ピッチ系サブミクロン炭素繊維不織布のリチウムイオン電池負極への応用

概要

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The electrochemical performance of a novel mesophase pitch-based carbon-fiber web as an anode material in lithium-ion batteries was investigated. The web has been prepared using an aqueous solution of polyvinyl alcohol without organic solvents. The dispersion of mesophase pitch in a PVA water solution was electrospun to form a web of nanofibers. The web was heat-treated at 2800 °C in argon. Electrically conductive web-based electrodes were fabricated without a copper current collector and binder, which will lead to more compact and economical LIBs. The reversible capacity for a graphite powder used for comparison was larger than that for the web at lower rates (50-100 mA/g), but the capacity for the web was lager than that for the graphite powder at higher rates (100-3000 mA/g). The results are partially attributable to the difference in their specific surface areas. The capacity and the rate performance of the mesophase pitch-based carbon-fiber web at higher rates improved when the web was pulverized due to an increase of the specific surface area.