Journal
JOURNAL OF POWER SOURCES
Volume 272, Issue -, Pages 90-99Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2014.08.043
Keywords
EDLC; High voltage capacitors; Coconut char carbon; Thermal stability; XPS
Funding
- State Scholarship Fund of China Scholarship Council [2011845511]
- Natural Science Foundation of Guangxi [2013GXNSFBA019230]
- Guangxi Education Department [201203YB087]
- Science Foundation of Guilin [20120112-3]
- Project for Doctor in Guilin University of Technology
- Center for Dielectric studies (CDS) at Pennsylvania State University
- NSF ASSIST program
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Symmetric EDLCs made using high purity carbon electrodes derived from coconut char were tested using 1 M Tetraethylammonium hexafluorophosphate dissolved in two different solvents namely acetonitrile and propylene carbonate. The cell voltage of the capacitor made using propylene carbonate can be extended to 3.5 V and it exhibited good cycling and thermal stability upto 70 degrees C while the voltage was limited to below 3.0 V in acetonitrile. XPS analysis of the positive and negative electrodes of EDLCs post cycling showed that the primary degradation products were related to ring opening reactions in propylene carbonate based electrolytes while water played a key role in degradation of acetonitrile based EDLCs. (C) 2014 Elsevier B.V. All rights reserved.
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