Niobium doped lithium titanate as a high rate anode material for Li-ion batteries

被引：236

作者：

Tian, Bingbing ^{[1
]}

Xiang, Hongfa ^{[1
]}

Zhang, Le ^{[1
]}

Li, Zhong ^{[1
]}

Wang, Haihui ^{[1
]}

机构：

[1] S China Univ Technol, Sch Chem & Chem Engn, Guangzhou 510640, Guangdong, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2010年 / 55卷 / 19期

关键词：

Lithium-ion batteries; Li4Ti5O12; Li4Ti4.95Nb0.05O12; Anode materials; ELECTROCHEMICAL PROPERTIES; RECHARGEABLE BATTERIES; NEGATIVE ELECTRODE; SPINEL LI4TI5O12; RATE PERFORMANCE; STORAGE; COMPOSITE; INSERTION; BEHAVIOR; CELLS;

D O I：

10.1016/j.electacta.2010.04.068

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Niobium doped lithium titanate with the composition of Li4Ti4.95Nb0.05O12 has been prepared by a sol-gel method. X-ray diffraction (XRD) and scanning electron microscope (SEM) are employed to characterize the structure and morphology of Li4Ti4.95Nb0.05O12. The Li4Ti4.95Nb0.05O12 electrode presents a higher specific capacity and better cycling performance than the Li4Ti5O12 electrode prepared by the similar process. The Li4Ti4.95Nb0.05O12 exhibits an excellent rate capability with a reversible capacity of 135 mAh g(-1) at 10C, 127 mAh g(-1) at 20C and even 80 mAh g(-1) at 40C. Electrical resistance measurement and electrochemical impedance spectra (EIS) reveal that the Li4Ti4.95Nb0.05O12 exhibits a higher electronic conductivity and faster lithium-ion diffusivity than the Li4Ti5O12, which indicates that niobium doped lithium titanate (Li4Ti4.95Nb0.05O12) is promising as a high rate anode for the lithium-ion batteries. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：5453 / 5458

页数：6

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