4 years ago

Water-Lubricated Intercalation in V2O5·nH2O for High-Capacity and High-Rate Aqueous Rechargeable Zinc Batteries

Water-Lubricated Intercalation in V2O5·nH2O for High-Capacity and High-Rate Aqueous Rechargeable Zinc Batteries
Jihui Yang, Pan He, Yi Shuang, Kangning Zhao, Jun Liu, Karl T. Mueller, Yuyan Shao, Xu Xu, Shanyu Wang, Mengyu Yan, Qiulong Wei, Ying Chen, Qinyou An, Liqiang Mai
Low-cost, environment-friendly aqueous Zn batteries have great potential for large-scale energy storage, but the intercalation of zinc ions in the cathode materials is challenging and complex. Herein, the critical role of structural H2O on Zn2+ intercalation into bilayer V2O5·nH2O is demonstrated. The results suggest that the H2O-solvated Zn2+ possesses largely reduced effective charge and thus reduced electrostatic interactions with the V2O5 framework, effectively promoting its diffusion. Benefited from the “lubricating” effect, the aqueous Zn battery shows a specific energy of ≈144 Wh kg−1 at 0.3 A g−1. Meanwhile, it can maintain an energy density of 90 Wh kg−1 at a high power density of 6.4 kW kg−1 (based on the cathode and 200% Zn anode), making it a promising candidate for high-performance, low-cost, safe, and environment-friendly energy-storage devices. The co-intercalation of H2O and Zn2+ as well as the “lubricating effect” of water in V2O5·nH2O is demonstrated, which enhances the rate capability and energy density of zinc batteries. A combination of an ultrahigh power density of 6.4 kW kg−1 and a high energy density of 144 Wh kg−1 is achieved in aqueous rechargeable zinc batteries.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adma.201703725

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