Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Electrochemical Characteristics of Polyurethane-based Polymer Electrolyte for Lithium Sulfur Battery

리튬 유황전지용 폴리우레탄 고분자 전해질의 전기화학적 특성

  • Kim, Hyeong-Ju (Department of Metallurgical and Materials Enginering, Advanced Materials Research Center, Engineering Research Institute Gyeongsang National University) ;
  • Shin, Joon-Ho (Department of Metallurgical and Materials Enginering, Advanced Materials Research Center, Engineering Research Institute Gyeongsang National University) ;
  • Kim, Jong-Hwa (Department of Metallurgical and Materials Enginering, Advanced Materials Research Center, Engineering Research Institute Gyeongsang National University) ;
  • Kim, Ki-Won (Department of Metallurgical and Materials Enginering, Advanced Materials Research Center, Engineering Research Institute Gyeongsang National University) ;
  • Ann, Hyo-Jun (Department of Metallurgical and Materials Enginering, Advanced Materials Research Center, Engineering Research Institute Gyeongsang National University) ;
  • Ahn, Ju-Hyun (Department of Chemical Engineering Gyeongsang National University)
  • Published : 2002.05.01
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Abstract

Polyurethane was used as matrix for polymer electrolytes with liquid electrolyte consist of organic solvent as ethylene carbonate(EC), propylene carbonate(PC), and tetraethylene glycol dimethylether(TG) and 1M $LiCF_3SO_3$, which has high mechanical strength and porosity. Electrochemical properties fur polyurethane electrolytes with various liquid electrolytes were evaluated. The amount of immersed liquid electrolyte for TG with 1M $LiCF_3SO_3$ was increased to about $750\%$ by weight, and initial discharge capacity and cycle performance was better than others. Ionic conductivity for TG/EC(v/v,1:1) and PC/EC(v/v, 1:1) with 1M $LiCF_3SO_3$ was about $3.15\times10^{-3} S/cm, \;3.18\times10^{-3}S/cm$

본 연구에서는 높은 인장강도와 탄성력을 가지는 다공성 폴리우레탄(polyurethane, PU)을 지지체(matrix)로 이용하고, 유기 전해액 ethylene carbonate(EC), propylene carbonate(PC), tetraethylene glycol dimethylether(TG)와 1M $LiCF_3SO_3$를 부피비 1:1 비율로 혼합하여 액체 전해액을 제조하였으며, 높은 이론용량을 가지는 Li/S전지에 적용하여 전기 화학적 특성을 조사하였다. 1M $LiCF_3SO_3$에 TG를 첨가할 경우 유기 전해액의 함침량이 약 $750\%$ 증가하였으며 방전용량$(1065mAh/g{\cdot}sulfur)$ 및 사이클 특성이 가장 우수하였다. 1M $LiCF_3SO_3$에 TG/EC(v/v,1:1) 및 PC/EC(v/v,1:1)를 첨가한 경우 이온 전도도는 각각 $3.15\times10^{-3}(S/cm)$ 와 $3.18\times10^{-3}(S/cm)$로 나타났다.

Keywords

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