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High and rapid alkali cation storage in ultramicroporous carbonaceous materials

Cited 32 time in Web of Science Cited 34 time in Scopus
Authors
Yun, Young Soo; Lee, Seulbee; Kim, Na Rae; Kang, Minjee; Leal, Cecilia; Park, Kyu-Young; Kang, Kisuk; Jin, Hyoung-Joon
Issue Date
2016-05
Citation
Journal of Power Sources, Vol.313, pp.142-151
Keywords
UltramicroporeActivated carbonSupercapacitorElectrodeEnergy storage
Abstract
To achieve better supercapacitor performance, efforts have focused on increasing the specific surface area of electrode materials to obtain higher energy and power density. The control of pores in these materials is one of the most effective ways to increase the surface area. However, when the size of pores decreases to a sub-nanometer regime, it becomes difficult to apply the conventional parallel-plate capacitor model because the charge separation distance (d-value) of the electrical double layer has a similar length scale. In this study, ultramicroporous carbonaceous materials (UCMs) containing sub-nanometer-scale pores are fabricated using a simple in situ carbonization/activation of cellulose-based compounds containing potassium. The results show that alkali cations act as charge carriers in the ultramicropores (<0.7 nm), and these materials can deliver high capacitances of similar to 300 F g(-1) at 0.5 A g(-1) and 130 F g(-1), even at a high current rate of 65 A g(-1) in an aqueous medium. In addition, the UCM-based symmetric supercapacitors are stable over 10,000 cycles and have a high energy and power densities of 8.4 Wh kg(-1) and 15,000 W kg(-1), respectively. This study provides a better understanding of the effects of ultramicropores in alkali cation storage.
ISSN
0378-7753
URI
http://hdl.handle.net/10371/165051
DOI
https://doi.org/10.1016/j.jpowsour.2016.02.068
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
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