McDermott Will & Emery LLP
Positive-electrode active material for lithium secondary cell, positive electrode for lithium secondary cell, and lithium secondary cell
A positive electrode active material for a lithium secondary cell, having a layered structure and comprising at least nickel, cobalt and manganese, the positive electrode active material satisfying requirements (1), (2) and (3) below: (1) a composition represented by a composition formula: Li[Lix(NiαCoβMnγMδ)1-x]O2, wherein 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, δ+α+β+γ=1, M represents at least one metal selected from the group consisting of Fe, Cu, Ti, Mg, Al, W, Zn, Sn, Zr, Ga and V; (2) a secondary particle diameter of 2 μm or more and 10 μm or less; and (3) a maximum peak value in a pore diameter range of 90 nm to 150 nm in a pore diameter distribution determined by mercury porosimetry.
TANAKA CHEMICAL CORPORATION SUMITOMO CHEMICAL COMPANY, LIMITED
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Takaaki Daisuke Hiroyuki Yasutaka Hiroyuki Jun-ichi Yuichiro
Masukawa Yamashita Kurita Iida Ito Kageura Imanari