Lithium intercalation in nanostructured thin films of a mixed-valence layered vanadium oxide using an ionic liquid electrolyte

JOURNAL OF POWER SOURCES

卷:224

Article

Benedetti, Tania M.¹  Redston, Emily¹  Menezes, Willian G.²  Reis, Dayane M.²  Soares, Jaisa F.²  Zarbin, Aldo J. G.²  Torresi, Roberto M.¹ 

[1] Univ Sao Paulo, Inst Quim, BR-05513970 Sao Paulo, Brazil

[2] Univ Fed Parana UFPR, Dept Quim, BR-81530900 Curitiba, Parana, Brazil

关键词: Lithium microbatteries;    Vanadium oxide;    Ionic liquids;    Layer-by-layer;    Adsorption isotherm;    Adsorption kinetic;   

DOI  :  10.1016/j.jpowsour.2012.09.058

来源: Elsevier

【 摘 要 】

Nanostructured thin films of a mixed-valence, layered vanadium oxide were prepared using layer-by-layer deposition. The thin films were characterized by electronic (UV-vis) spectroscopy, quartz crystal microbalance, profilometry and scanning electron microscopy techniques. The highest charge capacity was obtained for films that consisted of 25 bilayers. The electrochemical characterization of the films was performed in conventional organic solvent and ionic liquid (IL) based electrolytes. The results revealed better performance, in terms of stability during consecutive charge/discharge cycles, when ILs were employed. This can be attributed to several factors, including reduced mechanical stress caused by insertion of more than 1 mol of Li+ per mol of V5+ in the film structure, decrease of crystallinity in the electrode material during the first few charge/discharge cycles and/or formation of a more compatible SEL Nanostructured thin films of layered vanadium oxide prepared using layer-by-layer deposition showed potential for applications in lithium microbatteries. (C) 2012 Elsevier B.V. All rights reserved.

【 授权许可】

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