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

Fan Xu, Chung Ho Lee, Chong Min Koo, Cheolsoo Jung

Research output: Contribution to journalArticle

18 Citations (Scopus)

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 BF 4- 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.

Original languageEnglish
Pages (from-to)234-238
Number of pages5
JournalElectrochimica Acta
Volume115
DOIs
Publication statusPublished - 2014 Jan 1
Externally publishedYes

Fingerprint

Lithium
Capacitors
Activated carbon
Ions
Electrodes
Electrolytes
Carrier concentration
Salts
Degradation

Keywords

  • Capacitor
  • Electronic spatial extent
  • Nanopore
  • Overpotential
  • Potential drop

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

Cite this

Effect of electronic spatial extents (ESE) of ions on overpotential of lithium ion capacitors. / Xu, Fan; Lee, Chung Ho; Koo, Chong Min; Jung, Cheolsoo.

In: Electrochimica Acta, Vol. 115, 01.01.2014, p. 234-238.

Research output: Contribution to journalArticle

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