Eldfellite-type cathode material, NaV(SO 4 ) 2 , for Na-ion batteries

In this research, an eldfellite-type material containing V as a transition metal, NaV(SO 4 ) 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...

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Bibliographic Details
Published inMaterials advances Vol. 3; no. 18; pp. 6993 - 7001
Main Authors Nishio, Akira, Ishado, Yuji, Nakamoto, Kosuke, Kobayashi, Eiichi, Inoishi, Atsushi, Sakaebe, Hikari, Okada, Shigeto
Format Journal Article
LanguageEnglish
Published 20.09.2022
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Summary:In this research, an eldfellite-type material containing V as a transition metal, NaV(SO 4 ) 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.
ISSN:2633-5409
2633-5409
DOI:10.1039/D2MA00031H