| 摘要 |
There is obtained a material of a positive electrode for a secondary lithium-ion cell having high cycle durability and high safety in high-voltage and high-capacity applications, which is a particulate positive electrode active material for a secondary lithium-ion cell represented by a general formula, LiaCObAcBdOeFf (A is Al or Mg, B is a group-IV transition element, 0.90<=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, and 0.0001<=c+d<=0.03), where element A, element B and fluorine are evenly present in the vicinity of the particle surfaces.
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