This invention relates to the field of battery technology, specifically to a negative
electrode binder, its preparation method, and its application. The negative
electrode binder comprises: a core, wherein the
polymer monomers of the core include
styrene, butadiene, and heterocyclic compounds; and an
ion-conducting network, wherein the
ion-conducting network includes branches and a dynamically cross-linked network, wherein the dynamically cross-linked network is a cross-linked structure obtained by coordination reaction between the branches and
metal ions, wherein the branches include
carboxylic acid-terminated
polyethylene glycol and borate ester-terminated
polyethylene glycol, and the
metal ions include Ca... 2+ Zn 2+ Mg 2+ One or more of the following; the
ion-conducting network is grafted onto the core. Compared with the prior art, the present invention improves the
mechanical strength and adhesion of the binder through butadiene-
styrene doped
heterocyclic compound copolymerization, achieves self-healing of the material through the ion-conducting network, maintains the stability of the internal structure of the battery, and extends the service life of the battery.