Abstract: Different anhydrous potassium ion conducting polymer electrolytes have been studied: (POE)$-n$/KTFSI (trifluorosulfonimide), plasticized (POE)$-n$/KTFSI, (PEM)$-n$/KTFSI, and (POE-Acetal)$-n$/KTFSI. DSC and conductivity measurements have been used to characterize these electrolytes. Several solutions to avoid crystallization have been examined. The best conductivity has been obtained with (POE-Acetal)$-n$/KTFSI. This electrolyte exhibits good transmission in the VIS-IR region. The response time of cells using these electrolytes and Prussian blue and K$-x$/WO$-3$/ as electrodes has been measured and compared. !18
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