NOVELTY - The separation film comprises a porous non-woven fabric base material, and a porous coating layer with binder polymer for fixing and connecting between inorganic particles, where one side and pores of the base material are coated with inorganic particles. The porous non-woven fabric base material is made of composite fiber with a sheath part surrounding a core part. All or part of the sheath part and core part is fused and coupled to each other. The melting point of the core portion is 150 degrees C and is made of a high thermal-resistant polymer.    USE - The separation film is useful in an electrochemical device such as a lithium secondary battery (all claimed), a lithium metal secondary battery, a lithium-ion secondary battery and lithium polymer secondary battery or lithium-ion polymer secondary battery used in a fuel cell, a solar cell and a super-capacitor device.    ADVANTAGE - The separation film exhibits improved tensile strength, and improves thermal shrinkage resistance, stability and charging or discharging capability of the battery.    DETAILED DESCRIPTION - The separation film comprises a porous non-woven fabric base material, and a porous coating layer with binder polymer for fixing and connecting between inorganic particles, where one side and pores of the base material are coated with inorganic particles. The porous non-woven fabric base material is made of composite fiber with a sheath part surrounding a core part. All or part of the sheath part and core part is fused and coupled to each other. The melting point of the core portion is 150 degrees C and is made of a high thermal-resistant polymer. The porous non-woven substrate is made of low-thermal-resistant polymer with melting point of 50 degrees C. A cross section of the composite fiber is 70-90%. The porous non-woven fabric base material has a thickness of 9-30 mu m. The inorganic particle includes inorganic particle in which permittivity constant is greater than or equal to 5 and inorganic particle with lithium ion transfer capability. INDEPENDENT CLAIMS are included for:    (1) an electrochemical device; and    (2) a method for manufacturing the separation film.