脱フッ素化法を用いたキャパシタ電極用カーボン材料

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  • A carbon electrode prepared by defluorination for use in an electrochemical capacitor
  • ダツフッソカホウ オ モチイタ キャパシタ デンキョクヨウ カーボン ザイリョウ

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In this review, the author outlines the electrochemical capacitance properties of carbon materials prepared by the defluorination of fluorocarbon materials, such as polytetrafluoroethylene (PTFE), fluorinated hetero-organics, or graphite fluoride with alkali metals or alkali cation-naphthalene anion radical complexes. The surface area and pore size distribution of the PTFE-based porous carbons prepared through the defluorination technique without any conventional activation can be controlled by optimizing the defluorination conditions. These PTFE-based nanoporous carbons show an better rate performance of the capacitance than do conventional activated carbons due to their developed mesoporous structure which suppresses the ion-sieving effect and accelerates ion adsorption/desorption in the pores even when the electrolyte ion is bulky. Fluorinated hetro-organics can be defluorinated as well as PTFE to provide nitrogen- or boron-doped nanoporous carbons. A lamellar-like carbon material with low specific surface area and a large interlayer spacing, obtained by the defluorination of graphite fluoride, shows a high capacitance that depends on polarization voltage. In conclusion, the defluorination technique produces carbon materials suitable for capacitors, leading to new type of porous carbon electrode.

収録刊行物

  • 炭素

    炭素 2016 (273), 75-82, 2016

    炭素材料学会

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