Prototype system of rocking-chair zn-ion battery adopting zinc chevrel phase anode and rhombohedral zinc hexacyanoferrate cathode

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Abstract

Zinc-ion batteries (ZIBs) have received attention as one type of multivalent-ion batteries due to their potential applications in large-scale energy storage systems. Here we report a prototype of rocking-chair ZIB system employing Zn2Mo6S8 (zinc Chevrel phase) as an anode operating at 0.35 V, and K0.02(H2O)0.22Zn2.94[Fe(CN)6]2 (rhombohedral zinc Prussian-blue analogue) as a cathode operating at 1.75 V (vs. Zn/Zn2+) in ZnSO4 aqueous electrolyte. This type of cell has a benefit due to its intrinsic zinc-dendrite-free nature. The cell is designed to be positive-limited with a capacity of 62.3 mAh g−1. The full-cell shows a reversible cycle with an average discharge cell voltage of ~1.40 V, demonstrating a successful rocking-chair zinc-ion battery system.

Original languageEnglish
Article number3
JournalBatteries
Volume5
Issue number1
DOIs
StatePublished - Mar 2019

Bibliographical note

Publisher Copyright:
© 2019 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

  • Chevrel phase
  • Multivalent-ion battery
  • Prussian blue analogue
  • Rocking-chair battery
  • Zinc hexacyanoferrate
  • Zinc-ion battery

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