A novel mediator-containing polyvinylidene fluoride/lithium trifluoromethanesulfonate polymer electrolyte membrane for low-temperature solid-state supercapacitors

Jinshu Cai, Yuchen Wang, Xiaoyao Qiao, Xiangyang Zhou, Azzam N. Mansour

Research output: Contribution to journalArticle

Abstract

One of most difficult technical barriers for developing solid-state supercapacitors is low ionic conductivity of the polymer electrolyte at low temperature below the freezing point and at room temperature. In this work, a method which incorporates the addition of a small quantity of K 4 Fe(CN) 6 /K 3 Fe(CN) 6 mediators in the PVDF-LiTFS polymer electrolyte membrane was used to achieve high conductivity at −20 °C and 20 °C. When the concentration of the mediators was below 4 vol%, the ionic conductivity of the membrane was in the level of 10 −3 S/cm at −20 °C and 10 −2 S/cm at 20 °C and the electronic conductivity was less than 2 × 10 −6 S/cm at −20 °C and at 20 °C, suggesting that the polymer electrolyte can be used as a separator in a solid-state supercapacitor. The performance of the solid-state supercapacitor with mediator-containing membrane separator was better than that with mediator-free membrane separator at −20 °C.

Original languageEnglish (US)
Pages (from-to)26-29
Number of pages4
JournalMaterials Letters
Volume251
DOIs
StatePublished - Sep 15 2019

Keywords

  • Low-temperature
  • Mediator
  • Percolation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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