Issue 18, 2022

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

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 gāˆ’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.

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

Supplementary files

Article information

Article type
Paper
Submitted
11 Jan 2022
Accepted
29 Jun 2022
First published
30 Jun 2022
This article is Open Access
Creative Commons BY-NC license

Mater. Adv., 2022,3, 6993-7001

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

A. Nishio, Y. Ishado, K. Nakamoto, E. Kobayashi, A. Inoishi, H. Sakaebe and S. Okada, Mater. Adv., 2022, 3, 6993 DOI: 10.1039/D2MA00031H

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