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

Fingerprint

lithium fluorides
electrochemical capacitors
vinylidene
Lithium
Electrolytes
Polymers
separators
Separators
electrolytes
membranes
solid state
Membranes
polymers
Ionic conductivity
ion currents
conductivity
Temperature
Freezing
melting points
trifluoromethanesulfonic acid

Keywords

  • Low-temperature
  • Mediator
  • Percolation

ASJC Scopus subject areas

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

Cite this

A novel mediator-containing polyvinylidene fluoride/lithium trifluoromethanesulfonate polymer electrolyte membrane for low-temperature solid-state supercapacitors. / Cai, Jinshu; Wang, Yuchen; Qiao, Xiaoyao; Zhou, Xiangyang; Mansour, Azzam N.

In: Materials Letters, Vol. 251, 15.09.2019, p. 26-29.

Research output: Contribution to journalArticle

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AU - Zhou, Xiangyang

AU - Mansour, Azzam N.

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