用作锂离子电池负极的FeS2微球的制备及性能

以氯化亚铁和硫代硫酸钠为原料, 采用水热法一步合成了由FeS₂纳米片堆积的FeS₂微球. 通过调控铁源与硫源的摩尔比及水热合成时间, 并结合X射线衍射(XRD)和扫描电子显微镜(SEM)表征结果推测了FeS₂的生长机理, 筛选出最优条件以提升其电化学性能. 电化学测试结果表明, 在500 mA/g的电流密度条件下, 材料的首次放电/充电容量可分别达到905和800 mA·h·g ^-1, 首次库伦效率达到88.4%; 在2000 mA/g的大电流密度条件下, 500次放电/充电循环后依然稳定保持350 mA·h·g ^-1的可逆容量.

Synthesis and Electrochemical Performance of FeS2 Microspheres as an Anode for Li-ion Batteries

FeS2 nanosheets assembled FeS2 microspheres were synthesized using ferric chloride(Ⅱ)and sodium thiosulfate as raw materials via one-pot hydrothermal method.We speculate the FeS2 growth mechanism by regulating the molar ratio of iron source to sulfur source and hydrothermal time.Meanwhile,we combine with XRD and SEM characterization results and filter optimal conditions to improve the electrochemical performance.At the current density of 500 mA/g,first discharge/charge capacity can reach 905 mA·h·g^-1 and 800 mA·h·g^-1,respectively,and the coulombic efficiency is 88.4%.Even at high current density of 2000 mA/g,the FeS2 exhibit excellent cycling behavior with a stable capacity of 350 mA·h·g^-1 after 500 cycles.