Solid polymer electrolytes consisting of complexes of poly(ethylene oxide)‐grafted poly(methyl)‐methacrylate (PEO‐PMMA) and tetraalkylammonium salts [tetrabutylammonium perchlorate, tetraethylammonium perchlorate, and tetraethylammonium tetrafluoroborate (TEABF 4 )] have been investigated for electric double‐layer capacitors with activated carbon fiber cloth electrodes. The PEO‐PMMA and tetraalkylammonium composites obtained showed high ionic conductivity (>10 −4 S cm −1 at 298 K). The ionic conductivity depended on both the concentration and the size of each ion. The composites had good stability over a wide potential range ( ca. 5.0 V). When the PEO‐PMMA and TEABF 4 composites were used in solid‐state electric double‐layer capacitors with activated carbon fiber cloths as polarizable electrodes, the capacitors showed charge/discharge behavior with large values of capacitance and high coulombic efficiency. The long voltage retention was observed in the self‐discharge test of the capacitor with TEABF 4 .
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Ishikawa et al. (1994) studied this question.