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http://dx.doi.org/10.14579/MEMBRANE_JOURNAL.2014.24.3.231

Preparation of Porous Separators for Zn Air Batteries through Phase Inversions of Polyetherimide-PVP Solutions  

Cho, Yu Song (School of Energy.Materials and Chemical Engineering, Korea University of Technology and Education)
Kim, Young Kyoung (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.3, 2014 , pp. 231-239 More about this Journal
Abstract
Polyetherimide (PEI) membranes for separators in Zn air batteries were prepared via phase inversion process from casting solution composed of PEI, n-methylpyrolidone (NMP), and polyvinylpurrolidone (PVP). Furthermore, Zn air batteries were fabricated with the separators. The effects of PEI content and PVP addition in the casting solution on the morphology, mechanical strength, ionic conductivity were investigated through SEM, stress-strain test and ac impedance test. The elelctrochemical performances of the batteries were evaluated through galvanostatic discharge analysis. The mechanical strength of the membrane increased with increasing PEI composition in the casting solution. Little effect of PVP addition into the solution on the mechanical strength of the membrane was investigated. The ionic conductivity value decreased with increasing PEI composition in the solution. With addition of PVP, ionic conductivity of membrane increased until 10 wt% to show the maximum value of 0.1 S/cm. In the higher range of PVP addition over 10%, the ionic conductivity decreased with increasing PVP addition. Ionic conductivity of separator strongly affected the capacity of Zn air battery, and the battery assembled with the separator which showed high ionic conductivity showed high capacity.
Keywords
phase inversion; separator; Zn air battery; IR drop; discharge capacity;
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Times Cited By KSCI : 4  (Citation Analysis)
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