期刊
CERAMICS INTERNATIONAL
卷 43, 期 13, 页码 10326-10332出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2017.05.063
关键词
B. Microstructure; E. Batteries; E. Electrodes; Sodium-ion batteries; Anatase TiO2; Zinc doping
资金
- National Natural Science Foundation of China [51564002, 21606055]
To improve the performance of anatase TiO2 as an anode material for sodium-ion batteries, Zn2+-doped TiO2/C composites are synthesized by a co-precipitation method. The results of XRD, EPR and XIS demonstrate that Zn2+ occupies at the Ti4+ site of TiO2 to form a solid-solution, resulting in an expansion of lattice and an increase of Ti3+ content. The expansion of lattice can enhance the stability of the crystal structure of TiO2. The increase of Ti3+ content can improve the conductivity of TiO2. Therefore; Ti0.94Zn0.06O2/C delivers a reversible capacity of 160 mA h g(-1) with a capacity retention of 96% after 100 cycles at 5 C. Even charged/discharged at 10 C, this sample still exhibits a reversible capacity of 117 mA h g(-1), comparing to 86 mA h g(-1) for TiO2/C. The enhanced electrochemical performances can be ascribed to the improvement of the conductivity and the structural stability of TiO2 due to Zn2+-doping. Therefore, Ti0.94Zn0.06O2/C is an attractive anode material of sodium-ion batteries.
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