AIR ELECTRODE MATERIAL, AIR ELECTRODE, METAL-AIR BATTERY, AND FUEL CELL

An air electrode material according to the present disclosure contains a plurality of composite particles, wherein each of the composite particles contains a core particle and a plurality of coveringparticles covering the core particle, the core particle is formed of a material with catalytic activity for an oxygen reduction reaction, the covering particles are formed of an electrically conductive material and are mechanically bonded to the core particles or other covering particles, and the median size of the core particles ranges from 100 to 1000 times the average primary particle size of the covering particles. 本发明提供种能以低的制造成本形成体积电阻率小的空气极催化剂层的空气极材料。本发明的空气极材料的特征在于，包含多个复合粒子，上述复合粒子是芯粒子和覆盖上述芯粒子的表面的多个覆盖粒子复合化而成的粒子，上述芯粒子包括对氧化还原反应具有催化活性的材料，上述覆盖粒子包括具有导电性的材料，并且与上述芯粒子或者其它覆盖粒子机械地结合，上述芯粒子的中值粒径为上述覆盖粒子的次粒子的平均粒径的100倍以上且1000倍以下。