A porous puckered V2O5 polymorph as new high performance cathode material for aqueous rechargeable zinc batteries
Batyrbekuly D. Laïk B. Pereira-Ramos J.-P. Bakenov Z. Baddour-Hadjean R.
October 2021Elsevier B.V.
Journal of Energy Chemistry
2021#61459 - 468 pp.
Aqueous rechargeable zinc batteries are getting increasing attention for large-scale energy storage owing to their advantages in terms of cost, environmental friendliness and safety. Here, the layered puckered γ′-V2O5 polymorph with a porous morphology is firstly introduced as cathode for an aqueous zinc battery system in a binary Zn2+/Li+ electrolyte. The Zn|| γ′-V2O5 cell delivers high capacities of 240 and 190 mAh g−1 at current densities of 29 and 147 mA g−1, respectively, and remarkable cycling stability in the 1.6 V–0.7 V voltage window (97% retention after 100 cycles at 0.15 A g−1). The detailed structural evolution during first discharge-charge and subsequent cycling is investigated using X-ray diffraction and Raman spectroscopy. We demonstrate a reaction mechanism based on a selective Li insertion in the 1.6 V–1.0 V voltage range. It involves a reversible exchange of 0.8 Li+ in γ′-V2O5 and the same structural response as the one reported in lithiated organic electrolyte. However, in the extended 1.6 V–0.7 V voltage range, this work puts forward a concomitant and gradual phase transformation from γ′-V2O5 to zinc pyrovanadate Zn3V2O7(OH)2.2H2O (ZVO) during cycling. Such mechanism involving the in-situ formation of ZVO, known as an efficient Zn and Li intercalation material, explains the high electrochemical performance here reported for the Zn|| γ′-V2O5 cell. This work highlights the peculiar layered-puckered γ′-V2O5 polymorph outperforms the conventional α-V2O5 with a huge improvement of capacity of 240 mAh g−1 vs 80 mAh g−1 in the same electrolyte and voltage window.
Aqueous zinc battery , Cathode , Energy storage , High performance , Layered structure , Renewable energy , Vanadium pentoxide , γ′-V2O5
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Institut de Chimie et des Matériaux Paris Est (ICMPE), UMR 7182 CNRS et Université Paris Est Créteil, 2 rue Henri Dunant, Thiais, 94320, France
School of Engineering, National Laboratory Astana, Nazarbayev University, 53 Kabanbay Batyr Avenue, Astana, 010000, Kazakhstan
Institut de Chimie et des Matériaux Paris Est (ICMPE)
School of Engineering
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