Preparation method of comb-shaped positive electrode dispersing material and preparation method of low-internal-resistance electrode plate

A preparation method of a comb-shaped positive electrode dispersing material, comprising the following steps of:

• (1) mixing a solvent, an unsaturated cyclic monomer, unsaturated branched polyether and a (methyl) acrylate monomer to obtain a mixed solution, wherein the solvent is any one or two of N-methylpyrrolidone and N-ethylpyrrolidone;
• the unsaturated cyclic monomer is any one or more of styrene, methylstyrene, vinylpyridine and N-vinylpyrrolidone;
• the unsaturated branched polyether is a starting material prepared by the alkoxylation of a hydroxyl-functional unsaturated starter selected from the group consisting of allyl alcohol, isobutylene alcohol, and isopentenol, the unsaturated branched polyether comprises a polyoxyalkylene chain segment formed by copolymerization of ethylene oxide and propylene oxide monomers onto the starter material, a molecular weight of the unsaturated branched polyether ranges from 500 g/mol to 5,000 g/mol,
• and the (methyl) acrylate monomer is any one or more of hydroxyethyl methylacrylate, hydroxypropyl methacrylate, hydroxybutyl methacrylate, hydroxyethyl acrylate, hydroxypropyl acrylate and hydroxybutyl acrylate;
• (2) heating the mixed solution to a reaction temperature, adding an initiating agent to initiate a reaction, and keeping the reaction temperature for the reaction to obtain a semi-finished product;
• and
• (3) adding phosphoric acid which is equal to the (methyl) acrylate monomer in mole into the semi-finished product for esterification and high-temperature dehydration to obtain the comb-shaped positive dispersing material,
• wherein, in the step (1), a mass ratio of the unsaturated cyclic monomer to the unsaturated branched polyether and the (methyl) acrylate monomer is 2 to 4:4 to 7:1 to 2,
• in the step (2), the initiating agent is any one or more of azodiisobutyronitrile, azodiisoheptylnitrile and dibenzoyl peroxide;
• and according to a mass percentage, an amount of the initiating agent accounts for 0.1% to 3% of a sum of amounts of the unsaturated cyclic monomer, the unsaturated branched polyether and the (methyl) acrylate monomer,
• and in the step (3), a molecular weight of the comb-shaped positive electrode dispersing material ranges from 10,000 g/mol to 60,000 g/mol.