高温固相法合成Li4Ti5O12及其电化学性能研究  

Preparation and Electrochemical Performance of Li_4Ti_5O_(12) Anode Material by High-temperature Solid-state Method

作　　者：于小林[1] 吴显明[1,2] 李叶华[1] 丁心雄 陈上[1,2] 

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：《广东化工》2017年第7期61-63,共3页Guangdong Chemical Industry

基　　金：国家自然科学基金项目(21263004);吉首大学研究生校级科研项目(Jdy16017);吉首大学化学化工学院研究生专项科研课题;“锰锌钒产业技术”协同创新中心研究生科研创新课题

摘　　要：以锐钛矿TiO_2和Li_2CO_3为原料,无水乙醇作为分散剂,采用高温固相法合成锂离子电池负极材料钛酸锂(Li_4Ti_5O_(12))。通过X射线衍射(XRD)、扫描电子显微镜(SEM)、恒流充放电和电化学阻抗等方法对不同条件合成的材料结构、形貌及电化学性能进行表征。结果表明:最佳条件为煅烧温度750℃,煅烧时间16 h,可以制备出性能良好的纯相Li_4Ti_5O_(12)材料。在电压区间1~2.5 V范围内进行充放电,在0.5 C下,首次放电比容量为153.44 mAh/g,循环50次后,容量保持率为95.43%。在5 C大倍率下,放电比容量仍保持在108.64 mAh/g,材料表现出良好的循环性能和倍率性能。Li4Ti5O12 anode material for lithium-ion batteries was synthetized from solid-state method using Li2CO3 and TiO2 as the starting materials, Ethanol as a dispersing agent. The structure, surlhce morphology and electrochemical properties of the materials were characterized by X-ray diffractometry （XRD）, scanning electron microscopy （SEM）, galvanostatic charge-discharge experiments and electrochemical impedance spectroscopy. The results show that, the pure and good anode materials can be prepared when the calcination temperature is 750 ℃, and the calcination time is 16 h. Its initial discharge specific capacity of 153.44 mAh/g in the voltage range 1.0-2.5 V at the rate 0.5 C, and the capacity retention rate was 95.43 % after 50 cycles. At a high rate of 5 C, the discharge specific capacity remains at 108.64 mAb/g, and the material exhibits good cycle perlbrmance and rate performance.

关 键 词：锂离子电池 负极材料 LI4TI5O12 煅烧温度 煅烧时间 

分 类 号：TQ[化学工程]