Eldfellite-type cathode material, NaV(SO4)2, for Na-ion batteries

Akira Nishio, Yuji Ishado, Kosuke Nakamoto, Eiichi Kobayashi, Atsushi Inoishi, Hikari Sakaebe, Shigeto Okada

Research output: Contribution to journalArticlepeer-review

Abstract

In this research, an eldfellite-type material containing V as a transition metal, NaV(SO4)2, was investigated to achieve higher potentials and capacities through the use of a multi-redox pair. Average working potentials of 3.9 and 2.1 V vs. Na/Na+ were observed, and a large reversible capacity of 102 mA h g−1 was obtained over a wide potential range. Moreover, X-ray absorption near-edge structure and near-edge X-ray absorption fine structure measurements revealed that only V contributes to the charge compensation in the sodiation/desodiation process at low potentials, whereas both V and O contribute to the desodiation/sodiation process at high potentials. This phenomenon was also supported by the density of states and Bader charge analysis based on the DFT calculations.

Original languageEnglish
JournalMaterials Advances
DOIs
Publication statusAccepted/In press - 2022

All Science Journal Classification (ASJC) codes

  • Chemistry (miscellaneous)
  • Materials Science(all)

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