A Highly Conductive and Thermally Stable Ionic Liquid Gel Electrolyte for Calcium-Ion Batteries

Saeid Biria, Shreyas Pathreeker, Francielli S. Genier, Ian D. Hosein

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


Calcium-ion batteries are promising alternatives for post-lithium-ion batteries. However, their progress remains limited by challenges associated with the development of stable and effective electrolytes. We report for the first time an ionic liquid polymer gel membrane as both the electrolyte and the separator for use in a calcium-ion battery operating at room temperature. The membrane is prepared via single-step photo-cross-linking of poly(ethylene glycol) diacrylate in the presence of calcium salt dissolved in an ionic liquid and shows room temperature ionic conductivities between 10-4and 10-3S/cm, ∼4 V stability vs Ca/Ca2+, a cationic transference number of 0.17, high thermal stability up to ∼300 °C, and full dissociation of the calcium salts in the ionic liquid. A prototype battery demonstrates intercalation-based room-temperature operation, delivering a promising initial discharge capacity of ∼140 mAh/g.

Original languageEnglish (US)
Pages (from-to)2111-2118
Number of pages8
JournalACS Applied Polymer Materials
Issue number6
StatePublished - Jun 12 2020
Externally publishedYes


  • calcium-ion batteries
  • electrolyte
  • energy storage
  • gel
  • ionic liquid
  • multivalent
  • separator

ASJC Scopus subject areas

  • Polymers and Plastics
  • Process Chemistry and Technology
  • Organic Chemistry


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