METHOD FOR MANUFACTURING POSITIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERIES, POSITIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERIES, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY ARRANGED BY USE THEREOF

摘要

PROBLEM TO BE SOLVED: To provide a simple and safe method for manufacturing a positive electrode active material for nonaqueous electrolyte secondary batteries which enables the achievement of a higher-level balance between thermal stability and charge/discharge capacity, and which is superior in cycle characteristics.SOLUTION: A method for manufacturing a positive electrode active material for nonaqueous electrolyte secondary batteries comprises: a crystallization step for producing a nickel-containing hydroxide expressed by the general formula NiCoM(OH)by adding an alkali aqueous solution to a mix aqueous solution containing at least nickel and cobalt to cause the crystallization thereof; a mixing step for mixing the resultant nickel-containing hydroxide with a lithium compound and a niobium compound into a lithium mixture; and a sintering step for sintering the lithium mixture at a temperature of 700-820°C in an oxidative atmosphere to produce a lithium transition metal complex oxide.