Extended Limits of Reversible Electrochemical Lithiation of Crystalline V 2 O 5

• Published in: ChemElectroChem Vol. 6; no. 7; pp. 2013 - 2019
• Main Authors: Itkis, Daniil M., Krivchenko, Victor A., Kozmenkova, Anna Ya, Pakhotina, Margarita S., Napolskiy, Filipp S., Gigli, Lara, Plaisier, Jasper, Khasanova, Nellie R., Antipov, Evgeny V.
• Format: Journal Article
• Language: English
• Published: 01.04.2019
• ISSN: 2196-0216; 2196-0216
• DOI: 10.1002/celc.201801638

Abstract Although lithium intercalation into vanadium (V) oxide was studied over decades, exact compositional stability limits for γ‐Li x V 2 O 5 phase, which can be reversibly lithiated and delithiated, are still not clear. Using operando and ex‐situ synchrotron X‐ray diffraction, we traced phase composition of the V 2 O 5 electrodes containing reduced graphene oxide during its lithiation and delithiation. We found that coating of micron‐sized V 2 O 5 particles by reduced graphene oxide yields the material providing electrochemical capacity of more than 300 mA h g −1 manifesting insertion of more than 2 lithium ions per mole of V 2 O 5 as confirmed by ICP MS analysis of the electrodes. The obtained electrode material can be sustainably cycled with capacity retaining at ca. 220 mA h g −1 at 500 mA g −1 current over 200 cycles.