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Electric and Mechanical Properties of CMC+PTFE Binary Binder Electrode for Electric Double Layer Capacitor

EDLC용 CMC+PTFE 혼합바인더 전극의 전기적, 기계적 특성

  • 김익준 (한국전기연구원 전지연구그룹) ;
  • 이선영 (한국전기연구원 전지연구그룹) ;
  • 문성인 (한국전기연구원 전지연구그룹)
  • Published : 2004.10.01

Abstract

This work describes the effect of electrode binder on the characteristics of electric double layer capacitor. Among carboxymethylcellulose (CMC), Polyvinylpyrrolidone (PVP), Polyvinyl Alcohol (PVA), and Polyvinylidene Fluoride (PVDF), the unit cell using CMC showed good rate capability at current densities between 2.5 mA/$\textrm{cm}^2$~100 mA/$\textrm{cm}^2$. However, CMC as a binder is incongruent, because the electrode bound with CMC is rigid and easy to crack during a press and winding process for fabrication of capacitor. The unit cell capacitor using the electrode bound with binary binder composed of CMC and Polytetrafluoroethylene (PTFE), especially in composition CMC : PTFE =60 : 40 wt.%, has exhibited the better mechanical properties than those of the unit cell with CMC. On the other hand, the mechanical properties of CMC+PTFE electrode, coated on underlayer composed of CMC and carbon black, were much improved.

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