Abstract
Gel polymer electrolytes consisted of polyvinylpyrrolidone (PVP) and PVP–polyvinylacetate (PVP–PVAc) as base polymers, (C 2H 5) 4NBF 4 as an electrolyte salt and propylene carbonate (PC) as a plasticizer. The electric conductance of the gel polymer electrolytes, the capacitance and charge–discharge current efficiency of test capacitors with these electrolytes and activated carbon fiber were measured. The conductivity of the gel polymer electrolytes was measured in the range between −20 and +60°C, and was around 10 −3 S cm −1 at 25°C. The discharge capacitance of one of the electrode of model capacitors with PVP–PVAc-based polymer was 0.74 F cm −2 (38 F g −1), and cycling current efficiency was over 90%.
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