Improvement in the Energy Density of Na3V2(PO4)3 by Mg Substitution

Atsushi Inoishi, Yuto Yoshioka, Liwei Zhao, Ayuko Kitajou, Shigeto Okada

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Na3V2(PO4)3, with a NASICON-type structure, is a promising cathode material for use in sodium-ion batteries based on a two-electron reaction and operating at 3.4 V. Herein, we report the synthesis of Na3+xV2-xMgx(PO4)3 (x=0.1 to 0.7) for use as a cathode material in sodium-ion batteries. In this work, Na3.2V1.8Mg0.2(PO4)3 was found to exhibit a larger reversible capacity than the theoretical capacity of undoped Na3V2(PO4)3, as a result of the larger number of Na+ in the initial composition, as well as access to the V4+/V5+ redox couple. In contrast, although Mg-rich samples such as Na3.5V1.5Mg0.5(PO4)3 showed a relatively clear plateau for the V4+/V5+ redox couple, the total discharge capacities were lower than that of the undoped Na3V2(PO4)3 because of the irreversibility in the V4+/V5+ redox region. ICP data clearly indicated that Mg2+ are stable within the NASICON structure during redox cycling and that Na+ is the charge carriers in this cathode.

Original languageEnglish
Pages (from-to)2755-2759
Number of pages5
JournalChemElectroChem
Volume4
Issue number11
DOIs
Publication statusPublished - Nov 1 2017

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Substitution reactions
Cathodes
Sodium
Ions
Charge carriers
Oxidation-Reduction
Electrons
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Electrochemistry

Cite this

Improvement in the Energy Density of Na3V2(PO4)3 by Mg Substitution. / Inoishi, Atsushi; Yoshioka, Yuto; Zhao, Liwei; Kitajou, Ayuko; Okada, Shigeto.

In: ChemElectroChem, Vol. 4, No. 11, 01.11.2017, p. 2755-2759.

Research output: Contribution to journalArticle

Inoishi, Atsushi ; Yoshioka, Yuto ; Zhao, Liwei ; Kitajou, Ayuko ; Okada, Shigeto. / Improvement in the Energy Density of Na3V2(PO4)3 by Mg Substitution. In: ChemElectroChem. 2017 ; Vol. 4, No. 11. pp. 2755-2759.
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