Abstract
Flow-permeable separators underwent surface modification, and their performances were evaluated to determine the impact of an ion-exchange coating on the electrochemical properties of sandwich diffusion batteries. A zinc–alkaline system was used to evaluate this performance at high discharge rates and diffusion overpotentials across the separator. An alkaline-resistant anion-exchange polyelectrolyte was synthesized based on a quaternary ammonia polysulfone system to utilize the coated separators for faster ion and counterion transport, and the obtained functionalized separators were compared with stationary inert porous separators. Accordingly, the discharge behavior of primary battery systems for both inactive and functionalized separators was introduced. According to discharge profiles, the practical voltage range, specific capacity, and utilization of active materials were improved, and ionic conduction was enhanced and verified by electrochemical impedance spectroscopy. Different commercial filter papers were examined to determine the optimal polymer–substrate compatibility.
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