中文摘要：

以锐钛矿型TiO_2和LiOH·H_2O为主要原料,采用球磨喷雾技术辅助高温固相法合成了钛酸锂/石墨烯复合材料.使用X射线衍射（XRD）、扫描电子显微镜（SEM）对样品进行物相分析和形貌表征,通过恒流充放电和循环伏安测试对其电化学性能进行表征.结果表明：通过该方法制备得到了结晶度高、呈微球形的纯相钛酸锂粉体;掺入石墨烯后,物相结构并未发生改变,且未见其他杂质出现,而晶粒尺寸减小,晶粒形貌由规则外形变为近球形.该种结构改变导致钛酸锂材料的锂离子扩散系数由2.64μm^2/s提高至5.82μm^2/s,是电化学性能提高的内在原因.充放电测试结果表明,首次放电比容量由162mA·h/g提高到182mA·h/g,有望今后得到应用.

英文摘要：

Li_4Ti_5O_（12）/Graphene composite material was synthesized by using anatase TiO_2 and LiOH·H_2O through high-temperature solid-state reaction aided with the technology of ball milling and spraying.The phase,morphology and electrochemical performance of the samples were characterized by X-ray diffraction（XRD）and scanning electron microscopy（SEM）,charge-discharge and cyclic voltammetry experiments.The results showed that well-crystallized Li_4Ti_5O_（12） powders with micro-spherical shape were synthesized.The introduction of graphene did not change the purity of the prepared powders,but reduced the grain size and changed the shape of the graphene modified Li_4Ti_5O_（12） anode powder.Such modification led to significant improvement in Li ion conductivity.The diffusion coefficient in the anode material increased from 2.64 μm~2/s to 5.82μm~2/s,which was the internal cause for the enhanced electrochemical performance.The initial specific capacity was improved from 162 mA·h/g to 182 mA·h/g,implying great potential of the material for future application.