| abstract |
The organic / inorganic composite separation membrane of the present invention comprises: (a) a polyolefin-based porous base material having a large number of pores; and (b) at least one surface of the porous base material coated with a large number of inorganic particles and a binder polymer. An organic / inorganic composite separation membrane comprising a porous active layer formed of a mixture with the porous active layer having a peeling force of 5 gf / cm or more, and the organic / inorganic composite separation membrane at 150 ° C. The thermal shrinkage after standing for 1 hour is 50% or less in the machine direction (MD, Machine Direction) or perpendicular direction (TD, Transverse Direction). The organic / inorganic composite separation membrane according to the present invention not only improves the problem of detachment of inorganic particles in the porous active layer coated on the porous substrate during the assembly process of the electrochemical element, but also improves the electrochemical element. Even when is heated, a short circuit between the positive electrode and the negative electrode can be suppressed. |