Sol-Gel Synthesis of Vanadium Oxide within a Block Copolymer Matrix

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• 作者：Elsa A. Olivetti ; Jong Hak Kim ; Donald R. Sadoway ; Ayse Asatekin ; and Anne M. Mayes
• 刊名：Chemistry of Materials
• 出版年：2006
• 出版时间：June 13, 2006
• 年：2006
• 卷：18
• 期：12
• 页码：2828 - 2833
• 全文大小：526K
• 年卷期：v.18,no.12(June 13, 2006)
• ISSN：1520-5002

文摘

Films consisting of a vanadium pentoxide (i.e., V₂O₅) phase formed within a rubbery block copolymerwere developed for their potential use as nanocomposite cathodes in lithium rechargeable batteries.Nanocomposite films were prepared by sol-gel synthesis from vanadyl triisopropoxide precursor in poly(oligooxyethylene methacrylate)-block-poly(butyl methacrylate), POEM-b-PBMA. The in situ growth ofamorphous V₂O₅ was confirmed by wide-angle X-ray scattering (WAXS), X-ray photoelectronspectroscopy (XPS), and small-angle X-ray scattering (SAXS). Scanning transmission electron microscopy(STEM) and differential scanning calorimetry (DSC) demonstrated the selective incorporation of vanadiumoxide within the ion-conducting POEM domains, while the oxide morphology was revealed by TEM tobe a filamentous network. Cyclic voltammetry and impedance spectroscopy confirmed the preservationof the redox properties of the vanadium oxide and the ion-conductive properties of the polymer in hybridfilms. Co-assembled nanocomposite films incorporating up to 34 wt % (13 vol %) vanadium oxide wereflexible and semi-transparent.