POSITIVE ELECTRODE MATERIAL FOR NONAQUEOUS SECONDARY BATTERY AND MANUFACTURING METHOD THEREOF, AND POSITIVE ELECTRODE FOR NONAQUEOUS SECONDARY BATTERY USING POSITIVE ELECTRODE MATERIAL FOR NONAQUEOUS SECONDARY BATTERY AND NONAQUEOUS SECONDARY BATTERY USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a nonaqueous secondary battery which has a high capacity and which has superior charge and discharge cycle characteristics even under a high-voltage condition.SOLUTION: A positive electrode material for a nonaqueous secondary battery comprises lithium-containing composite oxide particles, each including: an outermost surface; a surface layer portion ranging from the outermost surface to a depth of at least 2 nm; and a bulk portion located inward from the surface layer portion. The bulk portion has a composition expressed by the following general formula: LiMO(where M is a single transition metal element or transition metal element group including at least one selected from Co, Ni and Mn). On the outermost surface, a granular Zr oxide having an average particle diameter of 30 nm or less is disposed. A deposit portion is where the Zr oxide is disposed in a region of the outermost surface, and a non-deposit portion is with no Zr oxide deposited; the area of the non-deposit portion is 50-97% of the total area of the outermost surface. The surface layer portion in the non-deposit portion includes M and Zr. The percentage of the total number of Zr atoms included in the surface layer portion in the non-deposit portion to the total number of M atoms included in the surface layer portion in the non-deposit portion is 3-40 atom%.SELECTED DRAWING: Figure 1