Structural and electrochemical performances of Li4Ti5-xZrxO12 as anode material for lithium-ion batteries

被引:123
作者
Li, Xing [1 ,2 ]
Qu, Meizhen [1 ]
Yu, Zuolong [1 ]
机构
[1] Chinese Acad Sci, Chengdu Inst Organ Chem, Chengdu 610041, Peoples R China
[2] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
关键词
Lithium-ion battery; Spinel lithium titanate; Nano-particle; Doping; Rate capability; ELECTRICAL-CONDUCTIVITY; LI4TI5O12; ELECTRODE; SPINEL; COMPOSITE; BEHAVIOR;
D O I
10.1016/j.jallcom.2009.07.176
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Zr-doped Li4Ti5O12 in the form of Li4Ti5-xZrxO12 (x=0, 0.05, 0.1 and 0.2) was prepared by solid-state reaction in an air atmosphere. The dopant Zr partly entered the lattice structure of Li4Ti5O12, and the excessive part existed as the impurity of ZrO2. Zr-doping did not change the electrochemical reaction process of Li4Ti5O12, but greatly affected its morphology and particle size. The particle size of the Zr-doped Li4Ti5O12 sample was less than 100 nm and had less agglomeration. Zr-doping obviously improved the rate capability of Li4Ti5O12 via the generation of small particle size and less agglomeration, however, a high amount of Zr-doping was adverse to the electrochemical performance probably due to much ZrO2 impurity contained in the Li4Ti5O12. Li4Ti4.9Zr0.1O12 exhibited a relatively good rate capability and cycling stability. At the charge-discharge rate of 5C, 10C and 20C, its discharge capacities were 143 mAh/g, 132 mAh/g and 118 mAh/g, respectively. After 100 cycles at 5C, it remained at 141 mAh/g. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:L12 / L17
页数:6
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