Lithium-supplementing additive, method for preparing the same, positive electrode material, positive electrode plate, and battery

A method for preparing a lithium-supplementing additive, comprising the following steps:

• preparing a precursor material using a spray pyrolysis treatment;
• and
• mixing the precursor material with a lithium source and performing a calcination treatment to obtain a lithium-containing compound;
• wherein the lithium-supplementing additive comprises a lithium-containing compound, and the lithium-containing compound is selected from a group consisting of compounds represented by the following chemical formula (I):
• wherein M and N are each independently selected from a group consisting of Zr, Co, Sr, Al, Ni, W, Ti, Cu, Mg, Zn, Ca, Ba, Sc, Ga, Y, La, In, Ce, Ge, Hf, Sn, Nb, Ta, V, and Sb, and X is fluorine (F);
• 0.4≤a≤0.9, 0<α≤1, 0≤β≤1, 0<(α+β)≤1, 0≤γ ≤0.1, 0<δ≤1, 0≤ε≤1, 0<(δ+ε)≤1, and 0≤η≤0.1.

A positive electrode material, comprising a positive electrode active material and a lithium-supplementing additive, the lithium-supplementing additive comprising a lithium-containing compound, wherein the lithium-containing compound is selected from a group consisting of compounds represented by the following chemical formula (I):

• wherein M and N are each independently selected from a group consisting of Zr, Co, Sr, Al, Ni, W, Ti, Cu, Mg, Zn, Ca, Ba, Sc, Ga, Y, La, In, Ce, Ge, Hf, Sn, Nb, Ta, V, and Sb, and X is fluorine (F);
• 0.4≤a≤0.9, 0<α≤1, 0≤β≤1, 0<(α+β)≤1, 0≤γ ≤0.1, 0<δ≤−1, 0≤ε≤1, 0<(δ+ε)≤1, and 0≤η≤0.1;
• and
• wherein the lithium-supplementing additive has a surface alkalinity of 10 μmol·g−1 to 400 μmol·g−1.