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Lithiation of V2O3(SO4)2 - a flexible insertion host

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Author(s)

Stephanie F. Linnell, Julia L. Payne, David M. Pickup, Alan V. Chadwick, A. Robert Armstrong, John T. S. Irvine

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Abstract

Materials that display strong capabilities for lithium insertion without significant change in unit cell size on cycling are of considerable importance for electrochemical applications. Here, we present V2O3(SO4)2 as a host for lithium-ion batteries. Electrochemically, 2.0 Li+ ions can be inserted, giving Li2V2O3(SO4)2 with an oxidation state of V4+, as determined by X-ray absorption spectroscopy. The capacity of V2O3(SO4)2 can be increased from 157 mA h g−1 to 313 mA h g−1 with the insertion of two additional Li+ ions which would drastically improve the energy density of this material, but this would be over a wider potential range. Chemical lithiation using n-butyllithium was performed and characterisation using a range of techniques showed that a composition of Li4V2O3(SO4)2 can be obtained with an oxidation state of V3+. Structural studies of the lithiated materials by X-ray diffraction showed that up to 4.0 Li+ ions can be inserted into V2O3(SO4)2 whilst maintaining its framework structure.
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Original languageEnglish
Pages (from-to)19502-19512
Number of pages11
JournalJournal of Materials Chemistry A
Volume8
Issue number37
Early online date10 Sep 2020
DOIs
Publication statusPublished - 7 Oct 2020

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