Co-doped Li4Ti5O12 nanosheets with enhanced rate performance for lithium-ion batteries

被引：61
作者：
Liang, Qiu [1 ,2 ,3 ]
Cao, Ning [1 ,2 ]
Song, Zhonghai [1 ,2 ]
Gao, Xuejiao [1 ,2 ]
Hou, Lina [1 ,2 ]
Guo, Tirong [1 ,2 ]
Qin, Xue [1 ,2 ]
机构：
[1] Tianjin Univ, Sch Sci, Dept Chem, Tianjin 300072, Peoples R China
[2] Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China
[3] Tianjin Univ, Tianjin Key Lab Mol Optoelect Sci, Tianjin 300072, Peoples R China
来源：
ELECTROCHIMICA ACTA | 2017年 / 251卷
关键词：
Co2+-doped Li4Ti5O12; High rate performance; Good electrochemical reversibility; Lithium ion batteries; HIGH-RATE CAPABILITY; ANODE MATERIAL; ELECTROCHEMICAL PERFORMANCE; HYDROTHERMAL SYNTHESIS; COMPOSITE; CONDUCTIVITY; INSERTION; TITANATE; BEHAVIOR; STORAGE;
D O I：
10.1016/j.electacta.2017.08.121
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Co2+-doped Li4Ti5O12 (LTO) in the form of Li4Ti5-xCoxO12 (x = 0, 0.10, 0.15, 0.20) is prepared using a facile hydrothermal method. The doping of Co2+ leads to a decrease of the charge transfer resistance and improvement of the lithium ion diffusion coefficient. The as-prepared samples, Li4Ti5-xCoxO12 (x = 0.15) exhibits the best cycling stability and rate capability as anode material for lithium ion batteries, which delivers the initial specific capacity of 168.3,163,159,156.4,145.9,140.4,130.9 and 112.6 mAh g(-1) at 1, 2, 5, 10, 15, 20, 30 and 50C (1C = 175 mAh g(-1)) rate in the voltage range of 1.0-2.5 V respectively, and a discharge capacity of 109.3 mAh g(-1) after 1000 cycles at 50C. In addition, it keeps a discharge capacity of 150.8 mAh g(-1) (95.1% retention) at 5C even after 3000 cycles. Therefore, Co2+ doping technique provides an effective approach to improve electrochemical performances of LTO. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码：407 / 414
页数：8
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