| 摘要 |
A cathode material with excellent capacity and output characteristies and safety, and a lithium ion secondary battery using the same is provided. The invention relates to a cathode material which includes a mixture of a cathode active material having a large primary particle size with excellent capacity characteristics and represented by the composition formula: Li x1 Ni a1 Mn b1 Co c1 O 2 , where 0.2 ‰¤ x1 ‰¤ 1.2, 0.6 ‰¤ a1, 0.05 ‰¤ b1 ‰¤ 0.3, 0.05 ‰¤ c1 ‰¤ 0.3, and another cathode active material having a small primary particle size with excellent output characteristics and represented by the composition formula: Li x2 Ni a2 Mn b2 Co c2 O 2 , where 0.2 ‰¤ x2 ‰¤ 1.2, a2 ‰¤ 0.5, 0.05 ‰¤ b2 ‰¤ 0.5, 0.05 ‰¤ c2 ‰¤ 0.5. The invention also relates to a lithium ion secondary battery using the cathode material. Fig. 1 |
