Pseudocapacitive Lithium Storage in TiO2(B)

Phase-pure TiO2(B) with microfibrous morphology was prepared via a newly developed method from amorphous TiO2. Cyclic voltammetry evidences that Li-insertion into TiO2(B) is governed by a pseudocapacitive faradaic process, whose rate is not limited by solid-state diffusion of Li+ in a broad interval...

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Bibliographic Details
Published in:Chemistry of materials 2005-03, Vol.17 (5), p.1248-1255
Main Authors: Zukalová, Markéta, Kalbáč, Martin, Kavan, Ladislav, Exnar, Ivan, Graetzel, Michael
Format: Article
Language:English
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Summary:Phase-pure TiO2(B) with microfibrous morphology was prepared via a newly developed method from amorphous TiO2. Cyclic voltammetry evidences that Li-insertion into TiO2(B) is governed by a pseudocapacitive faradaic process, whose rate is not limited by solid-state diffusion of Li+ in a broad interval of scan rates. This unusual behavior was discussed in terms of the crystal structure of the TiO2(B) host, having freely accessible parallel channels for Li+-transport perpendicular to the (010) face. The characteristic Li-insertion electrochemistry of TiO2(B) allows re-interpretation of several previous reports, which did not consider explicitly this relation or the presence of TiO2(B) in various TiO2 materials of different origin.
ISSN:0897-4756
1520-5002
DOI:10.1021/cm048249t