| abstract |
Electrode for an electrochemical device of the present invention, the general formula: in Li 1 + x MO 2 (1 ) comprising an electrode material mixture layer containing a lithium-containing complex oxide represented by an active material, wherein the general composition formula (1), -0.3 ≤ x ≤ 0.3, and M represents an element group containing Ni, Mn, and Mg, and the number of elements of Ni, Mn, and Mg contained in the element group M to the total number of elements of the element group M. When the ratios are in units of mol%, a, b and c, respectively, 70≤a≤97, 0.5 <b <30, 0.5 <c <30, -10 <bc <10 and -8≤ (bc) / c≤8, and the average valence of Ni is 2.5 to 3.2, the average valence of Mn is 3.5 to 4.2 and the average valence of Mg is 1.8 to 2.2. |