| 摘要 |
The present invention provides a lithium-containing composite oxide for a positive electrode for a lithium secondary battery, which has a large volume capacity density and high safety, and excellent durability for charge and discharge cycles and charge and discharge rate property, and its production method. The lithium-containing composite oxide is represented by the general formula LipNxMyOzFa (where N is at least one element selected from the group consisting of Co, Mn and Ni, M is at least one element selected from the group consisting of Al, Sn, alkaline earth metal elements and transition metal elements other than Co, Mn and Ni, 0.9≰p≰1.2, 0.965≰x<2.00, 0<y≰0.035, 1.9≰z≰4.2, and 0≰a≰0.05), wherein when a powder of the lithium-containing composite oxide is classified into small particles with an average particle size of 2μm≰Ds50≰8μm and large particles with an average particle size of 10μm≰Dl50≰25μm, a content of the small particles is from 15 to 40% by weight and a content of the large particles is from 60 to 85% by weight, and 0.01≰ys≰0.06, 0≰yl≰0.02 and 0≰yl/ys<1, where (ys) is a ratio of the M element in the above general formula in the small particles and (yl) is a ratio of the M element in the general formula in the large particles.
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