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Lithiation of V2O3 (SO4)2 ā€“ a flexible insertion host

DOI: 10.1039/D0TA06608G DOI Help

Authors: Stephanie F. Linnell (University of St Andrews) , Julia L. Payne (University of St Andrews) , David M. Pickup (University of Kent) , Alan V. Chadwick (University of Kent) , A. Robert Armstrong (University of St Andrews) , John T. S. Irvine (University of St Andrews)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Materials Chemistry A , VOL 104

State: Published (Approved)
Published: September 2020
Diamond Proposal Number(s): 14239

Open Access Open Access

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 gāˆ’1 to 313 mA h gāˆ’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.

Subject Areas: Materials, Chemistry

Instruments: B18-Core EXAFS