Water adhesive for lithium ion battery, preparation method thereof and lithium ion battery positive plate

The invention relates to aqueous bonding agent for lithium ion batteries, a preparation method and a positive plate for the lithium ion batteries, belonging to the energy storage device such as battery manufacturing field. The aqueous bonding agent for the lithium ion batteries provided by the invention is aqueous polymer emulsion formed after polyvinyl alcohol or ethylidene ether derivatives thereof is taken as a main polymer and two or more than two monomers with different polarities are taken as a graft comonomer to undergo a graft modification in water medium, the solid content of the emulsion is between 5 and 40 percent, and the viscosity is between 200 and 20000 centipoise (40 DEG C). The positive electrode prepared by the aqueous bonding agent for the lithium ion batteries of the invention has higher compacted density, so the volume energy density of the lithium ion batteries is improved; at the same time, the positive plate has good flexibleness after the drying, which contributes to the production of the batteries, improves the finished product rate of battery production, and solves the problems that the positive electrode of the lithium batteries has lower compacted density and the positive plate is brittle and has bad flexibleness after the drying.