Explicit analysis of impedance spectra related to thin films of spinel LiMn2O4

M. Mohamedi, D. Takahashi, T. Uchiyama, T. Itoh, M. Nishizawa, I. Uchida

Research output: Contribution to journalArticlepeer-review

83 Citations (Scopus)

Abstract

A uniform, dense film of spinel LiMn2O4 (0.1 μm thick) has been prepared by the electrostatic spray deposition (ESD) technique. The electroanalytical behavior of this electrode is elucidated by application of electrochemical impedance spectroscopy (EIS). The data have been modeled using an equivalent circuit approach. An excellent fit was found between measured data and an equivalent circuit, comprising Li+ migration through surface film, potential-dependent charge transfer resistance, semiinfinite Warburg-type element, reflecting solid state Li+ ion diffusion and a finite space Warburg-type element, describing both diffusion and accumulation of lithium at the very low frequency. The apparent chemical diffusion coefficient of lithium in the spinel phase was found within 10-12<DLi<10-9 cm2 s-1 as a function of electrode potential with minima at the potentials corresponding to the voltammetric peaks. The intercalation capacitance was found 0.7<CL<47 mF cm-2 exhibiting maxima at the potentials corresponding to the voltammetric peaks.

Original languageEnglish
Pages (from-to)93-103
Number of pages11
JournalJournal of Power Sources
Volume93
Issue number1-2
DOIs
Publication statusPublished - 2001 Feb 1

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'Explicit analysis of impedance spectra related to thin films of spinel LiMn<sub>2</sub>O<sub>4</sub>'. Together they form a unique fingerprint.

Cite this