水热法制备纳米片钛酸锂及其性质研究  

Preparation and electrochemical performance of Li_4Ti_5O_(12) nanosheets by hydrothermal method

作　　者：于小林[1] 吴显明[1,2] 丁心雄 李叶华[1] 刘立瑶 石青峰 

机构地区：[1]吉首大学化学化工学院,湖南吉首416000 [2]湘西自治州矿产与新材料技术创新服务中心,湖南吉首416000

出　　处：《现代化工》2018年第2期83-86,共4页Modern Chemical Industry

基　　金：国家自然科学基金项目(21263004);国家自然科学基金项目(51762016);吉首大学研究生校级科研项目(Jdy16017)

摘　　要：以钛酸四丁酯(TBT)、氢氧化锂(LiOH·H_2O)为原料,采用水热法合成锂离子电池负极材料纳米片状钛酸锂(Li4Ti5O12)。通过X-射线衍射、扫描电子显微镜、恒流充放电及电化学阻抗等技术对合成材料的结构、表面形貌及电化学性能进行表征。结果表明,制备的材料为片状结构,具有较大的比表面积,分散性较好。在电压为1.0~2.5 V,以0.5 C的倍率进行充放电,首次放电比容量高达180.2 m Ah/g,循环50次后,容量仍保持162.2 m Ah/g。在10 C高倍率下,放电比容量仍高达130.7 m Ah/g,材料表现出优异的循环性能和倍率性能。Li4Ti5O12 nanosheets anode material for lithium-ion batteries is synthesized by hydrothermal method using tetrabutyl titanate（ TBT） and lithium hydroxide（ LiOH·H2O） as raw materials. The structure,surface morphology and electrochemical properties of the prepared material are characterized by X-ray diffraction,scanning electron microscopy,galvanostatic charge-discharge,electrochemical impedance spectroscopy and cyclic voltammetry. The results show that the prepared materials are in the form of nanosheets,which have large specific surface area and good dispersivity. The initial discharge capacity is as high as 180. 2 m Ah·g-1 when the charge-discharge is performed at 0. 5 C-rate in the range of 1. 0-2. 5 V. The capacity remains 162. 18 m Ah·g-1 after being cycled for 50 times. At a higher rate of 10 C-rate,the discharge capacity is still as high as 130. 7 m Ah·g-1. This material exhibits excellent cycle performance and rate performance.

关 键 词：锂离子电池 纳米片钛酸锂 负极材料 水热法 

分 类 号：TB23[一般工业技术—工程设计测绘]