ZnZrF 6 ‐Based Electrolytes are Used in High‐Stability Zinc‐Ion Capacitors
Ling Wu, Pingfan Zhou, Peng Huang, Yuxue Deng, Hongfang Ma, Huixin Qu, Zhenming Xu, Laifa Shen, Xiaogang Zhang, Hao TongABSTRACT
This research proposes a low‐cost and efficient interfacial regulation strategy by introducing ZnZrF 6 as an electrolyte additive in a ZnSO 4 system to enhance aqueous zinc‐ion capacitor performance. During cycling, Zr 4+ participates in interfacial reactions on the Zn anode, forming a stable composite SEI layer rich in ZnF 2 , which promotes uniform Zn 2+ 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.