On the Performances of CuxO-TiO2 (x = 1, 2) Nanomaterials As Innovative Anodes for Thin Film Lithium Batteries

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• 作者：D. Barreca ; G. Carraro ; A. Gasparotto ; C. Maccato ; M. Cruz-Yusta ; J. L. G贸mez-Camer ; J. Morales ; C. Sada ; L. S谩nchez
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2012
• 出版时间：July 25, 2012
• 年：2012
• 卷：4
• 期：7
• 页码：3610-3619
• 全文大小：622K
• 年卷期：v.4,no.7(July 25, 2012)
• ISSN：1944-8252

文摘

Cu_xO-TiO₂ (x = 1, 2) nanomaterials are synthesized on polycrystalline Ti substrates by a convenient chemical vapor deposition (CVD) approach, based on the initial growth of a Cu_xO matrix (at 400 and 550 掳C for x = 1 and 2, respectively) and the subsequent overdispersion of TiO₂ at 400 掳C. All CVD processes are carried out in an oxygen atmosphere saturated with water vapor. The obtained systems are investigated by means of glancing incidence X-ray diffraction (GIXRD), X-ray photoelectron spectroscopy (XPS), secondary ion mass spectrometry (SIMS), field emission-scanning electron microscopy (FE-SEM), atomic force microscopy (AFM), and electrochemical experiments. Galvanostatic charge/discharge measurements indicate that Cu₂O-TiO₂ nanomaterials exhibit very attractive high-rate capabilities (400 mA h g^鈥? at 1 C; 325 mA h g^鈥? at 2 C) and good stability after 50 operating cycles, with a retention of 80% of the initial capacity. This phenomenon is mainly due to the presence of TiO₂ acting as a buffer material, i.e., minimizing volume changes occurring in the electrochemical conversion. In a different way, CuO鈥揟iO₂ systems exhibit worse electrochemical performances as a consequence of their porous morphology and higher thickness. In both cases, the obtained values are among the best ever reported for Cu_xO-based systems, candidating the present nanomaterials as extremely promising anodes for eventual applications in thin film lithium batteries.

Keywords:

chemical vapor deposition; copper oxides; titanium dioxide; energy storage; thin film lithium batteries