Journal
CHEMICAL ENGINEERING JOURNAL
Volume 378, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.122245
Keywords
Ion gel polymer electrolytes; Polymeric ionic liquids; Lithium metal batteries; Flexible electrolyte membranes
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Funding
- Municipal Natural Science Foundation of Shanghai [14ZR1414700]
- Professional and Technical Service Platform for Designing and Manufacturing of Advanced Composite Materials (Shanghai), Shanghai Municipal Science and Technology Commission [16DZ2292100, 19DZ2293100]
- Shanghai Engineering Research Center of New Materials and Application for Resources and Environment [18DZ2281400]
- Engineering Research Center of Material Composition and Advanced Dispersion Technology, Ministry of Education, Municipal Education Commission (Peak Discipline Construction Program)
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In this work, the free-standing ion gel polymer electrolytes (IGPEs) membranes have been successfully prepared by in situ polymerization of N-Vinyl-3-butyl imidazole bis(trifluoromethylsulfonyl) imide (VBImTFSI) and poly (ethylene glycol) methacrylate (PEGMA) in the presence of 1-butyl-3-methylimidazolium bis-(trifluoromethylsulfonyl) imide ([BMIM]TFSI) and a small amount of a cross-linker, with/without lithium salt. The obtained semitransparent and flexible IGPEs membranes exhibit good thermal stability and mechanical strength. The ionic conductivity is improved with increasing ionic liquid content and with the addition of lithium salt and the ionic conductivity is up to 2.11 x 10(-4) S cm(-1) at room temperature. The IGPEs containing LiTFSI exhibit wide electrochemical stability up to 4.9 V versus Li+/Li, and a superior lithium-ion transference number (t(Li+)) of 0.83. In addition, Li/LiFePO4 half cells assembled with the optimized IGPEs exhibit high charge/discharge efficiency and stable cycle performance at C/10 rate, delivering a discharge capacity of 142.2 mA h g(-1) with stable coulombic efficiency (100%) after 100 cycles.
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