Improving the sodiation performance of Na2Ti3O7 through Nb-doping

被引：40
作者：
Chen, Jizhang [1 ]
Zhou, Xiaoyan [1 ]
Mei, Changtong [1 ]
Xu, Junling [2 ]
Wong, Ching-Ping [2 ,3 ]
机构：
[1] Nanjing Forestry Univ, Coll Mat Sci & Engn, Nanjing 210037, Jiangsu, Peoples R China
[2] Chinese Univ Hong Kong, Dept Elect Engn, Hong Kong, Hong Kong, Peoples R China
[3] Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA
来源：
ELECTROCHIMICA ACTA | 2017年 / 224卷
关键词：
Na-ion batteries; anode; Na2Ti3O7; sodiation; Nb-doping; SODIUM-ION BATTERIES; SOLID-ELECTROLYTE INTERPHASE; ANODE MATERIAL; ELECTROCHEMICAL PERFORMANCE; HARD CARBON; STORAGE MECHANISM; COMPOSITE ANODE; LITHIUM; LI4TI5O12; CONDUCTIVITY;
D O I：
10.1016/j.electacta.2016.12.094
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Na2Ti3O7 has attracted increasing attention as a promising anode material for Na-ion batteries. However, the low electronic conductivity of Na2Ti3O7 brings about kinetic problems for sodiation. In this study, we report Nb-doped Na2Ti3O7 synthesized from a facile sol-gel method. The obtained Na2Ti2.97Nb0.03O7 has increased unit cell volume and lowered band gap compared to the pristine Na2Ti3O7. The Na2Ti2.97Nb0.03O7 shows a high reversible capacity of 189.7 mAh g(-1) at 0.2C, a great high-rate performance of 89.4 mAhg(-1) at 5C, and great cyclability of 78.5% after 500 cycles. Specifically, the rate capability of Na2Ti2.97Nb0.03O7 is considerably superior to that of the pristine Na2Ti3O7. The improved sodiation performance suggests Nb-doping is an effective modification for Na2Ti3O7 anode materials. (C) 2016 Elsevier Ltd. All rights reserved.
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收藏
页码：446 / 451
页数：6
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