npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Article

Research Paper

New Phys.: Sae Mulli 2020; 70: 745-751

Published online September 29, 2020 https://doi.org/10.3938/NPSM.70.745

Copyright © New Physics: Sae Mulli.

Study on the Manufacturing Characteristics of high Capacity Supercapacitor Using Graphene Electrodes

ByungJun PARK*, SeonMi YOO, TaeMoo NO, YoungHee LEE, YoungHee HAN

New and Renewable Energy laboratory, KEPCO Research Institute, Daejeon 34056, Korea

Correspondence to:bjpark@kepco.co.kr

Received: July 1, 2020; Revised: July 28, 2020; Accepted: July 28, 2020

Abstract

The use of supercapacitors in a battery system could be a solution to eliminate the need for short-term frequent replacement of batteries and to reduce size, resources and maintenance fees during frequency regulation (F/R) of a power grid. Furthermore, the electrochemical properties of graphene are different from those of commercial active carbon and still need additional verification in order to be applied to large-scale electrodes. In this study, we used spray-dry processed 3D crumpled graphene in order to improve energy density, which is directly connected to both the performance and the inhibition of electrode active-material restacking. We evaluated the charge/discharge electro chemical performance of graphene electrodes under various process conditions for the purpose of designing a proper electrode composition and electrolyte. As a result, the power density of graphene electrodes could be maintained between 17 kW/kg and 26 kW/kg by decreasing the binder content from 10 wt% to 5 wt%. In addition, the electrical capacity per volume was increased to 500% by using a 2-roll press, and the power density was confirmed to have been improved by more than 370% when SBPBF4 was used instead of TEABF4. Finally, we suggest an efficient process for the manufacture of large-scale electrodes. This process will allow entire of the capacitance and the electrochemical stability of a graphene supercapacitor.

Keywords: ESS, Supercapacitor, Graphene, Capacitance, Electrode

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