Journal
JOURNAL OF POWER SOURCES
Volume 196, Issue 6, Pages 3114-3118Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2010.11.157
Keywords
Supercapacitor; Electrode mass; Degradation; Non-aqueous electrolyte; Activated carbon
Funding
- Swiss National Science Foundation (SNSF) [200021-117607]
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The accelerated degradation of carbon based supercapacitors utilizing 1 M Et4NBF4 in acetonitrile and in propylene carbonate as electrolyte is investigated for a constant cell voltage of 3.5 V as a function of the positive over total electrode mass ratio. The degradation rate of the supercapacitor using acetonitrile as a solvent can be decreased by increasing the mass of the positive electrode. With a mass ratio (positive electrode mass/total electrode mass) of 0.65 the degradation rate is minimum. For the capacitor utilizing propylene carbonate as a solvent a similar effect was observed. The degradation rate was smallest for a mass ratio above 0.5. (C) 2010 Elsevier B.V. All rights reserved.
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