Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Characteristics of Lithium Metal Secondary Battery Using PAN Gel-electrolyte Mixed with TiO2 Ceramic Filler

TiO2 Ceramic Filler가 혼합된 젤상의 PAN 고분자 전해질을 이용한 리튬금속 이차전지의 특성

  • Lim, Hyo-Sung (Dept. of Chemical Eng., Yonsei University) ;
  • Kim, Hyung-Sun (Eco & Nano Research Center, Korea Institute of Science and Technology) ;
  • Cho, Byung-Won (Eco & Nano Research Center, Korea Institute of Science and Technology) ;
  • Lee, Tae-Hee (Dept. of Chemical Eng., Yonsei University)
  • 임효성 (연세대학교 화학공학과) ;
  • 김형선 (한국과학기술연구원 나노 환경연구센터) ;
  • 조병원 (한국과학기술연구원 나노 환경연구센터) ;
  • 이태희 (연세대학교 화학공학과)
  • Published : 2002.08.01
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Abstract

Gel-type polyacrylonitrile(PAN) polymer electrolytes have been prepared using ethylene carbonate(EC), propylene carbonate(PC) and dimethyl carbonate(DMC) plasticizer, $LiPF_6$ salt and $TiO_2$ ceramic filler. Electrochemical properties, such as electrochemical stability, ionic conductivity and compatibility with lithium metal and mechanical properly of polymer electrolytes were investigated. Charge/discharge performance of lithium secondary battery using these polymer electrolytes were investigated. The maximum load that the polymer electrolyte resists increased about two times as a result of adding $TiO_2$ in the polymer electrolyte containing EC and PC. Polymer electrolyte containing EC, PC and $TiO_2$ also showed ionic conductivity of $2\times10^{-3} S/cm$ at room temperature and electrochemical stability window up to 와 4.5V. Polymer electrolyte containing EC, PC, and $TiO_2$ showed the most stable interfacial resistance of $130\Omega$ during 20 days in the impedance spectra of the cells which were constructed by lithium metals as electrodes. Lithium metal secondary battery which employed $LiCoO_2$ cathode, lithium metal anode and $TiO_2$-dispersed polymer electrolyte showed $90\%$ of charge/discharge efficiency at the 1C rate of discharge.

Ethylene carbonate(EC), propylene carbonate(PC), dimethyl carbonate(DMC)의 가소제와 $LiPF_6$ 리튬염 및 $TiO_2$ 충진제를 이용하여 젤형 polyacrylonitrile(PAN) 전해질을 제조하였다. 고분자 전해질의 전기화학적 안정성, 이온전도도, 리튬전극과의 호환성 등의 전기화학적 특성과 기계적 특성을 조사하였다. 이러한 고분자 전해질을 이용하여 조립된 리튬이차전지의 충방전 특성을 조사하였다 EC, PC 혼합 가소제를 이용하여 제조된 고분자 전해질은 $TiO_2$가 첨가됨에 따라 고분자 전해질이 견딜 수 있는 최대 하중이 2배 가깝게 증가하였다. EC, PC혼합 가소제와 $TiO_2$가 혼합된 고분자 전해질은 상온에서 $2\times10^{-3}S/cm$의 이온전도도를 나타내었고, 4.5V까지 전기화학적으로 안정하였다. 리튬금속을 사용하여 제조된 셀의 임피던스 결과에서도 EC, PC 혼합 가소제와 $TiO_2$가 혼합된 고분자 전해질이 20일 동안 계면 저항 $130\Omega$으로 가장 안정하였다. $LiCoO_2$ 양극과 리튬 음극, $TiO_2$가 혼합된 고분자 전해질로 구성된 전지는 충방전효율이 1C 방전속도에서 $90\%$를 나타내었다.

Keywords

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