Stable cycling of a Prussian blue-based Na/Zn hybrid battery in aqueous electrolyte with a wide electrochemical window

Rechargeable aqueous batteries have received widespread interest for large-scale energy storage because of their intrinsic advantages of safety, low cost and environmental friendliness. However, great challenges still remain for developing long-life batteries with aqueous electrolytes. In this work,...

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Bibliographic Details
Published in:New journal of chemistry 2020-03, Vol.44 (11), p.4639-4646
Main Authors: Liu, Chunli, Sun, Yunpo, Nie, Jianbo, Dong, Dong, Xie, Jian, Zhao, Xinbing
Format: Article
Language:English
Subjects:
Anode effect
Aqueous electrolytes
Cathodes
Cathodic dissolution
Cycles
Dissolution
Electrolytes
Electrolytic cells
Energy storage
Equivalent circuits
Mapping
Nyquist plots
Pigments
Polyamide resins
Rechargeable batteries
Separators
Sodium
Storage batteries
Zinc
Zinc coatings
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Summary:Rechargeable aqueous batteries have received widespread interest for large-scale energy storage because of their intrinsic advantages of safety, low cost and environmental friendliness. However, great challenges still remain for developing long-life batteries with aqueous electrolytes. In this work, an aqueous hybrid battery composed of a sodium iron hexacyanoferrate (FeHCF) cathode and a zinc anode has been proposed. The coating of polyamide on Zn is effective in regulating uniform Zn plating/stripping and suppressing Zn corrosion in the aqueous electrolyte. The electrochemical window of the electrolyte was extended to 3.3 V and the dissolution of the FeHCF cathode was obviously suppressed by adding 2 vol% vinylene carbonate to the 7 M NaCF 3 SO 3 /0.1 M Zn(CF 3 SO 3 ) 2 solution. As a result, the aqueous electrolyte delivers a relatively high specific capacity of 75 mA h g −1 at 1C (100 mA g −1 ) and exhibits a good cycling stability (60% capacity retention after 4000 cycles at 10C), showing promising applications in energy storage. An aqueous FeHCF/Zn cell with a protected Zn anode exhibits stable cycling in a wide-electrochemical-window electrolyte.
ISSN:1144-0546
1369-9261
DOI:10.1039/c9nj06024c