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Preparation and Characterization of Sulfonated Poly (Arylene Ether Sulfone) Random Copolymer-Polyolefin Pore-filling Separators with Metal Ion Trap Capability for Li-ion Secondary Battery

리튬이온 이차전지용 금속이온 선택성 술폰화 폴리아릴렌에테르술폰 공중합체-폴리올레핀 함침격리막 제조 및 특성

  • Jeong, Yeon Tae (Future Technology Research Laboratory, Korea Electric Power Research Institute) ;
  • Ahn, Juhee (Dept. of Energy Eng., Dankook University) ;
  • Lee, Chang Hyun (Dept. of Energy Eng., Dankook University)
  • 정연태 (한전전력연구원 창의미래연구소) ;
  • 안주희 (단국대학교 융합기술대학 에너지공학과) ;
  • 이창현 (단국대학교 융합기술대학 에너지공학과)
  • Received : 2016.08.24
  • Accepted : 2016.08.29
  • Published : 2016.08.31

Abstract

Lithium ion secondary battery (LISB) is an energy conversion system operated via charging-discharging cycle based on Lithium ion migration. LISB has a lot of advantages such as high energy density, low self-discharge rate, and a relatively high lifetime. Recently, increasing demands of electric vehicles have been encouraging the development of LISB with high capacity. Unfortunately, it causes some critical safety issues. It includes dendrite formation on negative electrode, resulting in electric shortage problems and battery explosion. Also, the elevated temperatures occurred during the LISB operation induces thermal shrinkage of polyolefin (e.g., polyethylene and polypropylene) separators. Consequently, the low thermal stability leads to decay of LISB performances and the reduction of lifetime. In this study, sulfonated poly (arylene ether sulfone) (SPAES) random copolymers were used as key materials to prepare polyolefin pore-filling separator. The resulting separators were evaluated in the term of metal ion chelation capability associated with dendrite formation, $Li^+$ ion conductivity and thermal durability.

Acknowledgement

Supported by : 한국에너지기술평가원(KETEP)

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