NON-WOVEN FABRIC AND PREPARATION METHOD THEREFOR, LITHIUM BATTERY DIAPHRAGM AND LITHIUM BATTERY DIAPHRAGM BASE MEMBRANE

A non-woven fabric and a preparation method therefor, a lithium battery diaphragm and a lithium battery diaphragm base membrane, relating to the field of materials. Raw materials of the non-woven fabric comprise main fibers and bonding fibers, wherein the bonding fibers comprise first bonding fibers and second bonding fibers; the melting point or softening point of the first bonding fibers is 120-220°C, and the melting point or softening point of the second bonding fibers is 100-170°C, the melting point or softening point of the second bonding fibers is at least 15°C lower than that of the first bonding fibers; and the melting point or softening point of the main fibers is at least 20°C higher than that of the first bonding fibers. The surface of the non-woven fabric is provided with a fine concave-convex structure, so that when the surface of the non-woven fabric is coated, the concave-convex structure of the non-woven fabric can improve the adhesiveness of the non-woven fabric, improve the infiltration capacity of coating slurry on the surface of the non-woven fabric, increase the contact area between the coating slurry and the non-woven fabric, and enable the surfaces of the coating slurry and the non-woven fabric to be mutually inlaid to generate an meshing force and achieve the effect of strong bonding.