Preparation method of diaphragm coating slurry, lithium battery diaphragm and application

The invention relates to a preparation method of diaphragm coating slurry, a lithium battery diaphragm and application, and the preparation method comprises the following steps: mixing deionized water, a dispersing agent, a thickening agent and a first wetting agent according to a required proportion, and uniformly stirring; adding an acrylate copolymer CFL powder material, uniformly stirring, sanding by using the sand mill until the particle size is reduced to D50 less than 600nm and D100 less than 20mu m, adding a second wetting agent, and uniformly stirring; and adding a binder, and uniformly stirring to obtain the required diaphragm coating slurry. According to the preparation method of the diaphragm coating slurry provided by the invention, the wetting agent is added twice, so that the wetting effect of the diaphragm coating slurry is enhanced, the problems of material accumulation, coating omission and stripes in the subsequent coating process are avoided, the uniformity and qualification rate of the di