Article

2020; 20(3): 419-424

Published online January 8, 2020 https://doi.org/10.1016/j.cap.2020.01.004

Copyright © The Korean Physical Society.

Sensible design of open-porous spherical architectures for hybrid supercapacitors with improved high-rate capability

Lee B.-G., Shin S.-I., Ha M.-W., An G.H.

R&D Center, EUROCELL, Gajangsaneopseo-ro, Osan-si, Gyeonggi-do, South Korea; Department of Electrical Engineering, Myongji University, Yongin-si, Gyeonggi-do, South Korea; Department of Energy Engineering, Gyeongnam National University of Science and Technology, Jinju, South Korea; Future Convergence Technology Research Institute, Gyeongnam National University of Science and Technology, Jinju, South Korea

Correspondence to:Ha, Min-Woo
Department of Energy Engineering, Gyeongnam National University of Science and Technology

Received: November 4, 2019; Accepted: January 5, 2020

Abstract

Hybrid supercapacitors show high energy densities with good long-term cycling stability when used as energy sources. However, their poor rate performance as a consequence of their low ionic diffusion capability at high currents during cycling should be improved. Here, we propose using a spray-drying process to fabricate a novel structure comprising open-porous spherical lithium manganese oxide as an electrode material for hybrid supercapacitors. The resultant hybrid supercapacitor comprising full-cell systems shows a high specific capacitance (33.8 F cm−3 at a current of 1 A) and remarkable high-rate performance (25.6 F cm−3 at a current of 16 A). Moreover, outstanding cycling stability of 83% was attained at a current of 2 A after 5400 cycles. Our new strategy provides a useful methodology to increase the abundance of electrochemically active sites by fabricating a spherical structure using nanosized primary particles, which also leads to shorter diffusion pathways and to improved ionic electron transport because of the open-porous structure of the electrode materials. © 2020

Keywords: High-rate capability, Hybrid supercapacitor, Lithium manganese oxide, Open-porous structure, Spherical structure

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