Degradation Mechanisms of Electric Double Layer Capacitors with Activated Carbon Electrodes on High Voltage Exposure

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  • 活性炭電極を用いた電気二重層キャパシタの高電圧作動下における劣化機構
  • カッセイタン デンキョク オ モチイタ デンキ ニジュウソウ キャパシタ ノ コウデンアツ サドウ カ ニ オケル レッカ キコウ

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Abstract

Degradation mechanism of electrochemical double layer capacitors on high-voltage exposure is examined. Capacitance loss for positive electrodes is significantly accelerated above 4.5 V (vs. Li/Li+) whereas that of negative electrodes occurs on the electrochemical cycles down to 1.2 V. The surface of positive electrodes is covered with decomposition products of propylene carbonate used as electrolyte solution, and therefore high-voltage exposure increases impedance of electrodes. In contrast, the degradation of negative electrodes is triggered by the decomposition reaction of electrolyte salts, resulting in the formation of radical species. It is proposed that the radical species attack fluorinated polymer used as a binder, leading to the defluorination of binders and thus increase in polarization on electrochemical cycles.

Journal

  • Electrochemistry

    Electrochemistry 83 (8), 609-618, 2015

    The Electrochemical Society of Japan

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