Lithium transition metal based compound powder and method for manufacturing the same

摘要

The present invention relates to a lithium transition metal based compound powder for a lithium secondary battery positive electrode material, characterized by comprising a lithium transition metal based compound, which has a function of enabling insertion and elimination of lithium ions, as a primary component and being produced by conducting firing after at least one type of compound (hereafter referred to as "Additive 1") containing at least one type of element (hereafter referred to as "Additive element 1") selected from B and Bi and at least one type of compound (hereafter referred to as "Additive 2") containing at least one type of element (hereafter referred to as "Additive element 2") selected from Mo and W are added in combination to a raw material of the primary component at a ratio of a total of Additive 1 and Additive 2 to a total amount of moles of transition metal elements in the raw material of the primary component of 0.01 percent by mole or more, and less than 2 percent by mole, wherein an atomic ratio of Additive elements 1 in total to a total of metal elements other than Li, Additive elements 1, and Additive elements 2 of a surface portion of a primary grain is 20 times or more larger than the atomic ratio on the whole grain basis.