Abstract

A composite electrode composed of a conductive polymer and an alkali‐metal alloy has been investigated as the negative electrode for a nonaqueous rechargeable cell. A sodium‐alloy based composite electrode composed of , poly(p‐phenylene), and binder achieved a capacity of 234 mAh/g or 450 mAh/cm3. This electrode also exhibited excellent cycle life and rate capability without dendrite formation. The composite electrode exhibited kinetic behavior similar to that of pure sodium metal. A balanced cell was constructed by combining the above sodium‐ion‐inserting composite negative electrode with a sodium‐ion‐inserting positive electrode, , of approximately equal capacity. The cell exhibited excellent cycle life (>250 cycles). The semiempirical energy density of the electrode system is comparable to alternative lithium metal based cell such as assuming that excess Li is needed in the latter case.

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