Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of Gelling Agent Molecular Weight on Self-Discharge Behavior for Zinc-Air Batteries

아연-공기 전지용 전해질의 Gelling Agent 분자량에 따른 자가 방전 억제 효과

  • Park, Jeong Eun (Department of Advanced Material & Chemical Engineering, College of Engineering, Halla university) ;
  • Jo, Yong Nam (Department of Advanced Material & Chemical Engineering, College of Engineering, Halla university)
  • 박정은 (한라대학교 공과대학 신소재화학공학과) ;
  • 조용남 (한라대학교 공과대학 신소재화학공학과)
  • Received : 2019.11.08
  • Accepted : 2019.11.29
  • Published : 2019.12.27
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Abstract

A zinc-air battery is one of most promising advanced batteries due to its high specific energy density, low cost, and environmental friendliness. However, zinc anodes in zinc-air batteries lead to several issues including self-discharge, corrosion reaction, and hydrogen evolution reaction (HER). In this paper, viscosity of electrolyte has been controlled to suppress the corrosion reaction, HER, and self-discharge behavior. Various viscosity average molecular weights of poly(acrylic acid) (PAA) are adopted to prepare the electrolyte. The evaporation of electrolytes is proportional to the increase in molecular weight. In addition, enhanced self-discharge behavior is obtained when the gelling agent with high molecular weight is used. In addition, the zinc-air cell assembled with lower viscosity average molecular weight of PAA (Mv ~ 450,000) delivers 510.85 mAh/g and 489.30 mAh/g of discharge capacity without storage and with 6 hr storage, respectively. Also, highest capacity retention (95.78 %) is obtained among studied materials.

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References

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