4.5 Article

Designing a Zn(BF4)2-Based Ionic Liquid Electrolyte to Realize Superior Energy Density in a Carbon-Based Zinc-Ion Hybrid Capacitor


Volume 8, Issue 7, Pages 1289-1297


DOI: 10.1002/celc.202100003


ionic liquid; carbon-based zinc-ion hybrid capacitors; energy density; metallic Zn interfaces; mechanism


  1. National Nature Science Foundations of China [21965019]
  2. China Postdoctoral Science Foundation [2017 M613248]
  3. Natural Science Foundation of Gansu Province [1506RJZA091]
  4. Scientific Research Foundation of the Higher Education Institutions of Gansu Province [2015 A-037]

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This study demonstrates the use of a novel electrolyte to construct C-ZIHCs with high energy density, ensuring stability and long cycle life during charging/discharging processes.
Carbon-based zinc-ion hybrid capacitors (C-ZIHCs), inheriting the merits from supercapacitors and batteries, exhibit promise in energy-storage technologies. However, unsatisfactory energy density still hinders their practical applications for most reported C-ZIHCs. We report a novel Zn(BF4)(2)/[EMIM]BF4 electrolyte to construct C-ZIHCs with a high energy density. The Zn(BF4)(2)/[EMIM]BF4 electrolyte features high reductive/oxidative stability, which guarantees no significant dendrites and side reactions to corrode the Zn anode during the charging/discharging process, and achieves ultrafast Zn plating/stripping with a high coulombic efficiency (>99 %) and unprecedented cycling stability (over 1200 h). By virtue of the excellent properties of the electrolyte, C-ZIHCs is built to exhibit a high average output voltage (1.9 V), a high energy/power density (220 Wh kg(-1)/9.5 KW kg(-1)), and a long cycle life (95 % capacity retention after 20000 cycles). Herein, we report the use of Zn salt-based ionic liquid as an electrolyte to construct C-ZIHCs, which provides a new opportunity for the development of C-ZIHCs with excellent comprehensive performance.


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