Journal
CHEMELECTROCHEM
Volume 2, Issue 1, Pages 150-159Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.201402302
Keywords
aging; electrochemistry; double-layer capacitors; lifetime testing; supercapacitor
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Funding
- Bavarian State Ministry of the Environment and Consumer Protection
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Commercial 50F double-layer capacitors from leading international manufactures were tested with respect to fire protection regulations and general safety hazards in technical pulse-power applications at temperatures of up to 120 degrees C and voltages up to 4V. Diagnostic criteria were gathered during a decade of lifetime testing concerning the destruction of the electrode materials and the evaporation of electrolyte. The aging behavior of supercapacitors is quantified on the basis of capacitance loss, parasitic side reactions, and the chemical analysis of decomposition products. Amines, amides, and oligomers of acetonitrile are formed in the electrolyte. The carbon composite electrodes are destroyed by continual stress at high temperatures and operating voltages.
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