Conjugated polymer energy level shifts in lithium-ion battery electrolytes

Charles Kiseok Song, Brian J. Eckstein, Teck Lip Dexter Tam, Lynn Trahey*, Tobin Jay Marks

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

The ionization potentials (IPs) and electron affinities (EAs) of widely used conjugated polymers are evaluated by cyclic voltammetry (CV) in conventional electrochemical and lithium-ion battery media, and also by ultraviolet photoelectron spectroscopy (UPS) in vacuo. By comparing the data obtained in the different systems, it is found that the IPs of the conjugated polymer films determined by conventional CV (IPC) can be correlated with UPS-measured HOMO energy levels (EH,UPS) by the relationship EH,UPS = (1.14 ± 0.23) × qIPC + (4.62 ± 0.10) eV, where q is the electron charge. It is also found that the EAs of the conjugated polymer films measured via CV in conventional (EAC) and Li+ battery (EAB) media can be linearly correlated by the relationship EAB = (1.07 ± 0.13) × EAC + (2.84 ± 0.22) V. The slopes and intercepts of these equations can be correlated with the dielectric constants of the polymer film environments and the redox potentials of the reference electrodes, as modified by the surrounding electrolyte, respectively.

Original languageEnglish (US)
Pages (from-to)19347-19354
Number of pages8
JournalACS Applied Materials and Interfaces
Volume6
Issue number21
DOIs
StatePublished - Jan 1 2014

Keywords

  • conjugated polymer
  • cyclic voltammetry
  • electrolyte
  • electron affinity
  • lithium-ion battery
  • organic photovoltaics

ASJC Scopus subject areas

  • Materials Science(all)

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