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


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 = $0.185kN\;m^{-1}$).


Supported by : National Research Foundation of Korea


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