Effect of VO4 3− substitution for PO4 3− on electrochemical properties of the Li3Fe2(PO4)3 cathode materials

Yonggang Yang, Yongguang Zhang, Zhengshen Hua, Xin Wang, Huifen Peng, Zhumabay Bakenov

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

In this research, VO4 3− substitution was used to improve electrochemical properties of the Nasicon Li3Fe2(PO4)3 cathode material. The VO4 3− substitution resulted in formation of a homogeneous compound Li3Fe2(PO4)3-x(VO4)x in a composition range of x ≤ 0.45; further introduction of VO4 3− led to precipitation of some other phases. It was shown that the VO4 3− substituted samples presented discharging capacity higher than that of bare non-substituted Nasicon and the reported Ti4+ and Mn2+ doped ones. The Li3Fe2(PO4)2.55(VO4)0.45 material exhibited excellent cycling stability and rate capability, and retained a capacity of 91.8 mAh g−1 after 60 cycles at 2C charge-discharge rate. This value is one of the highest reported to date for the Li3Fe2(PO4)3 compound, and was about 48% higher than that of the latter. The electrochemical performance enhancements for the VO4 3− substituted samples were attributed to the reduction of charge transfer resistance, increase of electrical conductivity, and fast lithium ion diffusion behavior. Hence, the obtained results proved that the VO4 3− anion substitution for PO4 3− is a powerful technique to improve the electrochemical performance of the studied Nasicon compound.

Original languageEnglish
Pages (from-to)547-552
Number of pages6
JournalElectrochimica Acta
Volume219
DOIs
Publication statusPublished - Nov 20 2016

Keywords

  • Anion substitution
  • LiFe(PO)
  • Lithium ion battery
  • Mixed anion effect
  • Nasicon cathode

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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