Interpretation of variations of jump diffusion coefficient of lithium intercalated into amorphous WO3 electrochromic films
- Garcia-Belmonte, G.
- Vikhrenko, V. S.
- Garcia Canadas, Jorge
- Bisquert, J.
Publication date
May 2004
DOI Publisher
Elsevier BV ISSN
0167-2738 Citation count (estimate)
19Abstract
We report a series of electrochemical analysis of homogeneous a-LixWO3 films of 400 nm thickness prepared by electron beam evaporation technique. Self-diffusion coefficient DJ was analyzed combining measurements of the chemical capacitance, Cch, and chemical diffusion coefficient, Dch, concluding that the barrier height involved in ion hopping increases ∼150 meV within the range of lithium insertion level 0.001<x<0.3. The observed dependences Cch∝xa (a≈0.65) and DJ∝x−c (c≈1.25) suggest that the energy changes governing charge storage and hopping are predominantly determined by the interaction energy of intercalant ions with the host glass
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