Positive-electrode plate and manufacturing method thereof, lithium-ion secondary battery, battery module, battery pack, and apparatus

A positive-electrode plate, comprising a current collector, and a first active substance layer and a second active substance layer that are sequentially disposed on a surface of the current collector, wherein

• the first active substance layer comprises a first positive-electrode active material, and the first positive-electrode active material comprises at least one of a compound represented by Formula (I) or a compound represented by Formula (II):
• Li1+x1Mna1M1-a1O2-y1Ay1 Formula (I)
• wherein −0.1≤x1≤0.2, 0.5≤a1≤1, 0≤y1<0.2, M comprises one or more of Ni, Fe, Cr, Co, Ti, Zn, V, Al, Zr, and Ce, and A comprises one or more of S, N, F, Cl, Br, and I;
• Li1+x2Mna2N2-a2O4-y2By2 Formula (II)
• in the Formula (II), −0.1≤x2≤0.2, 1.5≤a2≤2, 0≤y2<0.5, N comprises one or more of Ni, Fe, Cr, Co, Ti, Zn, V, Al, Zr, and Ce, and B comprises one or more of S, N, F, Cl, Br, and I;
• and
• the second active substance layer comprises a second positive-electrode active material having a pH value of from 10 to 12.