Journal of Inorganic Materials ›› 2019, Vol. 34 ›› Issue (10): 1097-1102.doi: 10.15541/jim20190058

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Synthesis of Na3V2(PO4)2F3@V2O5-x as Cathode Material for Sodium-ion Battery

WANG Jia-Hu1,WANG Wen-Xin1,DU Peng1,HU Fang-Dong1,JIANG Xiao-Lei1(),YANG Jian2()   

  1. 1. School of Chemistry and Chemical Engineering, Linyi University, Linyi 276005, China
    2. School of Chemistry and Chemical Engineering, Shandong University, Jinan 250000, China
  • Received:2019-01-28 Revised:2019-03-26 Online:2019-09-23 Published:2019-05-29
  • Contact: JIANG Xiao-Lei,YANG Jian E-mail:jiangxiaolei@lyu.edu.cn;yangjian@sdu.edu.cn
  • Supported by:
    National Natural Science Foundation of China(21701079);Shandong Provincial Natural Science Foundation(ZR2017BB016);Undergraduate Innovation and Entrepreneurship Training Program(201710452017);Undergraduate Education Reform Project of Shandong Province(Z2018S006)

Abstract:

Low energy/power density and inferior cycling stability are bottlenecks to restrict the applications of sodium-ion batteries. Recently, coating the surface of cathode material by metal oxides containing oxygen vacancies, was regarded as an effective strategy to improve electrical conductivity and power/energy density. In this study, Na3V2(PO4)2F3@V2O5-x nanosheets were synthesized via hydrothermal strategy followed by heat treatment. X-ray diffraction, transmission electron microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis were applied to investigate the structure of Na3V2(PO4)2F3@V2O5-x. As a cathode of sodium- ion batteries, Na3V2(PO4)2F3@V2O5-x delivers excellent cycling stability and rate capability. It exhibits an initial discharge capacity of 123 mAh?g -1 at 0.2C, and a discharge capacity of 109 mAh?g -1 after 140 cycles. At 1C, its initial reversible capacity is 72 mAh?g -1, which remains 84% after 500 cycles. The outstanding electrochemical property could be ascribed to its enhanced sodium-diffusion and improved electronic conductivity induced by disordered surface coating. Furthermore, it encourages more investigations into practical sodium-ion battery applications.

Key words: cathode material, oxygen deficient, electrochemical performance, sodium-ion battery

CLC Number: 

  • O646