J. Mater. Sci. Technol. ›› 2021, Vol. 66: 121-127.DOI: 10.1016/j.jmst.2020.05.076

• Research Article • Previous Articles     Next Articles

A multiphase sodium vanadium phosphate cathode material for high-rate sodium-ion batteries

Chuan Wanga,b,1, Hai Longa,b,1, Lijiao Zhoub, Chao Shena,b,*(), Wei Tangc, Xiaodong Wangd, Bingbing Tiane, Le Shaof, Zhanyuan Tianf, Haijun Sua,b, Keyu Xiea,b,*()   

  1. aResearch & Development Institute of Northwestern Polytechnical University in Shenzhen, Northwestern Polytechnical University, Shenzhen 518057, China
    bState Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi’an 710072, China
    cSchool of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China
    dCentral Analytical Research Facility, Queensland University of Technology, Australia
    eInternational Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China
    fShaanxi Coal and Chemical Technology Institute Co., Ltd, Jinye Road, Xi’an 710070, China;
  • Received:2020-05-07 Revised:2020-05-28 Accepted:2020-05-29 Published:2021-03-10 Online:2021-04-01
  • Contact: Chao Shen,Keyu Xie
  • About author:kyxie@nwpu.edu.cn (K. Xie).
    *Corresponding authors at: Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Northwestern Polytechnical University, Shenzhen 518057, China.E-mail addresses: shenchao@nwpu.edu.cn (C. Shen),
    First author contact:

    1Chuan Wang and Hai Long contributed equally to this work.

Abstract:

The unsatisfactory rate capability and poor cycling stability at high rate of sodium-ion batteries (SIBs) have impeded their practical applications. Herein, a Na3V2(PO4)3/Na3V3(PO4)4 multiphase cathode materials for high-rate and long cycling SIBs was successfully synthesized by regulation the stoichiometric ratio of raw materials. The combined experiment and simulation results show that the multiphase materials consisted of NASICON structural phase Na3V2(PO4)3 and layered structure phase Na3V3(PO4)4, possess abundant phase boundaries. Electrochemical experiments demonstrate that the multiphase materials maintain a remarkable reversible capacity of 69.0 mA h g-1 even at an ultrahigh current density of 100 C with a high capacity retention of 81.25 % even after 10,000 cycles. Na3V2(PO4)3/Na3V3(PO4)4 electrode exhibits a higher working voltage, superior rate capability and better cycling stability than Na3V2(PO4)3 electrode, which indicates that the introduction of second phase can be an effective strategy for the development of novel cathode materials for SIBs.

Key words: Sodium-ion batteries, High-rate capability, Multiphase, Na3V2(PO4)3, Na3V3(PO4)4