Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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The Conductivity Properties of Poly(ethylene oxide) Polymer Electrolyte as a Function of Temperature, Kinds of Lithium Salt and Plasticizer Addition

Poly(ethylene oxide) 고분자 전해질의 온도, Li 염의 종류 및 가소제 첨가에 따른 전도도 특성

  • Kim, J.U. (Dept. of Electrical Eng., Chonnam National University) ;
  • Jin, B.S. (Battery Technology Team, Korea Electrotechnology Research Institute) ;
  • Moon, S.I. (Battery Technology Team, Korea Electrotechnology Research Institute) ;
  • Gu, H.B. (Dept. of Electrical Eng., Chonnam National University) ;
  • Yun, M.S. (Battery Technology Team, Korea Electrotechnology Research Institute)
  • 김종욱 (전남대학교 전기공학과) ;
  • 진봉수 (한국전기연구소 전기재료연구부 전지기술연구팀) ;
  • 문성인 (한국전기연구소 전기재료연구부 전지기술연구팀) ;
  • 구할본 (전남대학교 전기공학과) ;
  • 윤문수 (한국전기연구소 전기재료연구부 전지기술연구팀)
  • Published : 1994.07.21
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Abstract

The purpose of this study is to research and develop solid polymer electrolyte(SPE) for Li secondary battery. This paper describes the effects of lithium salts, plasticizer addition and temperature dependence of conductivity of PEO electrolytes. Polyethylene oxide(PEO) based polymer electrolyte films were prepared by solution casting an acetonitrile solution of preweighed PEO and Li salt. After solvent evaporation, the electrolyte films were vacuum-dried at $60^{\circ}C$ for 48h, the thickness of the films were $90{\sim}110{\mu}m$. The conductivity properties of prepared PEO electrolytes are summarized as follows. PEO electrolyte complexed with $LiClO_4$ shows the better conductivity of the others. $PEO-LiClO_4$ electrolyte when $EO/Li^+$ ratio is 8, showed the best conductivity. Optimum operating temperature of PEO electrolyte is $60^{\circ}C$. By adding propylene carbonate and ethylene carbonate to $PEO-LiClO_4$ electrolyte, its conductivity was higher than $PEO-LiClO_4$ without those. Also $PEO_8LiClO_4$ electrolyte remains static up to 4.5V vs. $Li/Li^+$.

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