Development of all-solid-state mediator-enhanced supercapacitors with polyvinylidene fluoride/lithium trifluoromethanesulfonate separators

Juanjuan Zhou, Jinshu Cai, Sirui Cai, Xiangyang Zhou, Azzam N. Mansour

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

All-solid-state supercapacitors (SCs) were fabricated using a polyvinylidene fluoride (PVDF)/lithium trifluoromethanesulfonate (LiTFS) membrane as the separator and poly(ethylene oxide) (PEO)/lithium perchlorate (LiClO4) as the polymer electrolyte in the porous carbon electrodes. Two types of mediators, NaI/I2 and K3Fe(CN) 6/K4Fe(CN)6, were added into the PEO/LiClO 4 polymer electrolyte that was used to fabricate the electrodes. The voltage window in which the SCs operated was 2.5-3 V. The results of electrochemical measurements, including cyclic voltammetry and galvanostatic charge/discharge, indicated that NaI/I2-containing and K 3Fe(CN)6/K4Fe(CN)6-containing SCs yielded high specific capacitances of 209.0 and 138.8 F g-1, respectively. In addition to high specific capacitances for the two mediator-containing SCs, both SCs delivered high specific energies (49.1 Wh kg-1 at 1.6 kW kg-1 for the NaI/I2-containing SC and 33.6 Wh kg-1 at 1.3 kW kg-1 for the K 3Fe(CN)6/K4Fe(CN)6-containing SC) due to the wide voltage window and fast redox reactions between mediators.

Original languageEnglish
Pages (from-to)10479-10483
Number of pages5
JournalJournal of Power Sources
Volume196
Issue number23
DOIs
StatePublished - Dec 1 2011

Fingerprint

lithium fluorides
electrochemical capacitors
vinylidene
separators
Separators
Lithium
solid state
Polyethylene oxides
Electrolytes
Polymers
Capacitance
capacitance
electrolytes
lithium perchlorates
Electrodes
electrodes
Redox reactions
polymers
Electric potential
electric potential

Keywords

  • Mediator
  • PVDF
  • Solid-state
  • Supercapacitor

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Physical and Theoretical Chemistry

Cite this

Development of all-solid-state mediator-enhanced supercapacitors with polyvinylidene fluoride/lithium trifluoromethanesulfonate separators. / Zhou, Juanjuan; Cai, Jinshu; Cai, Sirui; Zhou, Xiangyang; Mansour, Azzam N.

In: Journal of Power Sources, Vol. 196, No. 23, 01.12.2011, p. 10479-10483.

Research output: Contribution to journalArticle

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