Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Preparation of Poly(propylene) Membrane Supported Gel Electrolyte Membranes for Rechargeable Lithium Ion Batteries through Thermal Polymerization of Di(ethylene glycol) Dimethacrylate

Di(ethylene glycol) Dimethacrylate의 열중합에 의한 Poly(propylene) 분리막으로 지지한 리튬이온 이차전지의 겔 전해질막 제조

  • Yun, Mi-Hye (Department of Applied Chemical Engineering, Korea University of Technology and Education) ;
  • Kwon, So-Young (Department of Applied Chemical Engineering, Korea University of Technology and Education) ;
  • Jung, Yoo-Young (Department of Applied Chemical Engineering, Korea University of Technology and Education) ;
  • Cho, Doo-Hyun (Department of Applied Chemical Engineering, Korea University of Technology and Education) ;
  • Koo, Ja-Kyung (Department of Applied Chemical Engineering, Korea University of Technology and Education)
  • 윤미혜 (한국기술교육대학교 응용화학공학과) ;
  • 권소영 (한국기술교육대학교 응용화학공학과) ;
  • 정유영 (한국기술교육대학교 응용화학공학과) ;
  • 조두현 (한국기술교육대학교 응용화학공학과) ;
  • 구자경 (한국기술교육대학교 응용화학공학과)
  • Received : 2010.07.26
  • Accepted : 2010.09.25
  • Published : 2010.09.30
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Abstract

Porous poly(propylene) supported gel polymer electrolytes (GPE) were synthesized by thermal polymerization of DEGDMA [Di(ethylene glycol) dimethacrylate] in electrolyte solutions (1 M solution of $LiPF_6$ in EC/DEC 1 : 1 mixture) at $70^{\circ}C$. AC impedance spectroscopy and cyclic voltammetry were used to evaluate its ionic conductivity and electrochemical stability window of the GPE membranes. Lithium ion battery (LIB) cells were also fabricated with $LiNi_{0.8}Co_{0.2}O_2$/graphite and GPE membranes via thermal polymerization process. Through the thermal polymerization, self sustaining GPE membranes with sufficient ionic conductivities (over $10^{-3}\;S/cm$) and electrochemical stabilities. The LIB cell with 5% monomer showed the best rate-capability and cycleability.

다공성 Poly(propylene) 분리막의 지지 하에 전해질 용액 (EC/DEC 1 : 1 혼합물 내의 $LiPF_6$ 1 M 용액) 내에서 DEGDMA [Di(ethylene glycol) dimethacrylate]의 $70^{\circ}C$ 열중합을 통하여 겔 고분자 전해질(GPE)막이 합성 되었다. 합성된 겔 고분자 전해질막의 이온전도도 및 전기화학적 안정성은 AC 임피던스법 및 CV (cyclic voltametry)법에 의하여 측정 평가하였다. 겔 고분자를 전해질로, 그리고 양극 및 음극으로는 각각 $LiMi_{0.8}Co_{0.2}O_2$ 및 graphite로 이용하여 리튬이온전지(LIB)도 제작하였다. 열중합을 통하여 리튬 이온전지에 적합한 이온전도도($10^{-3}\;S/cm$ 이상) 및 전기화학적 안정성을 보이면서 자체적인 성상을 유지하는 겔 고분자 전해질막을 얻을 수 있었다. 단량체 함량 5%의 전구체로 제작한 겔 고분자 전지는 단량체 함량이 7.0% 및 10.0%인 경우에 비하여 우수한 고율 및 충-방전 효율을 보였다.

Keywords

Acknowledgement

Supported by : 한국기술교육대학교

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