石墨烯负载纳米二硫化钴的制备及其在锂离子电池方面的应用研究

Preparation of graphene loaded nano-sized CoS and its application in lithium-ion batteries

采用二次水热法将纳米二硫化钴负载于石墨烯上,并通过结构表征和电化学性能测试,探讨了纳米二硫化钴/石墨烯材料作为锂离子电池负极的性能。电容量测试结果表明:在电流密度为100 mA/g条件下,二硫化钴/石墨烯复合材料的首周充放电容量分别为1 610 mA·h/g和774 mA·h/g,测算出的库伦效率为48.1%;循环性能测试结果表明:经过50次循环测算后的复合材料的放电比容量为302 m A·h/g,容量保持率为33.4%;倍率性能测试结果表明:当电流密度回复到100 mA/g时,复合材料的比容量恢复至550 mA·h/g。实验制备的纳米二硫化钴/石墨烯复合材料在锂电池负极的应用上表现出了优异的循环性能和倍率性能。

Graphene loaded nano-sized CoS2 were prepared by secondary hydrothermal method.The properties of nano-sized CoS2/GP composites as anode materials for lithium ion batteries were studied by structural characterization and electrochemical performance testing.The capacitance test results showed that the first cycle charge-discharge capacity of CoS2/GP composite were 1 610 mA·h/g and 774 mA·h/g respectively at 100 mA/g current density.And the calculated coulomb efficiency was 48.1%.The cycle performance test results showed that the specific discharge capacity was 302 mA·h/g and the capacity retention rate was 33.4% after 50 times cycles.The rate performance test results showed that when the current density teturned to 100 mA/g,the specific capacity restored to 550 mA·h/g.CoS2/GP composites anode exhibited excellent cycling and rate performance.