Journal
NANO ENERGY
Volume 60, Issue -, Pages 752-759Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2019.04.009
Keywords
Zinc-ion battery; V2O5 nanopaper; Cathode material; Solution-based exfoliation
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Funding
- National Science Foundation of China [51672098, 51632001]
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Aqueous batteries are suitable for large scale energy storage due to cost and safety concerns. Among all aqueous batteries, rechargeable aqueous zinc-ion battery is a promising choice because zinc electrode has low equilibrium potential, high exchange current density, and high hydrogen evolution overpotential. However, since zinc ion is a divalent cation, it is difficult to find a cathode material in which zinc ion can reversibly insert and extract. In this work, we introduce a novel V2O5 nanopaper consisting of V2O5 nanofibers and carbon nanotubes as reversible Zn-ion cathode. V2O5 has a layered crystalline structure. The spaces between the oxide layers may serve as 2-dimensional diffusion pathways for Zn ions. Meanwhile, the nanofiber morphology endows the material with short ionic diffusion distance and may tolerate high volume change. As a result, the V2O5 nanopaper cathode delivers a high capacity of 375 mAh g(-1) and long cycle life up to 500 cycles.
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