| 摘要 |
PURPOSE: Provided is a cathode active material for lithium ion secondary battery, which has a low irreversible capacity, and low reduction of capacity in continuous charging/discharging. CONSTITUTION: The cathode active material for lithium ion secondary battery, is represented by formula LiwNi1-x-y-zCoxM'yM"zO2(wherein, M' is selected from the group consisting of Al, B, Mn and Mg, M" is selected from the group consisting of Al, B, Mn and Mg, 0.97 <= w <= 1.05, 0.80 <= 1-x-y-z <= 0.85, 0.11 <= x <= 0.18, 0.02 <= y+z <= 0.04). The cathode active material has an average diameter of 0.5-50 micron, specific surface area of 0.2-5 g/m¬2, and tap density of 1.7-3 g/cc.
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