An amphiphilic block-graft copolymer electrolyte: Synthesis, nanostructure, and use in solid-state flexible supercapacitors

Jung Yup Lim, Jin Kyu Kim, Jung Min Lee, Du Yeol Ryu, Jong Hak Kim

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

We report a highly ionic conductive amphiphilic nanostructured polymer electrolyte with good flexibility for solid-state flexible supercapacitors. It is based on a block-graft copolymer, i.e., poly(styrene-b-butadiene-b-styrene)-g-poly(oxyethylene methacrylate) (SBS-g-POEM) synthesized via one-pot free-radical polymerization. The SBS-g-POEM comprises hydrophobic SBS main chains and hydrophilic POEM side chains, providing mechanical strength and ion conducting properties, respectively. Preferential interactions of POEM with a salt and the morphological evolution of SBS-g-POEM electrolytes were demonstrated. A well-defined microphase-separated structure with good interconnectivity at the nanoscale was observed. This is responsible for the high ionic conductivity of the electrolyte together with the dimensional stability. A detailed structure-property relationship was investigated by changing the ratio of SBS to POEM, the concentration of each component, the chain length of POEM, and the operating temperature. Furthermore, solid-state flexible supercapacitors were fabricated using carbon-based electrodes on carbon paper substrates. The performance of supercapacitors based on the SBS-g-POEM electrolyte was much higher than that of the widely used conventional PVA/H3PO4 electrolyte.

Original languageEnglish
Pages (from-to)7848-7858
Number of pages11
JournalJournal of Materials Chemistry A
Volume4
Issue number20
DOIs
Publication statusPublished - 2016

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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