Lithium ion capacitors fabricated with polyethylene oxide-functionalized polysilsesquioxane hybrid ionogel electrolytes

Wonjun Na, Albert S. Lee, Jin Hong Lee, Seung Sang Hwang, Soon Man Hong, Eunkyoung Kim, Chong Min Koo

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

We present a new polyethylene glycol-functionalized polysilsesquioxane, a ladder-like structured poly(poly(ethylene oxide)-co-methacryloxypropyl)silsesquioxane) (PEO-SQ) hybrid-type polymer gelator to fabricate hybrid ionogel electrolytes for lithium ion capacitors. The organic-inorganic hybrid polymer gelator contains not only an inorganic ladder-like polysilsesquioxane backbone for the thermal and electrochemical stability, but also dual organic pendant groups consisting of free-dangling PEO chains and unsaturated methacryloxypropyl groups for enhanced lithium ion dissociation and thermal curing function, respectively. The successful crosslinking of 1 M LiTFSI in N-butyl-N-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide (BMPTFSI) ionic liquid with only a small amount of PEO-SQ hybrid crosslinker (5 wt%) gave non-leaking ionogels with high thermal stability (∼400°C), large ionic conductivities, and excellent lithium ion capacitor C-rate performance and cyclability, comparable to those of neat ionic liquid electrolyte and superior over conventional organic ionogels fabricated with organic crosslinkers without PEO-moeities.

Original languageEnglish
Pages (from-to)582-588
Number of pages7
JournalElectrochimica Acta
Volume188
DOIs
Publication statusPublished - 2016 Jan 10
Externally publishedYes

Keywords

  • electrolyte
  • ionogel
  • Lithium ion capacitor
  • polysilsesquioxane

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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