Lithiation of V2O3(SO4)2 - a flexible insertion host
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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.
Linnell , S F , Payne , J L , Pickup , D M , Chadwick , A V , Armstrong , A R & Irvine , J T S 2020 , ' Lithiation of V 2 O 3 (SO 4 ) 2 - a flexible insertion host ' , Journal of Materials Chemistry A , vol. 8 , no. 37 , pp. 19502-19512 . https://doi.org/10.1039/D0TA06608G
Journal of Materials Chemistry A
Copyright © 2020 The Author(s). Open Access Article. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
DescriptionThe authors also thank EPSRC for funding of SFL's PhD thesis (EP/N509759/1).
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