Development of high power density electrode system on the basis ofconstruction of ionic conduction channel of hierarchic structure

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Lithium diffusion coefficient in maghemite(γ-Fe2O3) was first and electrochemically determined. A composite material of the maghemite nanoparticles and ketjenblack, which was a structural and electrically conducting medium, was fabricated as hierarchically structural material possessing nano-and meso-scale ionic conduction channel. It was examined as cathode of lithium-air battery and exhibited good performance in terms of both reversibility and cyclability.Iron-based layer compounds CaFeO2 and SrFeO2 were found to serve as anodes of lithium ion battery through conversion reactions. In particular, CaFeO2 showed higher specific capacity than expected on the basis on the conversion reaction, which was probably attributed to alloying reaction of calcium and lithium.