Patent ID: 7998619

Claim:
A positive-electrode material for lithium secondary battery, which comprises secondary particle of a lithium/transition metal composite oxide containing boron and/or bismuth, and wherein the atomic ratio of the sum of boron and bismuth to the sum of the metallic elements other than lithium, boron, and bismuth in a surface part of the secondary particle is 8 times or more the atomic ratio in the whole secondary particle; wherein the lithium/transition metal compound containing boron and/or bismuth is one represented by the following formula (1): Li x M y Bi v B w O 2 (1) wherein M represents at least one element selected from transition metals, alkali metals, alkaline earth metals, halogen elements, and chalcogen elements; and x, y, v, and w respectively represent numbers satisfying the relationships 0<x≦1.2, 0.9≦y≦1.1, and 0≦v≦0.1, and 0≦w≦0.1 (provided that at least one of v and w is not 0).