Ordered mesoporous titanium oxide for thin film microbatteries with enhanced lithium storage

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Title: Ordered mesoporous titanium oxide for thin film microbatteries with enhanced lithium storage
Authors: Ortiz, Gregorio F. | Berenguer-Murcia, Ángel | Cabello, Marta | Cazorla-Amorós, Diego | Tirado, José L.
Research Group/s: Materiales Carbonosos y Medio Ambiente
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Ordered mesoporous TiO2 | Binder-free electrodes | Li-ion microbatteries | Improved lithium storage
Knowledge Area: Química Inorgánica
Issue Date: 1-Jun-2015
Publisher: Elsevier
Citation: Electrochimica Acta. 2015, 166: 293-301. doi:10.1016/j.electacta.2015.03.034
Abstract: A 3D mesoporous TiO2 material with well-developed mesostructure is prepared in the form of a binder-free thin (100 nm) film and studied as potential candidate for the negative electrode in lithium microbatteries. By appropriate thermal treatments, the selected crystal structure (anatase, rutile, or amorphous), and micro-/mesostructure of the materials was obtained. The effects of voltage window and prelithiation treatment improved first cycle reversibility up to 86% and capacity retention of 90% over 100 cycles. After a prolonged intercalation of lithium ions in ordered mesoporous TiO2 appeared small particles assigned to Li2Ti2O4 with cubic structure as observed from ex-situ TEM micrographs. This study highlights the flexibility of the potential window to which the electrode can operate. Maximum capacity values over 100 cycles of 470 μA h cm−2 μm−1 and 177 μA h cm−2 μm−1 are obtained for voltage ranges of 0.1–2.6 V and 1.0–2.6 V, respectively. The observed values are between 6 and 2 times higher than those obtained for films with 600 nm (80 μA h cm−2 μm−1) and 900 nm (92 μA h cm−2 μm−1) lengths. This indicates that 100 nm thin TiO2 films with high accessibility show finite-length type diffusion which is interesting for this particular application.
Sponsor: We thank the Spanish Ministry of Economy and Competitiveness and FEDER (MINECO Projects CTQ2012-31762 and MAT2011-22753) and Junta de Andalucía (FQM7206) for financial support. A.B.M. and G.F.O thank the MINECO for their Ramón y Cajal Fellowships (RyC 2009-03913 and 2010-05596, respectively).
URI: http://hdl.handle.net/10045/57886
ISSN: 0013-4686 (Print) | 1873-3859 (Online)
DOI: 10.1016/j.electacta.2015.03.034
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2015 Elsevier Ltd.
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.electacta.2015.03.034
Appears in Collections:INV - MCMA - Artículos de Revistas

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