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Incorporation of conductive polymer into soft carbon electrodes for lithium ion capacitors

Authors
Lim, Young-GeunPark, Min-SikKim, Ki JaeJung, Kyu-SungKim, Jung HoShahabuddin, MohammedByun, DongjinYu, Ji-Sang
Issue Date
20-12월-2015
Publisher
ELSEVIER SCIENCE BV
Keywords
Lithium ion capacitor; Negative electrode; Soft carbon; Conductive polymer
Citation
JOURNAL OF POWER SOURCES, v.299, pp.49 - 56
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF POWER SOURCES
Volume
299
Start Page
49
End Page
56
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/91553
DOI
10.1016/j.jpowsour.2015.08.083
ISSN
0378-7753
Abstract
The positive effects of incorporating electrically conductive poly(3,4-ethylenedioxythiophene)-poly-styrene sulfonate (PEDOT-PSS) into the negative electrode (NE) of a lithium ion capacitor (LIC) is investigated. The binding material of the NE, styrene-butadiene rubber (SBR), is partially substituted by conductive PEDOT-PSS. The soft carbon NE with 1.0 wt% PEDOT-PSS exhibits enhanced capacity retention of 64% at a current density of 5 C by lowering its electrical and electrochemical charge transfer resistance. The rate capability increased with increasing amounts of PEDOT-PSS, with no variation in the Li+ diffusivity. This improved electrochemical performance of the NE is also reflected in the LIC full-cell configuration. An LIC employing a 1.0 wt% PEDOT-PSS NE delivers 6.6 F at a high current density of 100 C, which is higher than the 6.0 F measured for the LIC with a bare NE. Moreover, the LIC with the 1.0 wt% PEDOT-PSS NE retains 85% of its initial capacitance even after 5000 cycles. These results are mainly attributed to the favourable electrical network formed by the incorporation of PEDOT-PSS into the NE. Thus, we believe that the incorporation of conductive PEDOT-PSS is a viable approach for obtaining high-power LICs. (C) 2015 Elsevier B.V. All rights reserved.
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공과대학 (신소재공학부)
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