High‐Performance Aqueous Rechargeable K/Zn Hybrid Batteries Based on Berlin Green Cathode Materials

: Aqueous rechargeable zinc‐based batteries with the advantages of sustainability, safety, and low cost, are suitable for large‐scale electrochemical energy storage applications. In this work, aqueous zinc‐based batteries with low defect Berlin green (FeHCF) cathode, a hybrid zinc triflate and potas...

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Bibliographic Details
Published in:ChemElectroChem 2022-01, Vol.9 (2), p.n/a
Main Authors: Ni, Gang, Hao, Zhao, Zou, Guo Yin, Cao, Fu Hu, Qin, Ling, Zhou, Cheng Gang
Format: Article
Language:English
Subjects:
Aqueous electrolytes
aqueous zinc-based battery
cathode material
Cathodes
Charge transfer
Diffusion rate
Electrochemical analysis
electrochemistry
Electrode materials
Electrolytes
energy conversion
Energy storage
Prussian blue analog
Rechargeable batteries
Solvation
Storage batteries
Zinc
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Summary:: Aqueous rechargeable zinc‐based batteries with the advantages of sustainability, safety, and low cost, are suitable for large‐scale electrochemical energy storage applications. In this work, aqueous zinc‐based batteries with low defect Berlin green (FeHCF) cathode, a hybrid zinc triflate and potassium triflate electrolyte, and zinc anodes are developed. In the hybrid electrolyte, the K+ ions with the weak solvation effect and small electrostatic interaction are the dominant intercalation species in the FeHCF, resulting in the fast charge transfer process and rapid diffusion kinetics. The Zn2+ ions stay at the surface rather than penetrate into the bulk phase. Thus, the hybrid batteries deliver a high specific capacity of 169.2 mAh g−1 at 100 mA g−1, excellent rate performance with 45.7 mAh g−1 at 6 A g−1, and good long‐term cyclability with a capacity retention of 57 % over 1000 cycles at 1 A g−1. The results suggest using aqueous K/Zn hybrid electrolytes can improve the electrochemical performance of FeHCF. An aqueous Zn‐based battery with a Berlin green cathode, a K/Zn hybrid electrolyte, and a zinc metal anode are developed. Owing to the rapid insertion and transportation of K ions in the cathode materials and the good compatibility of electrolytes to the metal anode, the hybrid battery delivers improved rate capability and cycle performance.
ISSN:2196-0216
2196-0216
DOI:10.1002/celc.202101351