Exploring the Insertion Mechanisms of Metal Cations into V3O7·H2O

Daniela Söllinger, Jürgen Schoiber, Philipp L. Darge, Günther Redhammer, Simone Pokrant*

*Korrespondierende/r Autor/-in für diese Arbeit

Publikation: Beitrag in FachzeitschriftArtikelPeer-reviewed

Abstract

Understanding the insertion mechanisms of metal ions into electrode materials is essential to determining their applicability in future battery systems. Operando studies, i.e., investigating material property changes during ion insertion, are used to elucidate such mechanisms. In this work, we investigate the structural changes of V 3O 7·H 2O during Li +, Na +, and Zn 2+ insertion with operando X-ray diffraction and compare them to those observed with Mg 2+ insertion. In all cases, reversible crystal parameter changes occur, also referred to as unit cell breathing. However, as a function of the ion, different mechanisms are observed in response to the insertion. Na + uptake shows only solid-solution behavior, while Li + and Zn 2+ intercalation lead to solid-solution and two-phase insertion reactions. On comparing the structural changes as a function of capacity and/or the number of inserted ions, we find that the determining driving force for structural changes in V 3O 7·H 2O is not the ion species or the number of inserted ions but rather the oxidation state of the redox-active vanadium-ion centers. This work contributes to a deeper understanding of ion insertion mechanisms, emphasizing the importance of the oxidation state of the insertion material for structural changes during charge and discharge processes of electrode materials.

OriginalspracheEnglisch
Seiten (von - bis)2255-2265
Seitenumfang11
FachzeitschriftJournal of Physical Chemistry C
Jahrgang128
Ausgabenummer5
DOIs
PublikationsstatusVeröffentlicht - 2024

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© 2024 The Authors. Published by American Chemical Society.

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