| abstract |
Cathode active materials have composite particles each with a base particle having the following formula: Li α ,Ni x M y Co z O 2 , wherein 0.95 ≤ α ≤ 1.5, 0.6 ≤ x ≤ 1.0, 0 ≤ y ≤ 0.5, 0 ≤ z ≤ 0.5; x + y + z = 1; and M is one of Mn and Al, and coating particles coating each base particle, the coating particles having the following formula: Li a Ni b Mn c Co d O 2 , wherein 0.95 ≤ a ≤ 1.5, 0 ≤ b ≤ 0.35, 0 ≤ c ≤ 1.0, 0 ≤ d ≤ 1.0 and b + c + d = 1. |