Activating abnormal capacity in stoichiometric NaVO3 as cathode material for sodium-ion battery

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Detail(s)

Original languageEnglish
Pages (from-to)377-382
Journal / PublicationJournal of Power Sources
Volume400
Online published19 Aug 2018
Publication statusPublished - 1 Oct 2018

Abstract

Traditional sodium-ion battery cathodes utilize the change in oxidation state of the transition metal(s) in the structure to accommodate the electron transfer during charge and discharge. Recent researches on sodium-rich compounds such as Na2RuO3 and Na2IrO3 suggest that anionic reaction with oxygen can be an additional source of electrons during electrochemical reactions. Here we demonstrate for the first time that stoichiometric NaVO3, despite the valence of vanadium of 5+, delivers a reversible capacity by activating it beyond 4.5 V. Elemental analysis confirms Na removal and insertion from/into NaVO3 during charge/discharge. X-ray photoelectron spectroscopy and X-ray absorption near-edge spectroscopy results show that the oxidation state of vanadium remains unchanged, while oxygen is likely to compensate for the charge transfer during charge/discharge. Theoretical calculation on spin density of electrons in the lattice also supports the involvement of oxygen during sodium removal. Our demonstration of the unique behaviors of NaVO3 provides a new exciting direction for research in sodium-ion battery cathodes.

Research Area(s)

  • Cathode, Density functional theorem, NaVO3, Oxygen-redox reaction, Sodium-ion battery

Citation Format(s)

Activating abnormal capacity in stoichiometric NaVO3 as cathode material for sodium-ion battery. / Zhang, Jiaolong; Su, Bizhe; Kitajou, Ayuko; Fujita, Manabu; Cui, Yunlin; Oda, Mami; Zhou, Wenchong; Sit, Patrick H.-L.; Yu, Denis Y.W.

In: Journal of Power Sources, Vol. 400, 01.10.2018, p. 377-382.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review