Positive electrode plate and lithium-ion secondary battery

A process for preparing a positive electrode plate, comprising the steps of:

• mixing a first positive active material, a conductive agent, a binder, and a solvent to prepare a pre-slurry;
• mixing a second positive active material with the pre-slurry to form a positive electrode slurry;
• and
• coating the positive electrode slurry onto at least one surface of a positive electrode current collector to prepare the positive electrode plate;
• wherein the first positive active material is a compound represented by formula (1), and the second positive active material is a compound represented by formula (2),
• Li1+xNiaCObM1−a−bO2−yAy (1)
• in the formula (1), −0.1x<0.2, 0<a<1, 0<b<1, 0<a+b<1, 0y<0.2;
• M comprises one or more of Mn, Fe, Cr, Ti, Zn, V, Al, Zr and Ce;
• and A comprises one or more of S, N, F, Cl, Br and I,
• Li1+zMncN2−cO4−dBd (2)
• in the formula (2), −0.1z0.2, 0<c2, 0d<1;
• N comprises one or more of Ni, Fe, Cr, Ti, Zn, V, Al, Mg, Zr and Ce;
• and B comprises one or more of S, N, F, Cl, Br and I.