| abstract |
A positive electrode active material for an aqueous lithium secondary battery capable of exhibiting a high capacity even when the charge / discharge rate is increased and maintaining a high capacity even after repeated charge / discharge, a method for producing the same, and the positive electrode active material To provide an aqueous lithium secondary battery using a substance. A positive electrode active material for an aqueous lithium secondary battery comprising a lithium iron phosphate compound having an olivine structure. This positive electrode active material consists of irregularly shaped particles having a plurality of particulate convex portions having a particle size of 1 μm or less on the surface. In the production, a raw material dispersion step and a heat treatment step are performed. In the raw material dispersion step, the raw material is dispersed in a polar solvent so that the molar concentration of the iron element is 3 mol / L or less to produce a raw material slurry. In the heat treatment step, the raw slurry is heated. Further, the present invention is a water based lithium secondary battery using a positive electrode active material made of irregularly shaped particles. [Selection] Figure 1 |