期刊
JOURNAL OF POWER SOURCES
卷 273, 期 -, 页码 784-792出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2014.09.153
关键词
Sodium ion batteries; Electrospin; Cathode; Nanofibers; Na3V2(PO4)(3)/C; Carbon
资金
- National 973 program [2009CB220100, 2015CB251100]
- Program for New Century Excellent Talents in University [NCET-12-0047, NCET-13-0033]
- Beijing science and Technology Commission [Z131100003413001]
- Research Fund for the Doctoral Program of Higher Education of China [20121101110042]
Budding willow branches shaped Na3V2(PO4)(3)/C nanofibers were successfully synthesized by a simple electrospinning technique with Poly(vinyl pyrrilidone) (PVP). The Na3V2(PO4)(3)/C nanoparticles that anchored on the nanofibers surface seemed like the willow buds; the inner core of the nanofibers, which composed Na3V2(PO4)(3), looked like willow twig and the uniform carbon layer was same with willow bark. Such special morphology played a vital role in improving cycle stability and rate capability of the electrode due to the conductive network built up by nanofibers. The Na3V2(PO4)(3)/C nanofibers cathode exhibited an initial specific capacity of 106.8 mAh g(-1) at a current density of 0.2C, still stabling at 107.2 mAh g(-1) after 125 cycles with excellent cycle stability. Moreover, a capacity retention of 95.7% was obtained when Na3V2(PO4)(3)/C nanofibers cycled stepwise from 0.2 to 2C. Good electrochemical performance should be ascribed to both the special morphology and preferential growth of the (113) plane. The simple synthesis technique and good electrochemical performance suggests that this material with the special shape of budding willow branches is a promising cathode for sodium ion batteries. (C) 2014 Elsevier B.V. All rights reserved.
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