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Received July 2, 2019
Accepted September 10, 2019
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Effect of emulsified polymer binders on the performance of activated carbon electrochemical double-layer capacitors
School of Chemical Engineering, University of Ulsan, 93 Daehak-ro, Nam-gu, Ulsan 44610, Korea 1Solution Advanced Technology Co. Ltd., Siheung-si, Gyeonggi-do, Korea 2Ulsan Technopark, 15 Jongga-ro, Jung-gu, Ulsan 44412, Korea
esoh1@ulsan.ac.kr
Korean Journal of Chemical Engineering, November 2019, 36(11), 1940-1947(8), 10.1007/s11814-019-0388-6
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Abstract
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 oC, however, the electrodes containing polytetrafluoroethylene binder showed comparable high specific capacitance due to the high thermal stability of polytetrafluoroethylene.
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References
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