“…PVDF-BT was chosen for its good pyroelectric response, high chemical resistance, and ease of fabrication as a flexible, porous film. Electrically poled PVDF-BT films used in this work have a measured pyroelectric coefficient of 59 mC m À2 K À1 18. When heated, both the Celgard films and the unpoled PVDF-BT films employed as control separators show a lack of pyroelectric response (ESI, † TableS2).…”