Scientific Reports (Apr 2021)

Monocarborane cluster as a stable fluorine-free calcium battery electrolyte

  • Kazuaki Kisu,
  • Sangryun Kim,
  • Takara Shinohara,
  • Kun Zhao,
  • Andreas Züttel,
  • Shin-ichi Orimo

DOI
https://doi.org/10.1038/s41598-021-86938-0
Journal volume & issue
Vol. 11, no. 1
pp. 1 – 8

Abstract

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Abstract High-energy-density and low-cost calcium (Ca) batteries have been proposed as ‘beyond-Li-ion’ electrochemical energy storage devices. However, they have seen limited progress due to challenges associated with developing electrolytes showing reductive/oxidative stabilities and high ionic conductivities. This paper describes a calcium monocarborane cluster salt in a mixed solvent as a Ca-battery electrolyte with high anodic stability (up to 4 V vs. Ca2+/Ca), high ionic conductivity (4 mS cm−1), and high Coulombic efficiency for Ca plating/stripping at room temperature. The developed electrolyte is a promising candidate for use in room-temperature rechargeable Ca batteries.