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

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 gā1 to 313 mA h gā1 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
Documents:
d0ta06608g.pdf