BATTERY SUBSTRATE FOR SEPARATING POSITIVE ELECTRODE AND NEGATIVE ELECTRODE FROM EACH OTHER IN RECHARGEABLE BATTERY, AND RECHARGEABLE BATTERY COMPRISING SAME

A battery substrate for separating a positive electrode and a negative electrode from each other in a rechargeable battery includes a porous substrate having a first surface and a second surface opposing each other and a first coating layer and a second coating layer respectively disposed on the first and second surfaces of the porous substrate. Each of the first and second coating layers contains heat-resistant organic particles, an organic heat-resistant binder, and an organic adhesive binder. The heat-resistant organic particles have a core/shell structure.