Journal
JOURNAL OF POWER SOURCES
Volume 178, Issue 2, Pages 815-820Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2007.08.063
Keywords
polymer electrolyte; electrospinning; room temperature ionic liquid; poly(vinylidene fluoride-co-hexafluoropropylene); lithium batteries
Funding
- National IT Industry Promotion Agency (NIPA), Republic of Korea [C1090-0801-0023] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [핵C6B1307] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Poly(vinylidene fluoride-co-hexafluoropropylene) {P(VdF-HFP)} membranes incorporating 0, 6 and 10wt.% of nano-meter sized particles of SiO2 were prepared by electrospinning. These membranes served as host matrix for the preparation of polymer electrolytes (PEs) by activating with the non-volatile and safe room temperature ionic liquid (RTIL), 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonylimide) (BMITFSI). The membranes consisted of layers of fibers with average fiber diameter of 2-5 mu m and had a porosity of similar to 87%. PEs with SiO2 exhibited higher ionic conductivity with a maximum of 4.3 x 10(-3) S cm(-1) at 25 degrees C obtained with 6% SiO2. The optimum PE based on the membrane with 6% SiO2 exhibited better compatibility with lithium metal electrode on storage and resulted in enhanced charge-discharge performance in Li/LiFePO4 cells at room temperature, delivering the theoretical specific capacity of 170 mAh g(-1) at 0.1 C-rate. The PEs exhibited a very stable cycle property as well, demonstrating their suitability for lithium battery applications. (C) 2007 Elsevier B.V. All rights reserved.
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