Article
  • Effects of Molecular Weight of Polyvinylidene Fluoride Binder on Electrochemical Performances of Organic Electric Double-Layer Capacitors
  • Jihoon Yoo#,*, Inchan Yang#,*, Myung-Soo Kim*, and Ji Chul Jung*,**,†

  • *Department of Chemical Engineering, Myoungji University, Yongin 17058, Korea

    **Organic-Inorganic Hybrid Process Research Center, Myongji University, Yongin 17058, Korea

  • 플루오르화 폴리비닐리덴 바인더의 분자량이 유기계 전기이중층 커패시터의 전기화학적 특성에 미치는 영향
  • 유지훈#,* · 양인찬#,* · 김명수* · 정지철*,**,†

  • *명지대학교 화학공학과, **명지대학교 유무기 하이브리드 공정연구소

Abstract

Herein, we assembled electric double-layer capacitor (EDLCs) electrodes with polyvinylidene fluoride (PVDF) as the binder. The effect of the molecular weight of PVDF on the electrochemical properties of the EDLCs were investigated by various characterization tools. The EDLCs assembled using PVDF with low molecular weight showed relatively good capacitance compared to those assembled using PVDF with high molecular weight owing to their low resistance. However, in long-term durability experiments, EDLCs assembled using PVDF with high molecular weights showed higher durability than EDLCs assembled using PVDF with low molecular weights. To investigate the underlying reasons, field emission-scanning electron microscopy (FE-SEM) was applied. Although all prepared EDLC electrodes showed tightly packed morphologies before charge–discharge process was conducted, morphologies of electrodes using low molecular weight PVDF were gradually loosed as charge–discharge process was conducted. As a result, an appropriate binder molecular weight is required to prepare EDLC with high performances.


본 논문에서는 바인더가 유기계 전기이중층 커패시터(EDLCs)의 전기화학적 성질에 미치는 영향을 조사하기 위하여 플루오르화 폴리비닐리덴(polyvinylidene fluoride, PVDF) 바인더의 분자량을 다르게 하여 EDLC를 조립한 후 다양한 전기화학적 특성 분석을 실시하였다. 특성 분석 결과, 낮은 분자량의 PVDF를 사용하여 조립된 EDLC는 높은 분자량의 PVDF를 사용하여 조립된 EDLC보다 낮은 저항 및 높은 용량 특성을 나타냈으나 충-방전이 진행되는 동안 활물질과 도전재 사이의 구조가 높은 분자량의 PVDF를 사용하여 조립된 EDLC에 비해 느슨해져 결과적으로 낮은 수명을 나타내었다. 따라서 높은 성능을 갖는 EDLC를 제조하기 위해서는 적절한 바인더 분자량이 요구된다


Keywords: electric double-layer capacitor, binder, molecular weight, rate capability, cycle stability

  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2018 Impact Factor : 0.500
  • Indexed in SCIE

This Article

  • 2019; 43(6): 838-845

    Published online Nov 25, 2019

  • 10.7317/pk.2019.43.6.838
  • Received on Jun 10, 2019
  • Revised on Aug 12, 2019
  • Accepted on Aug 23, 2019

Correspondence to

  • Ji Chul Jung
  • *Department of Chemical Engineering, Myoungji University, Yongin 17058, Korea

    **Organic-Inorganic Hybrid Process Research Center, Myongji University, Yongin 17058, Korea

  • E-mail: jcjung@mju.ac.kr