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Electrolyte Additive-Assembled Interconnecting Molecules-Zinc Anode Interface for Zinc-Ion Hybrid Supercapacitors

delete2025-05-21
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OA
AI
Y
Yang Li
X
Xu Li
X
Xinya Peng
X
Xinyu Yang
康飞宇 cover
康飞宇 (Feiyu Kang) *
DOI：10.1007/s40820-025-01794-1delete
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Abstract

Abstract

En 中文
Zinc-ion hybrid supercapacitors (ZHSs) are promising energy storage systems integrating high energy density and high-power density, whereas they are plagued by the poor electrochemical stability and inferior kinetics of zinc anodes. Herein, we report an electrolyte additive-assembled interconnecting molecules-zinc anode interface, realizing highly stable and fast-kinetics zinc anodes for ZHSs. The sulfobutyl groups-grafted beta-cyclodextrin (SC) supramolecules as a trace additive in ZnSO4 electrolytes not only adsorb on zinc anodes but also self-assemble into an interconnecting molecule interface benefiting from the mutual attraction between the electron-rich sulfobutyl group and the electron-poor cavity of the adjacent SC supramolecule. The interconnecting molecules-zinc anode interface provides abundant anion-trapping cavities and zincophilic groups to enhance Zn2+ transference number and homogenize Zn2+ deposition sites, and meanwhile, it accelerates the desolvation of hydrated Zn2+ to improve zinc deposition kinetics and inhibit active water molecules from inducing parasitic reactions at the zinc deposition interface, making zinc anodes present superior reversibility with 99.7% Coulombic efficiency, similar to 30 times increase in operation lifetime and an outstanding cumulative capacity at large current densities. ZHSs with 20,000-cycle life and optimized rate capability are thereby achieved. This work provides an inspiring strategy for designing zinc anode interfaces to promote the development of ZHSs.
Keywords:
Zinc-ion hybrid supercapacitor
Zinc anode
Electrolyte additive
Cycling stability
Electrochemical kinetics

Journal

Nano-Micro Letters cover
Nano-Micro Letters
IF:
36.3
Papers:
2.6K
Citations:
3.6W

Organization

No organization information available