石墨烯/钛酸锂复合锂离子电池负极材料制备及性能研究

Preparation and Electrochemical Properties of Li_4Ti_5O_(12)/Graphene Composite as Anode Materials for Li Ion Battery

采用水热法成功制备了Li_4Ti_5O_(12)/石墨烯纳米复合材料,用XRD,SEM等手段对复合材料的结构和形貌进行表征,分析结果表明纳米Li_4Ti_5O_(12)颗粒完整且分布均匀,与石墨烯交叠在一起,有效地阻止了双方的团聚;通过恒流充放电测试对其电化学性能进行分析研究,结果表明Li_4Ti_5O_(12)/石墨烯的储锂性能优于钛酸锂,30次循环后,可逆容量为260m Ah/g,循环性能优异;石墨烯量越大,Li_4Ti_5O_(12)/石墨烯纳米复合材料的可逆容量越高。

The Li4Ti5O12/grapheme nanocomposites were successfully prepared by hydrothermal method. The structure and morphology of com-posites were characterized by XRD and SEM. The results showed that the Li4Ti5O12 nanoparticles uniformly overlapped grapheme which could effectively prevent the agglomeration. The electrochemical performance of the composites was analyzed by the constant current charge-discharge test.The electrochemical properties of the Li4Ti5O12/graphene were better than that of the lithium titanate. After 30 cycles, the reversible capacity of Li4Ti5O12/graphene was 260 m Ah/g, and the cycling performance was excellent. With the increase of the amount of graphene, the reversible capacity of Li4Ti5O12/grapheme nanocomposites was higher.