POSITIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND MANUFACTURING METHOD THEREOF, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY USING POSITIVE ELECTRODE ACTIVE MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a positive electrode active material which has a good thermal stability and a high charge and discharge capacity when used as a positive electrode material of a nonaqueous electrolyte secondary battery.

SOLUTION: There is provided a method for manufacturing a lithium nickel composite oxide expressed by the general formula, LiNixM1-xO2, where x meets the requirement (4-Z)x≥0.75 when the average valence of Ni is denoted by Z, and M represents at least one kind of additional element such that the average valence of M as a whole is 3.375 or more. The method comprises: (1)a crystallization step for adding an alkali solution to a mixed aqueous solution of Ni salt and M salt to obtain a composite hydroxide NixM1-x(OH)2; (2) a calcination step for mixing the composite hydroxide with lithium compound such that the molar ratio of Li/(Ni+M) is 1.00 to 1.15, and calcining the resultant mixture at a temperature between 700°C or more and 1000°C or less; and (3) a water-washing step for washing a resultant lithium nickel composite oxide by water.

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