| abstract |
This invention relates to a positive electrode material for lithium ion secondary battery that is for high voltage and high capacity uses and ensures high cycle durability and high safety, comprising a granular active substance of positive electrode for lithium ion secondary battery represented by the general formula LiaCobAcBdOcFf (in which A is Al or Mg; B is a transition element of Group 4; 090 ≤ a ≤ 1.10, 0.97 ≤ b ≤ 1.00, 0.0001 ≤ c ≤ 0.03, 0.0001 ≤ d ≤ 0.03, 1.98 ≤ e ≤ 2.02, 0 ≤ f ≤ 0.02, 0.0001 ≤ c+d ≤ 0.03), the element A, the element B and the fluorine uniformly existing in the vicinity of grain surface. |