Journal
JOURNAL OF ENERGY CHEMISTRY
Volume 38, Issue -, Pages 20-25Publisher
ELSEVIER
DOI: 10.1016/j.jechem.2018.12.023
Keywords
Aqueous zinc-ion batteries; Vanadium oxide; Insertion reaction; Phase transition
Funding
- Tianjin Natural Science Foundation [18JCZDJC31100]
- MOST [2017YFA0206700, 2016YFA0202503]
- MOE [B12015]
- Fundamental Research Funds for the Central Universities
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Rechargeable aqueous zinc-ion batteries are recently gaining incremental attention because of low cost and material abundance, but their development is plagued by limited choice of cathode materials with satisfactory cycling performance. Here, we report a porous V2O5 nanofibers cathode with high Zn-storage performance in an aqueous Zn(CF3SO3)(2) electrolyte. We propose a reaction mechanism based on phase transition from orthorhombic V2O5 to zinc pyrovanadate on first discharging and reversible Zn2+ (de)intercalation in the open-structured hosts during subsequent cycling. This open and stable architecture enables a high reversible capacity of 319 mAh g(-1) at 20 mA g(-1) and a capacity retention of 81% over 500 cycles. The remarkable electrochemical performance makes V2O5 a promising cathode for aqueous zinc-ion batteries. (C) 2019 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.
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