Dispersing agent, preparation method thereof and positive electrode slurry containing dispersing agent

The invention belongs to the technical field of preparation of lithium ion batteries, and particularly relates to a dispersing agent, a preparation method thereof and positive electrode slurry containing the dispersing agent. The dispersing agent comprises a unit a, a unit b, a unit c and a unit d, the unit a, the unit b, the unit c and the unit d are in irregular copolymerization, and according to the molar percentage, the content of the unit a is 10-20%, the content of the unit b is 10-80%, the content of the unit c is 5-70%, and the content of the unit d is 5-10%; wherein R1 is an alkane chain or an olefin chain composed of 5-18 carbon atoms, or N-ethyl ethylenediamine; r2 is an alkane chain composed of 1-3 carbon atoms; r3 is an alkane chain composed of 2-6 carbon atoms; r4 is a polyfluoroalkyl group; and R5, R6, R7 and R8 are hydrogen atoms or methyl groups. The dispersing agent prepared by the method is high in monomer conversion rate, stable in polymer structure, strong in steric hindrance effect and e