尖晶石钛酸锂的三乙醇胺辅助溶胶-凝胶法合成及其性能  

Synthesis and Electrochemical Properties of Spinel Li_4Ti_5O_(12) by Triethanolamine Assisted Sol-gel Method

作　　者：麦发任[1] 吴显明[1,2] 陈上[1,2] 曾姝[1] 刘金练[1] 赵俊海[1] 

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：《材料科学与工程学报》2013年第1期122-125,111,共5页Journal of Materials Science and Engineering

摘　　要：以三乙醇胺为配位剂,Ti(OC4H9)4和LiAc·2H2O为原料,通过溶胶-凝胶法制备锂离子电池负极材料尖晶石Li4Ti5O12。通过X射线衍射、扫描电子显微镜、循环伏安、电化学阻抗和恒流充放电分析检测产物的结构、形貌及电化学性能。结果表明:配位剂的用量对Li4Ti5O12结构及电化学性能有显著影响,其中三乙醇胺与Ti摩尔比为0.8时,Li4Ti5O12具有良好的的电化学性能。1.0C下,其首次放电容量为153.0mAh·g-1,35次循环后放电容量仍为139.9mAh·g-1,容量保持率为91.5%。Spinel Li4 Ti5 Oi2 as an anode material for Li-ion battery was synthesized by triethanolamine assisted sol-gel method using triethanolamine, tetrabutyl titanate and lithium acetate dihydrate as starting materials. Phase identification, surface morphology and electrochemical properties of the products were characterized by X-ray diffraction, scanning electron microscopy, galvanostatic charge-discharge, cyclic voltammetry, and electrochemical impedance spectroscopy, ect.. The results show that the molar ratio of triethanolamine to titanium has significant effect on the structural and electrochemical properties of Li4 Ti5 O12. Li4Ti5O12 shows better electrochemical performance when the molar ratio of triethanolamine to titanium is 0.8. When cycled at the charge-discharge rate of 1.0C, the initial discharge capacity of Li4Ti^O12is 153.0 mAh＇g-1. The discharge capacity decreases to 139.9mAh-g l after 35 cycles with a capacity retention of 91.5%.

关 键 词：锂离子电池 负极材料 LI4TI5O12 溶胶-凝胶 三乙醇胺 

分 类 号：TB34[一般工业技术—材料科学与工程]