Characterization and properties of ternary P(VdF-HFP)-LiTFSI-EMITFSI ionic liquid polymer electrolytes |
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| Institution: | 1. School of Chemical Engineering and Technology, Harbin Institute of Technology, No.92, West Da-Zhi Street, Harbin 150001, People’s Republic of China;2. School of Chemical and Environmental Engineering, Harbin University of Science and Technology, No.4 Lin Yuan Road, Harbin 150040, People’s Republic of China;1. INM - Leibniz Institute for New Materials, 66123, Saarbrücken, Germany;2. Department of Materials Science and Engineering, Saarland University, 66123, Saarbrücken, Germany;3. Robert Bosch GmbH, Robert-Bosch-Campus 1, 71272, Renningen, Germany;1. Department of Applied Physics, Chalmers University of Technology, SE-41296 Göteborg, Sweden;2. University of Rome La Sapienza, P.le Aldo Moro 5, 00185 Rome, Italy;1. ENEA, Agency for New Technologies, Energy and Sustainable Economic Development, SSPT-PROMAS-MATPRO, Via Anguillarese 301, Rome, 00123, Italy;2. Helmholtz Institute Ulm - Karlsruhe Institute of Technology, Helmholtzstrasse 11, 89081, Ulm, Germany;3. Karlsruhe Institute of Technology (KIT), P.O. Box 3640, 76021, Karlsruhe, Germany;1. Energy Engineering, Division of Energy Science, Luleå University of Technology, Luleå, 97187, Sweden;2. Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China;3. Sustainable Chemistry, Faculty of Technology, University of Oulu, Oulu, 90570, Finland |
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| Abstract: | Gel polymer electrolytes containing 1-ethyl-3-methylimidazolium-bis (trifluoromethyl-sulfnyl)imide (EMITFSI) ionic liquid were prepared for lithium ion batteries by solution casting method. Thermal and electrochemical properties have been determined for the gel polymer electrolytes. Proper addition of EMITFSI to the P(VdF-HFP)-LiTFSI polymer electrolyte improves the ionic conductivity and electrochemical window to 2.11 × 10−3 S cm−1 (30 °C) and 4.6 V. In combination of the prepared ternary P(VdF-HFP)-LiTFSI-EMITFSI ionic liquid polymer electrolytes, Li4Ti5O12 anode exhibited two extra voltage plateaus around 1.1 V and 2.3 V except the typical voltage plateau around 1.6 V by possible side reaction between ionic liquid and polymer. LiFePO4 cathode exhibited high capacity above 140 mA h g−1 and retention of 93.1% due to the suppressed polarization effect caused by enhanced ion transport properties. The high temperature of 80 °C didn't have significant impact on the cycling performance. |
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