Effect of VO43-Substitution for PO43-on Electrical Conductivity in the Nasicon Li3Sc2(PO4)3Compound

Shuxin Geng, Yonggang Yang, Yongguang Zhang, Wei Ding, Xin Wang, Huifen Peng, Zhumabay Bakenov

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Abstract In this work, VO43- substitution for PO43- in the Nasicon structured Li3Sc2(PO4)3 was used to enhance its ionic conductivity. The VO43- substitution resulted in a homogeneous compound Li3Sc2(PO4)3-x(VO4)x within a wide composition range of 0 ≤ x ≤ 1.2; further increase in x led to precipitation of the crystalline phases VPO5, V(PO3)3 and ScVO4. Electrical conductivity of the VO43--substituted samples increased with the VO43- content, and the sample with x=1.5 exhibited the highest conductivity (8.41×10-3 S m-1) at room temperature and the lowest activation energy (39.65 kJ mol-1). The obtained conductivity was two orders of magnitude higher than that of the non-substituted sample and nine times higher than those of the Zr4+ and SiO44--substituted compounds. The present study demonstrates that the VO43- anion substitution for PO43- is a promising technique to improve ionic conductivity of the Nasicon compound.

Original languageEnglish
Article number25172
Pages (from-to)327-333
Number of pages7
JournalElectrochimica Acta
Volume176
DOIs
Publication statusPublished - Jul 18 2015

Keywords

  • LiSc(PO)
  • Nasicon
  • fast ionic conductor
  • mixed anion effect
  • solid state electrolyte

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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