The invention relates to the technical field of
lithium ion batteries, in particular to a
ceramic coated
lithium ion battery diaphragm and a preparation method thereof.The preparation method of the
ceramic coated
lithium ion battery diaphragm comprises the steps that a dispersing agent and
ceramic particles are sequentially added into deionized water to be stirred and mixed, and ceramic dispersion liquid is prepared; adding a
thickening agent into the ceramic dispersion liquid, stirring and dissolving, then adding a binder and a
wetting aid, stirring until a uniform dispersion liquid is formed, and then adding a
wetting agent, stirring and mixing to prepare ceramic
slurry;
coating one surface or two surfaces of a
polyolefin base membrane with the ceramic
slurry, and
drying to obtain the ceramic coated
lithium ion battery diaphragm; according to the invention, the amphiphilic
polymer wetting aid is used as an auxiliary wetting agent and a binder, and the affinity of the ceramic
slurry and the
polyolefin-based membrane is improved through an
alkane structure similar to the
polyolefin-based membrane in a molecular
chain segment of the amphiphilic
polymer wetting aid and hydroxyl capable of forming
hydrogen bonds with water molecules.