Effects of supporting electrolyte on the storage capacity of hybrid capacitors using graphitic and activated carbon

Yuji Yokoyama, Nobuaki Shimosaka, Hiroshige Matsumoto, Masaki Yoshio, Tatsumi Ishihara

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Abstract

Effects of anions and cations in the supporting electrolyte on the storage capacity of a hybrid capacitor were studied, and it was found that the large discharge capacity of 95 mAh/g was achieved by using triethylmethylammonium PF6 (TEMAPF6) as a supporting electrolyte. Storage mechanisms of positive and negative electrodes were also analyzed by using in situ X-ray diffraction measurement. The large capacity can be attributed to the electrochemical intercalation of PF 6- into graphite. It was found that the stability of the anion for positive electrodes and ionic size of the cation for negative electrodes are important for supporting salt in order to achieve larger capacities.

Original languageEnglish
Pages (from-to)A72-A75
JournalElectrochemical and Solid-State Letters
Volume11
Issue number5
DOIs
Publication statusPublished - Mar 24 2008

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All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Electrochemistry
  • Electrical and Electronic Engineering

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