| 摘要 |
Provided is a positive-electrode active material for a lithium secondary cell having a layered structure, the positive-electrode active material containing at least nickel, cobalt, and manganese, wherein the following conditions (1)-(3) are satisfied: (1) The positive-electrode active material is represented by compositional formula Li[Lix(NiαCoβMnγMδ)1 - x]O2. (In structural formula (1), 0 ≤ x ≤ 0.10, 0.30 < α ≤ 0.34, 0.30 < β ≤ 0.34, 0.32 ≤ γ < 0.40, 0 ≤ δ ≤ 0.10, β < γ, and δ + α + β + γ = 1; M represents one or more metals selected from the group consisting of Fe, Cu, Ti, Mg, Al, W, Zn, Sn, Zr, Ga, and V.) (2) The secondary particle diameter is 2-10 μm. (3) The micropore distribution obtained by mercury intrusion has a micropore-peak local maximum within a range in which the micropore diameter is 90-150 nm. |
