Lithium ion battery silicon-based negative electrode binder and preparation method and application thereof

The invention discloses a lithium ion battery silicon-based negative electrode binder and a preparation method and application thereof, and belongs to the technical field of lithium ion battery materials. The method comprises the following steps: 1) mixing an aqueous solution of an emulsifier with an acrylic monomer, an acrylate monomer, a vinyl siloxane monomer and low-molecular-weight hydroxyl polysiloxane, and carrying out stirring ultrasonic treatment for 5-40 min to obtain an emulsion; 2) heating the emulsion to 40-70 DEG C, adding an initiator, reacting for 4-6 hours under the protectionof N2, and regulating the pH value to 6-8 after the reaction is finished, thereby obtaining the silicon-based negative electrode binder of the lithium ion battery. The silicon-based negative electrode binder prepared by the method provided by the invention can effectively inhibit the volume expansion of a silicon negative electrode in the charging and discharging process and improve the cycle performance of the silicon n