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Polymer electrolyte membranes composed of an electrospun poly(vinylidene fluoride) fibrous mat in a poly(4‐vinylpyridine) matrix |
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| Authors: | Changwoon Nah Kwang‐Un Jeong Youn‐Sik Lee Soo‐Hyoung Lee Mohamed Mustafa Abdul Kader Hong Ki Lee Jou‐Hyeon Ahn |
| Affiliation: | 1. BK‐21 Polymer BIN Fusion Research Team, Department of Polymer‐Nano Science and Technology, Chonbuk National University, 664‐14 Duckjin‐dong, Duckjin‐gu, Jeonju, Chonbuk 561‐756, South Korea;2. School of Semiconductors and Chemical Engineering, Chonbuk National University, 664‐14 Duckjin‐dong, Duckjin‐gu, Jeonju 561‐756, South Korea;3. Department of Plastics Engineering, Central Institute of Plastics Engineering and Technology, B‐25, CNI Complex, Patia, Bhubaneswar—751 024, Orissa, India;4. Fuel Cell Regional Innovation Center, Woosuk University, Chonbuk 565‐701, South Korea;5. Department of Chemical and Biological Engineering and Engineering Research Institute, Gyeongsang National University, 900 Gajwa‐dong, Jinju 660‐701, South Korea |
| Abstract: | Newly proposed polymer electrolyte membranes (PEMs) composed of an electrospun poly(vinylidene fluoride) (PVDF) fibrous mat embedded in a poly(4‐vinylpyridine) (P4VP) matrix were successfully fabricated in order to improve the mechanical and dimensional stabilities and ionic conductivity of membranes in lithium rechargeable batteries. Fourier transform infrared spectroscopic analysis showed that as a result of the use of a high voltage during electrospinning the crystalline structure of PVDF changed partially from α‐phase to β‐phase. Energy‐dispersive X‐ray spectroscopy confirmed the existence of crosslinked P4VP in the PVDF fibrous mat. The electrolyte uptakes of PVDF and PVDF/P4VP composite mats were higher than that of PVDF cast film. The tensile properties of PVDF/P4VP composite mat were considerably improved compared to those of the pristine PVDF fibrous mat under both dry and wet (soaked with electrolyte) conditions. In addition, the mechanical and dimensional stabilities of the PVDF/P4VP composite PEM were further enhanced due to crosslinking between the P4VP chains. Furthermore, the PVDF/P4VP composite PEM exhibited an ionic conductivity that was an order of magnitude higher than that of traditional PVDF film. © 2012 Society of Chemical Industry |
| Keywords: | polymer electrolyte electrospun mat poly(vinylidene fluoride) poly(4‐vinylpyridine) secondary lithium battery ionic conductivity |