Preparation and electrochemical performances of submicro-TiP2O7 cathode for lithium ion batteries
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- 作者：Yuwan Hao (1)
Chao Wu (1) (2)
Yongli Cui (1)
Kun Xu (1)
Zheng Yuan (1)
Quanchao Zhuang (1) - 关键词：TiP2O7 ; Electrochemical performance ; EIS ; Cathode ; Lithium ion batteries
- 刊名：Ionics
- 出版年：2014
- 出版时间：August 2014
- 年：2014
- 卷：20
- 期：8
- 页码：1079-1085
- 全文大小：926 KB
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Chao Wu (1) (2)
Yongli Cui (1)
Kun Xu (1)
Zheng Yuan (1)
Quanchao Zhuang (1)
1. Li-ion Batteries Lab, School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou, 221116, China
2. School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, 221116, China - ISSN：1862-0760
文摘
The TiP2O7 with a cubic 3?×-?×- superstructure was synthesized by a liquid-assisted solid-state reaction, and characterized by x-ray diffraction, scanning electron microscopy, cyclic voltammogram, galvanostatic charge/discharge testing, and electrochemical impedance spectroscopy (EIS) technique. The results showed that there was only one step of intercalation into TiP2O7, corresponding to a pair redox (E Li/Li +--.74/2.48?V). The initial discharge capacity of TiP2O7 was 110?mAh/g at a current density of 15?mA/g, and the capacity retention was 76.12?% of the initial discharge capacity after 100?cycles. The EIS of TiP2O7 electrode consisted of two semicircles in organic electrolyte, which was attributed to SEI resistance as well as the contact resistance, and charge transfer process, respectively. A suitable model was proposed to explain the impedance response of the insertion TiP2O7 material of lithium ion batteries.