Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Soluble Polyimide Binder for Silicon Electrodes in Lithium Secondary Batteries

리튬이차전지 실리콘 전극용 용해성 폴리이미드 바인더

  • Song, Danoh (Department of Chemical and Biological Eng., Hanbat National University) ;
  • Lee, Seung Hyun (Department of Organic Materials and Textile System Eng., Chungnam National University) ;
  • Kim, Kyuman (Department of Chemical and Biological Eng., Hanbat National University) ;
  • Ryou, Myung-Hyun (Department of Chemical and Biological Eng., Hanbat National University) ;
  • Park, Won Ho (Department of Organic Materials and Textile System Eng., Chungnam National University) ;
  • Lee, Yong Min (Department of Chemical and Biological Eng., Hanbat National University)
  • 송다노 (한밭대학교 화학생명공학과) ;
  • 이승현 (충남대학교 유기소재.섬유시스템공학과) ;
  • 김규만 (한밭대학교 화학생명공학과) ;
  • 유명현 (한밭대학교 화학생명공학과) ;
  • 박원호 (충남대학교 유기소재.섬유시스템공학과) ;
  • 이용민 (한밭대학교 화학생명공학과)
  • Received : 2015.09.01
  • Accepted : 2015.11.16
  • Published : 2015.12.10
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Abstract

A solvent-soluble polyimide (PI) polymeric binder was synthesized by a two-step reaction for silicon (Si) anodes for lithium-ion batteries. Polyamic acid was first prepared through ring opening between two monomers, bicyclo[2,2,2]oct-7-ene-2,3,5,6-tetracarboxylic dianhydride (BCDA) and 4,4-oxydianiline (ODA), followed by condensation reaction. Using the synthesized PI polymeric binder (molecular weight = ~10,945), the coating slurry was then prepared and Si anode was fabricated. For the control system, Si anode based on polyvinylidene fluoride (PVDF, molecular weight = ~350,000) having the same constituent ratio was prepared. During precycling, PI polymeric binder revealed much improved discharge capacity ($2,167mAh\;g^{-1}$) compared to that of using PVDF polymeric binder ($1,740mAh\;g^{-1}$), while the Coulombic efficiency of two systems were similar. PI polymeric binder improved the cycle retention ability during cycles compared to that of using PVDF, which is attributed to an improved adhesion property inside Si anode diminishing the dimensional stress during Si volume changes. The adhesion property of each polymeric binder in Si anode was confirmed by surface and interfacial cutting analysis system (SAICAS) (Si anode based on PI polymeric binder = $0.217kN\;m^{-1}$ and Si anode based on PVDF polymeric binder = $0.185kN\;m^{-1}$).

리튬이차전지 실리콘 전극에 활용하기 위해, 유기용매에 용해성이 있는 폴리이미드(Polyimide, PI) 고분자 바인더를 두 단계 반응을 이용해 합성하였다. 두 가지 단량체(Bicyclo[2,2,2]oct-7-ene-2,3,5,6-tetracarboxylic Dianhydride (BCDA)와 4,4-oxydianiline (ODA))의 개환 반응 및 축합 반응을 통해 PI 고분자 바인더를 합성하였다. 합성된 PI 고분자 바인더를 이용해 실리콘(silicon, Si) 음극 전극을 제조하였다. 또한 비교군으로써, Polyvinylidene Fluoride (PVDF)을 고분자 바인더로 사용하는 동일 조성을 가진 실리콘 전극을 제조하였다. PI 바인더를 사용한 Si 전극($2167mAh\;g^{-1}$)의 초기 쿨롱 효율은 기존 PVDF 바인더 조성의 Si 전극($1,740mAh\;g^{-1}$)과 유사했지만, 방전용량은 크게 개선되었다. 특히 수명 특성에서는 PI 바인더를 사용한 Si 전극이 우수한 특성을 나타내었는데, 이는 PI 바인더를 사용한 Si 전극접착력($0.217kN\;m^{-1}$)의 전극 접착력이 PVDF를 사용한 Si 전극($0.185kN\;m^{-1}$)보다 높아, 실리콘 부피팽창에 의한 전극 구조 열화가 적절히 제어되었기 때문이라고 판단된다. Si 전극 내의 접착력은 surface and interfacial cutting analysis system (SAICAS) 장비를 통해 검증하였다.

Keywords

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