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Electrochemical performance of electrospun poly(vinylidene fluoride-co-hexafluoropropylene)-based nanocomposite polymer electrolytes incorporating ceramic fillers and room temperature ionic liquid

 

Prasanth Raghavana, Xiaohui Zhaoa, James Manuela, Ghanshyam S. Chauhana, Jou-HyeonAhna,, Ho-Suk Ryub, Hyo-Jun Ahnb, Ki-Won Kimb, Changwoon Nahc

 

(a) Department of Chemical and Biological Engineering and Engineering Research Institute, Gyeongsang National University, 900 Gajwa-dong, Jinju 660-701, Republic of Korea
(b) School of Nano and Advanced Materials Engineering and Engineering Research Institute, Gyeongsang National University, 900 Gajwa-dong, Jinju 660-701, Republic of Korea
(c) Department of Polymer-Nano Science and Technology, Chonbuk National University, 664-14 Duckjin-dong, Jeonju 561-756, Republic of Korea 

 

 Abstract

In view of the safety concerns and the requirements of high energy density lithium batteries, the room temperature ionic liquids (RTILs) are being investigated as suitable candidates to substitute organic electrolytes in polymer electrolytes. In this article, we report synthesis, characterization, and electrochemical properties of nanocomposite polymer electrolytes (NCPEs) comprising of a RTIL [n-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (BMITFSI)] and nano-sized ceramic fillers (SiO2, Al2O3 or BaTiO3) hosted in electrospun poly(vinylidene fluoride-co-hexafluoropropylene) [P(VdFHFP)] membranes. The addition of BMITFSI and ceramic fillers in polymer electrolytes results in high ionic conductivity at room temperature. The cells prepared with BMITFSI and different NCPEs show good interfacial stability and oxidation stability at >5.5V with the highest value of 6.0V for the NCPE incorporating BaTiO3. The cell with the NCPE containing BaTiO3 delivers high initial discharge capacity of 165.8mAh g−1, which corresponds to 97.5% utilization of active material under the test conditions, and showed the least % capacity fade after prolonged cycling.

 

Keywords: Lithium batteries, Composite polymer electrolytes, Electrospinning, Ceramic filler, Room temperature ionic liquid

 

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