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Title: Water‐Lubricated Intercalation in V 2 O 5 ·nH 2 O for High‐Capacity and High‐Rate Aqueous Rechargeable Zinc Batteries

Journal Article · · Advanced Materials
 [1];  [2];  [3];  [4];  [2];  [2];  [2];  [2];  [2];  [3];  [3];  [2];  [3];  [4]
  1. Materials Science and Engineering Department University of Washington Seattle WA 98195‐2120 USA, State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China
  2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China
  3. Pacific Northwest National Laboratory Richland WA 99352 USA
  4. Materials Science and Engineering Department University of Washington Seattle WA 98195‐2120 USA

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 H 2 O on Zn 2+ intercalation into bilayer V 2 O 5 ·nH 2 O is demonstrated. The results suggest that the H 2 O‐solvated Zn 2+ possesses largely reduced effective charge and thus reduced electrostatic interactions with the V 2 O 5 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.

Sponsoring Organization:
USDOE
OSTI ID:
1408543
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Vol. 30 Journal Issue: 1; ISSN 0935-9648
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English
Citation Metrics:
Cited by: 908 works
Citation information provided by
Web of Science

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