Effect of electronic spatial extents (ESE) of ions on overpotentialof lithium ion capacitors

Title
Effect of electronic spatial extents (ESE) of ions on overpotentialof lithium ion capacitors
Authors
서범이충호구종민정철수
Keywords
ion conduction; capacitor; Electronic spatial extent; Overpotential; Nanopore; Potential drop
Issue Date
2014-01
Publisher
Electrochimica acta
Citation
VOL 115, 234-238
Abstract
The electronic spatial extent (ESE) of ions was defined as a major concept for assessing the cause of overpotential in the charging and discharging processes of a nanoporous activated carbon (AC) electrode. The performance degradation of AC/Li half-cells was caused by the overpotential, which was in discord with the electrolyte conductivity and ion size. Compared to the overpotential with the salt concentration, the AC/Li half-cell with a high concentration had a smaller overpotential, and its discharge patterns were similar to the curves obtained from the half-cells with a smaller ESE of BF4− ion. The ESE is a more realistic solution for determining the overpotential of the nanoporous capacitor, such as supercapacitor and Li ion capacitor, because its capacity is dependent on the electron density at the electric double layer of the capacitor electrode.
URI
http://pubs.kist.re.kr/handle/201004/46756
ISSN
00134686
Appears in Collections:
KIST Publication > Article
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