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 journalArticlepeer-review

23 Citations (Scopus)


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
Publication statusPublished - 2014
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported by the Fundamental R&D Program for Core Technology of Materials, the Ministry of Knowledge Economy, Republic of Korea and partially by Korea Institute of Science and Technology .


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

ASJC Scopus subject areas

  • General Chemical Engineering
  • Electrochemistry


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