Journal
JOURNAL OF POWER SOURCES
Volume 260, Issue -, Pages 19-26Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2014.02.098
Keywords
Electrochemical capacitors; Mesophase carbon microbeads; Non-porous activated soft carbon; Electrochemical activation; Quaternary alkyl ammonium
Funding
- National Natural Science Foundation of China [21173206]
- National Basic Research Program of China [2011CB935702]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars and State Education Ministry
- Hundred Talents Program of Chinese Academy of Sciences
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A 4 V asymmetric capacitor has been assembled using non-porous activated mesophase carbon microbeads (AMCMB) as the negative electrode, a graphitized carbon (GMCMB) as the positive electrode and quaternary alkyl ammonium based organic electrolyte. AMCMB has been heated under the reduction atmosphere of hydrogen/nitrogen after a chemical activation. It has small specific surface area (24.48 m(2) g(-1)), but delivers a large capacitance value due to the irreversible electrochemical activation in the initial galvanostatic charge discharge process. The storage charge behavior of AMCMB has also been investigated by ex situ XRD, Raman spectroscopy, cyclic voltammetry and electrochemical impedance spectroscopy. In terms of specific capacity, energy density, power density and cycle ability, the AMCMB/GMCMB capacitor is superior the other capacitors like AC/graphite, AC/AC. (C) 2014 Elsevier B.V. All rights reserved.
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