COMPOSITE ELECTRODE MATERIAL AND METHOD OF PRODUCING THE SAME, NEGATIVE ELECTRODE FOR METAL-AIR BATTERY, AND METAL-AIR BATTERY

摘要

The present invention relates to a composite electrode material having a carbon base material and iron oxide particles mainly containing Fe₃O₄ and being supported on the carbon base material and the particles have a D₉₀ of 50 nm or less. In the composite electrode material, since the particle size of the iron oxide particles mainly containing Fe₃O₄ serving as an active material is small, the electron conductivity of the composite electrode material is not considerably reduced even when being covered with a Fe(OH)₂ layer as a reactive intermediate for an electrode reaction. Thus, when the composite electrode material is used, an iron negative electrode having sufficient electron conductivity and charge-discharge cycle characteristics is provided. A negative electrode including the composite electrode material is favorably used as a negative electrode for a metal-air battery.