Novel Polyimide Separator Prepared with Two Porogens for Safe Lithium Ion Batteries.

Abstract

A porous polyimide (PI) membrane is successfully prepared via non-solvent induced phase separation with two porogens, dibutyl-phthalate and glycerin. The as-prepared uniform porous PI membrane shows excellent separator properties for lithium ion batteries (LIBs). Compared with commercial PE separator, the PI separator exhibits significant thermal stability, better ionic conductivity and wettability both in carbonate and ether electrolytes for LIBs. The battery coin-cells assembled with the PI separator is more robust, and still works even after heating at 140 ℃ for 1 hour, while the cells with the commercial PE separator could not charge any more due to the shrinkage of the PE under the same condition.