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Start Over Author "Ji, Xiaobo" Journal journal of power sources
23 results on '"Ji, Xiaobo"'

23. Exploration of ion migration mechanism and diffusion capability for Na3V2(PO4)2F3 cathode utilized in rechargeable sodium-ion batteries.

Author

Song, Weixin, Ji, Xiaobo, Wu, Zhengping, Yang, Yingchang, Zhou, Zhou, Li, Fangqian, Chen, Qiyuan, and Banks, Craig E.

Subjects
*DIFFUSION, *SODIUM compounds, *CRYSTAL structure, *EXTRACTION (Chemistry), *CHEMICAL potential, *LITHIUM-ion batteries
Abstract

Abstract: NASICON-type Na3V2(PO4)2F3 is employed as a promising cathode for sodium-ion batteries in order to explore the ion-migration mechanism and diffusion capability. Two kinds of Na sites, namely Na(1) site and Na(2) site exist in the crystal structure per formula unit to accommodate a total of three sodium ions. The ion at Na(2) site with half occupation extracts first and inserts the last due to its high chemical potential, while the whole extraction/insertion of two ions between 1.6 and 4.6 V vs. Na+/Na can produce three plateaus in charge/discharge processes because of the reorganization of ions. The first discharge capacity of 111.6 mAh g−1 with retention of 97.6% after 50 cycles could be obtained by electrochemical testing at 0.091C. Electrochemical activation and/or structural reorganization of the system by cycling could improve the diffusion coefficient of sodium with a comparatively large magnitude of 10−12 cm2 s−1, though many influences on the resistance factors also can be attributed to the cycling process. Such work is of fundamental importance to the progression of sodium-based batteries to be fully realized and be implemented over existing Li-ion based batteries. [Copyright &y& Elsevier]

Published
2014
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