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

A porous polyimide (PI) membrane is successfully prepared via nonsolvent-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 the commercial polyethy...

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Veröffentlicht in:ACS applied materials & interfaces 2020-01, Vol.12 (3), p.3610-3616
Hauptverfasser: Li, Manni, Zhang, Zhoujie, Yin, Yuting, Guo, Weichang, Bai, Yuge, Zhang, Fan, Zhao, Bin, Shen, Fei, Han, Xiaogang
Format: Artikel
Sprache:eng
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Zusammenfassung:A porous polyimide (PI) membrane is successfully prepared via nonsolvent-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 the commercial polyethylene (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 °C for 1 h, while the cells with the commercial PE separator could not charge any more due to the shrinkage of the PE under the same condition.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.9b19049