Structural Aspects Related to Lithium Intercalation and Ionic Dynamics: Frequency Response Analysis of (Sn_x,Ti_1-x)O₂ Based Systems

Paulo R. Bueno^a,* and Luis O.S. Bulhões^b

 

^a) Departamento de Físico-Química, Instituto de Química, Universidade Estadual Paulista, R. Francisco Degni, s/n, CEP. 14800-900, Araraquara, SP, Brasil

^b) Departamento de Química, Universidade Federal de São Carlos, Rod. Washington Luiz, km 235, CEP. 13560-905, São Carlos, São Paulo, Brazil.

Received 20 January 2008; accepted 9 September 2008

 

Abstract

Diffusion models capable of describing the ionic diffusion inside host materials, e.g. oxides, during intercalation processes, have been reported in the literature. However, the majority of the models do not succeed in establishing a good correlation between diffusion and structural environment. What is frequently described is the influence of an addition solid state reaction. In this paper we discuss about such additional reaction and its influence on the diffusion. The responses were evaluated by means of impedance patterns analyzed in (Sn_x,Ti_1-x)O₂ binary systems whose structural disorder control provides a way to evaluate how such structural disorder influences the global diffusion.

Keywords: ionic intercalation, diffusion, impedance spectroscopy.

 

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*Corresponding author. E-mail address: prbueno@iq.unesp.br