Hun Lee and Mataz Alcoutlabi contributed equally to this work.
Polyvinylidene fluoride-co-chlorotrifluoroethylene and polyvinylidene fluoride-co-hexafluoropropylene nanofiber-coated polypropylene microporous battery separator membranes
Article first published online: 27 NOV 2012
Copyright © 2012 Wiley Periodicals, Inc.
Journal of Polymer Science Part B: Polymer Physics
Volume 51, Issue 5, pages 349–357, 1 March 2013
How to Cite
Lee, H., Alcoutlabi, M., Watson, J. V. and Zhang, X. (2013), Polyvinylidene fluoride-co-chlorotrifluoroethylene and polyvinylidene fluoride-co-hexafluoropropylene nanofiber-coated polypropylene microporous battery separator membranes. J. Polym. Sci. B Polym. Phys., 51: 349–357. doi: 10.1002/polb.23216
- Issue published online: 23 JAN 2013
- Article first published online: 27 NOV 2012
- Manuscript Accepted: 29 OCT 2012
- Manuscript Revised: 8 OCT 2012
- Manuscript Received: 13 SEP 2011
- Department of Energy. Grant Number: EE0002611-600
- Lithium-ion batteries;
Nanofiber-coated polypropylene (PP) separator membranes were prepared by coating a Celgard® microporous PP membrane with electrospun polyvinylidene fluoride-co-chlorotrifluoroethylene (PVDF-co-CTFE) and PVDF-co-CTFE/polyvinylidene fluoride-co-hexafluoropropylene (PVDF-co-HFP) nanofibers. Three PVDF polymer solutions of varying compositions were used in the preparation of the nanofiber coatings. Two of the polymer solutions were PVDF-co-CTFE blends made using different types of PVDF-co-HFP copolymers. The PVDF-co-CTFE and PVDF-co-CTFE/PVDF-co-HFP blend nanofiber coatings have been found to have comparable adhesion to the PP microporous membrane substrate. The electrolyte uptakes and separator–electrode adhesion properties of nanofiber-coated membranes were evaluated. Both the electrolyte uptake and the separator–electrode adhesion were improved by the nanofiber coatings. The improvement in electrolyte update capacity is not only related to the gelation capability of the PVDF copolymer nanofibers, but also attributed to the increased porosity and capillary effect on nanofibrous structure of the electrospun nanofiber coatings. Enhancement of the separator–electrode adhesion was owing to the adhesion properties of the copolymer nanofiber coatings. Compared with the PVDF-co-CTFE/PVDF-co-HFP blend nanofiber coatings studied, the PVDF-co-CTFE coating was more effective in improving the electrolyte uptake and separator–electrode adhesion. © 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2013