Which risk increases with prolonged operation of an electrochemical capacitor using ionic liquid electrolyte beyond rated voltage?

💡 Explanation

When an electrochemical capacitor with ionic liquid electrolyte operates beyond its rated voltage, Faradaic reactions occur due to electrolyte oxidation/reduction, leading to electrolyte decomposition and gas buildup because electrochemical stability is exceeded. Therefore electrolyte decomposition results, rather than enhanced capacitance or decreased ESR, which require different mechanisms, or improved power density, which is not related.

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