Method for producing positive electrode active material for secondary batteries

Abstract

A method for producing a positive electrode active material for secondary batteries according to the present invention is characterized by comprising: a water washing step in which a slurry that is obtained by mixing an Ni-containing lithium transition metal oxide with water or an aqueous solution is stirred, thereby water washing the Ni-containing lithium transition metal oxide; a solid-liquid separation step in which the slurry is subjected to solid-liquid separation, thereby obtaining a cake that contains the Ni-containing lithium transition metal oxide; and a drying step in which the cake is dried. This method for producing a positive electrode active material for secondary batteries is also characterized in that a sulfonic acid compound represented by general formula (I) (wherein A represents H, Li or Na, and R represents H or a hydrocarbon group) is added to the slurry in the water washing step.

Dependencies are inferred from the claim text.