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Issue 14, 2020
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Ultrafast cation insertion-selected zinc hexacyanoferrate for 1.9 V K–Zn hybrid aqueous batteries

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Abstract

The low energy/power density of aqueous rechargeable batteries (ARBs) have limited their further development and application because of their voltage limitation of 1.23 V. Herein, K–Zn hybrid ARBs with a high discharge voltage of 1.937 V are reported for the first time. The selective ionic insertion/extraction mechanism into/from the zinc hexacyanoferrate (ZnHCF) cathode in the hybrid electrolyte was clearly revealed by in situ X-ray diffraction. The cathode material displays an outstanding rate capability of 300C and a high capacity of 78.7 mA h g−1. The constructed K–Zn hybrid ARBs exhibit an energy density of 67 W h kg−1, a high power density of 4.76 kW kg−1 and excellent rate performance with 67.6% capacity retention from 2C to 60C. These excellent performances contribute to the selected K+ insertion mechanism. These exciting results can offer an alternative path for the development of hybrid aqueous batteries for stable and high energy/power density energy storage techniques.

Graphical abstract: Ultrafast cation insertion-selected zinc hexacyanoferrate for 1.9 V K–Zn hybrid aqueous batteries

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Article information


Submitted
10 Dec 2019
Accepted
12 Feb 2020
First published
25 Mar 2020

J. Mater. Chem. A, 2020,8, 6631-6637
Article type
Paper

Ultrafast cation insertion-selected zinc hexacyanoferrate for 1.9 V K–Zn hybrid aqueous batteries

M. Huang, J. Meng, Z. Huang, X. Wang and L. Mai, J. Mater. Chem. A, 2020, 8, 6631
DOI: 10.1039/C9TA13497B

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