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ZnZrF6-Based Electrolytes are Used in High-Stability Zinc-Ion Capacitors
Ling Wu1, Pingfan Zhou1, Peng Huang1
1Jiangsu Key Laboratory of Electrochemical Energy-Storage Technologies, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, China.
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This research proposes a low-cost and efficient interfacial regulation strategy by introducing ZnZrF6 as an electrolyte additive in a ZnSO4 system to enhance aqueous zinc-ion capacitor performance. During cycling, Zr4+participates in interfacial reactions on the Zn anode, forming a stable composite SEI layer rich in ZnF2, which promotes uniform Zn2+ deposition and suppresses dendrite growth. Meanwhile, F- reduces side reactions, inhibiting corrosion and hydrogen evolution, thus improving stability. The Zn symmetric cell operates stably over 2700 h, while Zn||Cu cells maintain over 99.9% coulombic efficiency. The assembled capacitors exhibit excellent cycling stability over 50 000 cycles, demonstrating high performance and practical potential.
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