Evaluation of lithium ion insertion reactivity via electrochromic diffraction-based imaging

Lilia V. Kondrachova, R. Alan May, Craig W. Cone, David A.Vanden Bout, Keith J. Stevenson

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

A microscope-CCD setup has been developed as an analytical tool for the detection of diffraction from one-dimensional redox-active transition-metal oxide gratings prepared with a combination of micro transfer molding (μTM) and cathodic electrodeposition. The diffraction efficiencies (DE) of tungsten trioxide, WO 3, and binary molybdenum-tungsten trioxide, Mo 0.6W 0.4O 3, gratings were measured during Li + insertion/deinsertion experiments performed with both cyclic voltammetry and chronoamperometry in 1 M LiClO 4/propylene carbonate. The DE was evaluated in terms of the optical constants of the grating materials determined by spectroscopic ellipsometry (SE) measurements of Li + insertion/deinsertion into unpatterned thin films. The effect of grating thickness and the amount of inserted charge on DE has been analyzed. The diffraction method is used to quantitatively estimate lithium ion diffusion coefficients of electrochemically active metal oxide gratings.

Original languageEnglish
Pages (from-to)2508-2518
Number of pages11
JournalLangmuir
Volume25
Issue number4
DOIs
Publication statusPublished - 17 Feb 2009
Externally publishedYes

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