Abstract
Solid electrolytes which comprise lithium and magnesium triflate ionic salts in polyacrylonitrile (PAN)-based gels are used to fabricate electrochemical double-layer capacitors in conjunction with ethylene carbonate (EC) and propylene carbonate (PC) as plasticizers and high-density graphite (HDG) as polarizable electrodes. The conductivity of the solid electrolytes is around 10 −3 S cm −1 at ambient temperatures. Composites which consist of PAN+EC+PC+electrolyte are electrochemically stable over a wide potential range. Cells of the type: HDG/PAN–EC–PC–Li and Mg-triflate/HDG exhibit single-electrode discharge capacitance values of 480 and 383 μF cm −2, respectively, with attractive charge–discharge characteristics.
Published Version
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