Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Preparation of Gel Polymer Electrolyte Membranes of Polyvinyl Alcohol and Poly (acrylic acid) for Zn Air Batteries

아연공기전지를 위한 Polyvinyl Alcohol과 Poly (acrylic acid)의 블랜드를 이용한 겔 고분자 전해질막의 제조

  • Kim, Chanhoon (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)
  • 김찬훈 (한국기술교육대학교 에너지.신소재.화학공학부) ;
  • 구자경 (한국기술교육대학교 에너지.신소재.화학공학부)
  • Received : 2012.06.15
  • Accepted : 2012.06.28
  • Published : 2012.06.29
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Abstract

Gel polymer electrolyte membranes were prepared from blends of polyvinyl alcohol (PVA) and poly (acrylic acid) (PAA), by solution-cast technique. The PAA content in the blend varied from 30 to 80 wt%. With the gel polymer electrolyte membranes, Zn air batteries were fabricated. The gel polymer electrolyte membranes were characterized by means of stress-strain test, impedance test. The Zn air batteries were tested by current interrupt method and galvanostatic discharge method. The tensile strength and tensile modulus decreased with increasing PAA content in the gel polymer electrolyte membrane. On the other hand, the ionic conductivity increased with increasing PAA content. The effect of ionic conductivity trend of the gel polymer electrolyte membrane in the Zn air battery was confirmed through current interrupt method and galvanostatic discharge method experiments. The battery with higher PAA content gel polymer electrolyte membrane showed lower IR drop and higher discharge capacity.

PVA와 PAA블랜드의 용액주조법을 통하여 겔 고분자 전해질막이 제조되었다. 블랜드 내의 PAA함량은 30에서 80 wt% 사이 범위에서 조절되었다. 겔 고분자 전해질을 이용하여 아연공기전지를 제작하였다. 제조된 겔 고분자 전해질의 기계적, 전기적 특성을 인장실험과 임피던스 실험을 통하여 측정하였다. 아연공기전지의 성능은 current interrupt method와 정전류 방전실험을 통하여 측정하였다. 겔 고분자 전해질 내의 PAA함량이 증가함에 따라 인장강도 및 인장탄성계수가 감소하였다. 반면, PAA함량의 증가에 따라 겔 고분자 전해질막의 이온전도도는 증가하였다. 이와 같은 이온전도도의 증가의 아연공기전지 내에서의 효과는 current interrupt method와 정전류 방전실험에서 확인되었다. PAA함량이 높은 겔 전해질막으로 제조된 전지는 낮은 IR손실과 높은 방전용량을 보였다.

Keywords

Acknowledgement

Supported by : 한국기술교육대학교

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