摘要 |
PROBLEM TO BE SOLVED: To provide an active material for nonaqueous electrolyte secondary batteries excellent in high rate discharge performance, a manufacturing method thereof, and a nonaqueous electrolyte secondary battery using the active material.SOLUTION: Disclosed is an active material for nonaqueous electrolyte secondary batteries, the material containing a lithium transition metal composite oxide having an α-NaFeOtype crystal structure, the average composition of the lithium transition metal composite oxide being as expressed by a composition formula LiMeO(Me is a transition metal containing Co, Ni, and Mn, α>0), the lithium transition metal composite oxide being particles having cores and coating parts, cobalt concentration of the coating parts being higher than that of the cores, manganese concentration of the coating parts being lower than that of the cores, and the ratio of cobalt present in the coating parts against the amount of the transition metal present in the cores is between 3% and 10% in a molar ratio. |