Patent ID: 7504180
Filing Date: 2009-03-17
Classification: C01G,C01P,H01M,Y02E

Abstract:
1. A material of a positive electrode for a secondary lithium cell, comprising a particulate active material of positive electrode for a secondary lithium-ion cell represented by a general formula, Li a Co b A c B d O e F f , wherein 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 0.002≦c+d≦0.02, said element A, element B and fluorine are evenly present in a vicinity of particle surfaces; a single-component oxide of said element B is 20% or less; and no diffraction peaks are observed at 2θ of 28±1° in a high-sensitivity X-ray diffraction spectrum using Cu-Kα ray.