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http://dx.doi.org/10.14579/MEMBRANE_JOURNAL.2014.24.1.10

Preparation of Porous Separators for Zn Air Batteries Through Phase Inversions of Polyethersulfone-PVP Solutions  

Cho, Yu Song (School of Energy.Materials and Chemical Engineering, Korea University of Technology and Education)
Koo, Ja-Kyung (School of Energy.Materials and Chemical Engineering, Korea University of Technology and Education)
Publication Information
Membrane Journal / v.24, no.1, 2014 , pp. 10-19 More about this Journal
Abstract
Porous flat sheet membranes for separators in Zn air batteries were prepared with polyethersulfone (PES) solutions by immersion precipitation phase inversion method. PES/polyvinylpyrrolidone(PVP)/N-methylpyrrolidone(NMP) mixtures were used for casting solutions and water was used for coagulant. With the separators, Zn air batteries were fabricated. The separators were characterized by means of stress-strain test, impedance test and SEM. The Zn air batteries were tested by current interrupt method (CIM) and galvanostatic discharge method. The tensile strength increased with increasing PES content in the casting solution while the ionic conductivity decreased. On the other hand, the ionic conductivity increased while the tensile strength decreased with increasing PVP content. The effect of ionic conductivity trend of the separator in the Zn air battery was confirmed through current interrupt method and galvanostatic discharge method experiments. The battery with the separator from casting solution with higher PES content showed higher IR drop and lower discharge capacity. And the battery with the separator from casting solution with higher PVP content showed lower IR drop and higher discharge capacity.
Keywords
phase inversion; separator; Zn air battery; IR drop; discharge capacity;
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Times Cited By KSCI : 1  (Citation Analysis)
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