Composition for forming heat-resistant porous layer, separation film including heat resistant porous layer, electrochemical cell using separation film, and manufacturing method of separation film

摘要

PROBLEM TO BE SOLVED: To provide: a separation film which can retain its own form rather than bursts even under an environment such that the temperature in a battery is raised to 200°C or higher in several seconds, and which has a good adhesive force; and an electrochemical battery arranged by use of such a separation film.SOLUTION: An electrochemical battery separation film and an electrochemical battery are provided. The separation film comprises: a porous base material; and a heat resistant porous layer formed on one or each face of the porous base material. In the separation film, the heat resistant porous layer includes a crosslink type binder. The separation film has a tensile strength of 50-350 kgf/cmafter left at 200°C for 10 minutes.SELECTED DRAWING: Figure 1