Precursor of lithium-containing oxide cathode material, lithium-containing oxide cathode material, preparation methods therefor and use thereof, and positive electrode plate and use thereof

A preparation method of a lithium-containing oxide cathode material, the preparation method comprising:

• S1:
• uniformly mixing a precursor having a chemical formula represented by Formula (1), a lithium source, and an optional additive containing element M2, and performing a first sintering in an atmosphere furnace, to obtain a primary sintered material having a chemical formula represented by Formula (2);
• and
• S2:
• uniformly mixing the primary sintered material with an additive containing element M′, and performing a second sintering on the mixed material in an atmosphere furnace, to obtain a lithium-containing metal oxide having a chemical formula represented by Formula (3),
• NiuMnvM1γ(OH)2, Formula (1), where:
• u+v+y=1, 0.2<u<1, 0<v≤0.75, 0≤γ≤0.35, and M1 is selected from at least one element of Al, Zr, Nb, Ti, Y, Sc, Cr, Co, W, Mg, Na, La, Os, Pr, Re, Ru, Sr, Sm, Ta, and B;
• Li[LiaNixMnyMj]O2, Formula (2);
• Li[LiaNixMnyMj]O2@M′, Formula (3);
• wherein in Formula (2) and Formula (3), a+x+y+j=1, 0≤a≤0.3, 0.2<x<1, 0<y≤0.75, 0<j≤0.35;
• and M comprises element M1 in the precursor and element M2 introduced during the first sintering, M1 and M2 being the same or different and being each selected from at least one element of Al, Zr, Nb, Ti, Y, Sc, Cr, Co, W, Mg, La, Os, Pr, Re, Ru, Sr, Sm, Ta, and B;
• and
• wherein in Formula (3), M′ is oxide, phosphide, sulfide, fluoride, or chloride containing at least one element of Al, Zr, Nb, Ti, Y, Sc, Cr, Co, W, Mg, La, Os, Pr, Re, Ru, Sr, Sm, Ta, and B, and a molar content of cations in M′ is w, w satisfying 0<w/(a+x+y+j)≤0.1.