| 摘要 |
The present invention refers to a method of preparing a separator, comprising: producing a dispersion comprising inorganic particles, a polymer binder, polymer fibers and a solvent; applying the dispersion on the top surface of a substrate to form a non-woven fabric web as a layer comprising the inorganic particles, the polymer binder and the polymer fiber, in which the inorganic particles are positioned in gaps of the polymer fibers and adhered thereto by the polymer binder; and drying and compressing the non-woven fabric web to obtain a non-woven fabric substrate; a separator prepared by the method; and an electrochemical device comprising the separator. In the method of the present invention, micro-sized pores present in a conventional non-woven fabric substrate are sufficiently filled with inorganic particles and a polymer binder to control the pore size on a nanometer scale, thereby inhibiting the generation of a leak current and thus preventing the insulating property of electrochemical devices using the separator from being deteriorated. Also, the filling of the inorganic particles in the pores of the non-woven fabric substrate made of polymer fibers can increase the mechanical strength of the separator. |
