Journal
KOREAN JOURNAL OF CHEMICAL ENGINEERING
Volume 36, Issue 11, Pages 1940-1947Publisher
KOREAN INSTITUTE CHEMICAL ENGINEERS
DOI: 10.1007/s11814-019-0388-6
Keywords
Electrochemical Double-layer Capacitor; Emulsified Binder; Styrene-butadiene Rubber; Polytetrafluoroethylene; Activated Carbon
Funding
- Ministry of Trade, Industry, and Energy (MOTIE), Korea [R0005989]
- Korea Technology & Information Promotion Agency for SMEs (TIPA) [R0005989] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The electrochemical properties of two water-emulsified polymers, styrene-butadiene rubber, and polytetrafluoroethylene, on activated carbon electrochemical capacitors were systematically compared. All electrodes were fabricated with different ratios of styrene-butadiene rubber and polytetrafluoroethylene: 4 : 0, 3 : 1, 2 : 2, and 1 : 3. A good dispersion of styrene-butadiene rubber nanoparticles maintains mesopores in activated carbon, whereas an increase in polytetrafluoroethylene binder content in the electrodes reduces mesoporous surface area significantly due to the lump polytetrafluoroethylene structure coagulated by smashed particles in water. The relatively strong adhesion of the styrene-butadiene rubber binder also leads to better cyclability for extremely long cycles and the rate capability with various current densities at room temperature. At a high temperature of 60 degrees C, however, the electrodes containing polytetrafluoroethylene binder showed comparable high specific capacitance due to the high thermal stability of polytetrafluoroethylene.
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