Energy Storage Science and Technology ›› 2016, Vol. 5 ›› Issue (3): 341-348.doi: 10.3969/j.issn.2095-4239.2016.03.012

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Na3V2(PO4)3/C cathode materials with preferred(113)orientation for sodium ion batteries

NI Qiao, WU Chuan, BAI Ying, LIU Yuanchang, CHEN Guanghai, WU Feng   

  1. Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, China
  • Received:2016-04-05 Revised:2016-04-15 Online:2016-05-01 Published:2016-05-01

Abstract:

In this paper, the Na3V2(PO4)3/C cathode materials with (113) preferred orientation for sodium ion batteries were obtained by a simple sol-gel adjuvant electrospinning method. The electrochemical performance of two different morphology Na3V2(PO4)3/C materials were compared, which were synthetized through different polymers Polyvinylpyrrolidone (PVP) and Polyethylene oxide (PEO) under the optimal conditions, it further demonstrates that the significant role of electrospinning method to prepare the (113) preferred Na3V2(PO4)3/C materials. At the same current density of 0.1C, NVP-PVP exhibited an initial specific capacity of 112.5 mA·h/g, and still stabling at 98.1 mA·h/g after 50 cycles, however, NVP-PEO can only keep at 34 mA·h/g. Even after 100 cycles, NVP-PVP can show a reversible capacity of 88.2 mA·h/g. The results show that PVP has the advantage at fabricating the distinct nanofiber structure and the uniform conductive carbon framework, which will promote the electrochemical performance of Na3V2(PO4)3.

Key words: sodium ion battery, Na3V2(PO4)3, electrospinning, preferred orientation