Battery, positive electrode plate, positive electrode slurry, and dispersant and preparation method thereof

A positive electrode slurry, comprising a positive electrode active material, a dispersant, and a solvent, wherein the dispersant comprises a polyester compound, the polyester compound comprises a structural unit A and/or a structural unit B, the structural unit A has a chemical formula of

• and the structural unit B has a chemical formula of
• wherein
• R1 and R2 are each selected from at least one of C0, a C1-C18 alkyl group, and a C6-C18 aryl group;
• and R3 and R4 are each selected from H, a C1-C18 alkyl group, a C6-C18 aryl group, and an ester group, wherein the dispersant accounts for 0.01%-3.0% of a total weight of the positive electrode slurry, wherein the dispersant accounts for 0.03%-2.0% of the total weight of the positive electrode slurry.

A dispersant, comprising a polyester compound, wherein the polyester compound comprises a structural unit A and/or a structural unit B, the structural unit A has a chemical formula of

• and the structural unit B has a chemical formula of
• wherein
• R1 and R2 are each selected from at least one of C0, a C1-C18 alkyl group, and a C6-C18 aryl group;
• and R3 and R4 are each selected from H, a C1-C18 alkyl group, a C6-C18 aryl group, and an ester group,
• wherein the polyester compound further comprises at least one substituent group G, and G comprises at least one of a sulfonic acid group and a derivative thereof, and a phosphonic acid group and a derivative thereof, wherein
• G is a terminal group of the polyester compound;
• the sulfonic acid group and the derivative thereof have a chemical formula of
• the phosphonic acid group and the derivative thereof have a chemical formula of
• wherein
• R6 is selected from any one of H, an alkyl group, alkyl alcohol, alkyl hydroxylamine, a fatty ester group, and an aromatic ester group;
• where
• the alkyl group has a chemical formula of
• the alkyl alcohol has a chemical formula of
• the alkyl hydroxylamine has a chemical formula of
• the fatty ester group has a chemical formula of
• the aromatic ester group has a chemical formula of
• a value of e is in a range of 1-12, a value of f is in a range of 1-16, and carbon atoms in Ar have a quantity of not exceeding 12,
• wherein a value of d ranges from greater than 1 and less than or equal to 12.