Article
  • Improvement of Thermal Stability of Polyethylene Lithium-ion Battery Separator via Coating with Polymers Synthesized from Bis-GMA Derivatives
  • Im H, Hong J, Kim CK
  • Bis-GMA 유도체로부터 제조된 고분자 코팅에 의한 리튬이차전지용 폴리에틸렌 격리막의 고온 안정성 향상
  • 임현구, 홍지혜, 김창근
Abstract
Microprous polyethylene (PE) membranes are widely used as lithium-ion battery separators. A separator having higher meltdown temperature than PE separator is still required for useful safety feature at a high temperature. To enhance meltdown temperature of PE separator, it was coated with polymers synthesized from bis-GMA derivatives by radical polymerization. Polymer was not formed when bis-GMA monomer having a high viscosity was used, while polymers were formed when bis-GMA derivatives having a low viscosity were used. When the separator was coated with polymer synthesized from reaction mixture containing proper amount of bis-GMA derivative, its meltdown temperature were increased up to 160 ℃ without reduction in the air permeability.

리튬이온 이차전지에는 폴리에틸렌 격리막이 주로 사용되어 오고 있다. 전지의 고온 안정성 확보를 위해서는 폴리에틸렌 격리막보다 높은 멜트다운(melt down) 온도를 갖는 격리막이 요구된다. 이를 위해 폴리에틸렌 격리막을 단량 체인 2,2-bis[4-(2-hydroxy-3-methacryloyloxypropoxy)phenyl]propane(bis-GMA) 혹은 이의 유도체들로 코팅하고 이를 라디칼 중합반응시켰다. 점도가 높은 bis-GMA를 사용한 경우에는 라디칼 중합반응이 진행되지 않은 반면 점도가 낮은 bis-GMA 유도체를 사용한 경우에는 라디칼 중합반응이 진행되었다. 적절한 함량의 bis-GMA 유도체를 포함한 반응액으로 격리막을 코팅하고 이를 중합반응시켜 격리막을 제조한 결과, 격리막의 통기도 감소없이 멜트다운 온도를 160 ℃까지 향상시킬 수 있었다.

Keywords: lithium-ion battery separator; bis-GMA derivatives; radical polymerization; coating; meltdown temperature

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2023 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 2010; 34(6): 517-521

    Published online Nov 25, 2010

  • Received on May 17, 2010
  • Accepted on Jun 29, 2010