New insights into the carbon/polymer electrolyte interface in the electric double layer capacitor

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

To use a polymer electrolyte successfully in the electric double-layer capacitor (EDLC), it is important to design the interface between the carbon electrode and the polymer electrolyte. In this work, interfacial properties of carbon/poly (ethylene oxide) (PEO) solid electrolyte and carbon (or activated carbon)/polymer gel electrolyte were investigated. The all-solid-state EDLC with a pair of isotropic high-density graphite (HDG) electrodes possesses a high capacitance in PEO/LiClO4 ([EO]/[Li+] = 8) solid polymer electrolyte. The capacitance of HDG electrode was strongly influenced by temperature and the degree of crystallinity of PEO-LiClO4. Furthermore, various gel electrolytes were evaluated. The PMMA (poly(methyl methacrylate)), PVdF (poly(vinylidene fluoride)) and PVdF-HFP (poly(vinylidene fluoride-hexafluoropropylene) based gel electrolytes show a good electrochemical stability on the HDG electrode and a sufficient mechanical strength. In the case of using activated carbon (AC) powder (as well as ordinary carbon powder) as the electrode material for EDLC with PVdF-HFP gel electrolyte, the electrode composed of AC (or carbon powder) and the gel electrolyte exhibits a higher specific capacitance and a lower ion diffusion resistance than does the electrode prepared with a dry polymer binder. The highest specific capacitance of 123 F g-1 was achieved with a composite electrode containing AC powder with a specific surface area of 2500 m2 g-1.

Original languageEnglish
Pages (from-to)422-427
Number of pages6
JournalElectrochemistry
Volume69
Issue number6
Publication statusPublished - 2001 Jun

Fingerprint

Electrolytes
Polymers
Carbon
Polyethylene oxides
Gels
Powders
Activated carbon
Graphite electrodes
Capacitance
Electrodes
Polymethyl Methacrylate
Supercapacitor
Solid electrolytes
Polymethyl methacrylates
Specific surface area
Strength of materials
Binders
Ions
Composite materials

Keywords

  • Carbon
  • Electric double layer capacitor
  • Interface
  • Polymer electrolyte

ASJC Scopus subject areas

  • Electrochemistry

Cite this

New insights into the carbon/polymer electrolyte interface in the electric double layer capacitor. / Liu, X.; Osaka, Tetsuya.

In: Electrochemistry, Vol. 69, No. 6, 06.2001, p. 422-427.

Research output: Contribution to journalArticle

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