Anti-cracking auxiliary agent for negative pole piece of lithium ion battery and preparation method of anti-cracking auxiliary agent

The invention relates to the technical field of lithium batteries, and particularly discloses an anti-cracking auxiliary agent for a negative pole piece of a lithium ion battery and a preparation method of the anti-cracking auxiliary agent. The anti-cracking auxiliary agent for the negative pole piece of the lithium battery comprises the following raw materials: a polyether ester macromonomer, nonionic modified monoester, sodium p-styrenesulfonate, an anionic surfactant, a high-molecular polymer hydrophilic acid, an aromatic organic matter, vinyl ethyl trilactate silane, an initiator I, an initiator II and a pH regulator. The invention relates to a preparation method of an anti-cracking auxiliary agent for a negative pole piece of a lithium ion battery. The preparation method comprises the following steps: 1) preparing a yellowish-brown water-based polymer B from a high-molecular polymer hydrophilic acid, an initiator I and the like under certain reaction conditions; 2) taking a certain amount of aromatic org