Films consisting of a vanadium pentoxide ͑i.e., V 2 O 5 ͒ phase formed within a rubbery block copolymer were developed for their potential use as nanocomposite cathodes in lithium rechargeable batteries. Films were prepared by sol-gel synthesis from vanadyl triisopropoxide precursor in poly͑oligooxyethylene methacrylate͒-block-poly͑butyl methacrylate͒, incorporating LiCF 3 SO 3 and carbon black as conductivity additives. The morphology of the films was examined using electron microscopy, and

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... ir electrochemical performance was assessed by galvanostatic cycling. An all-solid-state battery comprising a polymer-based cathode and a block copolymer electrolyte was cycled repeatedly. The capacity was measured to be 40 mAh/g and found to be limited by the conductivity of the polymer electrolyte. A comparison between a nanocomposite cathode and a control cathode with the same carbon:vanadium oxide ratio demonstrated higher rate capability for the nanocomposite sample when paired with a liquid electrolyte. This study demonstrates the potential utility of block copolymers in the fabrication of high-surface-area cathodes for lithium batteries.