that ultrasonic impregnation technique favors coating of graphite profoundly and uniformly, at the same time prevents the co-intercalation of solvated lithium ions into graphite layers effectively. The charge-discharge capacity of the composite material attains 308.2 mA·h/g in 1 mol/L LiClO 4/EC+DMC(1∶1) electrolyte. The electrode can also be recycled in propylene carbonate based electrolyte solution.