Li_4Ti_5O_(12)/Li_(1.3)Al_(0.3)Ti_(1.7)(PO_4)_3复合负极材料的制备及性能  

Preparation and Characterization of Li_4Ti_5O_(12)/Li_(1.3)Al_(0.3)Ti_(1.7)(PO_4)_3 Composite Anode Materials

作　　者：吴显明[1,2] 陈上[1,2] 于小林[1] 陈守彬[1] 麦发任[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：《精细化工》2016年第9期961-964,990,共5页Fine Chemicals

基　　金：国家自然科学基金项目(21263004)~~

摘　　要：采用溶胶-凝胶法合成了Li_4Ti_5O_(12)/Li_(1.3)Al_(0.3)Ti_(1.7)(PO_4)_3复合负极材料,通过X射线衍射、扫描电子显微镜、恒电流充放电、循环伏安和电化学阻抗研究复合材料的结构、形貌及电化学性能。结果表明:溶胶-凝胶法能合成纯相Li_4Ti_5O_(12)/Li_(1.3)Al_(0.3)Ti_(1.7)(PO_4)_3复合负极材料颗粒均匀。与纯相Li_4Ti_5O_(12)相比,引入Li_(1.3)Al_(0.3)Ti_(1.7)(PO_4)_3的Li_4Ti_5O_(12)复合负极材料具有更低的锂离子嵌入/脱出阻抗,Li_(1.3)Al_(0.3)Ti_(1.7)(PO_4)_3质量分数为1%、2%、3%、4%、5%的Li4Ti5O12复合负极材料首次放电容量比纯相Li_4Ti_5O_(12)分别提高了6.2%、11.8%、15.5%、8.0%和2.0%。充放电循环20次后,Li_(1.3)Al_(0.3)Ti_(1.7)(PO_4)_3质量分数为3%的Li_4Ti_5O_(12)复合负极材料循环性能最好,平均每次循环容量衰减率为0.022%。Li4Ti5 O12/Li1. 3Al0. 3 Ti1. 7 （ PO4 ） 3composite were synthesized by sol-gel method. The structure, morphology and electrochemical properties of the composite were characterized using X-ray diffraction, scanning electron microscopy, galvanostatic charge-discharge experiments, cyclic voltammetry and electrochemical impedance spectroscopy, respectively. The results show that Li4Ti5O12/Li1.3Al0.3Ti1.7 （PO4）3 composite can be prepared by sol-gel technique and the particles of the composite are uniform. The Li4 Ti5 O12/Li1. 3 Alo. 3 Ti1. 7 （ PO4 ） 3 composite have lower Li-ion insertion/ extraction impedance comparing with the pure Li4Ti5 O12. When the Li4 Ti5 O12/Lil. 3 Al0. 3 Ti1. 7 （ 1904 ） 3 composite are doped with mass fraction of 1% , 2% , 3 % , 4% , and 5 % of Li1. 3 Al0. 3 Ti1. 7 （ PO4 ） 3, the first discharge capacity of the corresponding composite increases by 6.2% , 11.8% , 15.5% ,8.0% , and 2. 0%, respectively. Furthermore, they are higher than that of the pure Li4Ti5 O12. The composite doped with 3% （mass fraction） Ei1.3 Al0.3 Ti1.7 （PO4）3 shows the best cycling performance with a capacity loss of 0. 022% per cycle when 20 cycles are conducted.

关 键 词：锂离子电池 LI4TI5O12 复合材料 电化学 功能材料 

分 类 号：TM912.9[电气工程—电力电子与电力传动]