Water‐Lubricated Intercalation in V2O5·nH2O for High‐Capacity and High‐Rate Aqueous Rechargeable Zinc Batteries. Issue 1 (13th November 2017)

• Record Type: Journal Article
• Authors: Yan, Mengyu; He, Pan; Chen, Ying; Wang, Shanyu; Wei, Qiulong; Zhao, Kangning; Xu, Xu; An, Qinyou; Shuang, Yi; Shao, Yuyan; Mueller, Karl T.; Mai, Liqiang; Liu, Jun; Yang, Jihui
• Is Part Of: Advanced materials. Volume 30:Issue 1(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-11-13
• Subjects: energy storage -- rate capability -- structural water -- zinc batteries; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.201703725
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: 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 H2 O on Zn 2+ intercalation into bilayer V2 O5 ·nH2 O is demonstrated. The results suggest that the H2 O‐solvated Zn 2+ possesses largely reduced effective charge and thus reduced electrostatic interactions with the V2 O5 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. Abstract : The co‐intercalation of H2 O and Zn 2+ as well as the "lubricating effect" of water in V2 O5 · n H2 O 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.