Abstract
In this manuscript is reported a thermal and impedance spectroscopy investigation carried out on quaternary polymer electrolytes, to be addressed as separators for lithium solid polymer batteries, containing large amount of the N-methyl-N-propylpyrrolidinium bis(fluorosulfonyl)imide ionic liquid. The target is the development of Li+ conducting membranes with enhanced ion transport even below room temperature. Polyethylene oxide and polymethyl methacrylate were selected as the polymeric hosts. A fully dry, solvent-free procedure was followed for the preparation of the polymer electrolytes, which were seen to be self-consistent and handled even upon prolonged storage periods (more than 1 year). Appealing ionic conductivities were observed especially for the PEO electrolytes, i.e., 1.6 × 10−3 and 1.5 × 10−4 S cm−1 were reached at 20 and −20°C, respectively, which are ones the best, if not the best ion conduction, never detected for polymer electrolytes.
Highlights
In the last years it was successfully demonstrated[6] that incorporation of N-alkyl-N-methylpyrrolidinium (PYR1A, where the subscripts indicate the number of carbon atoms of the pyrrolidinium cation alkyl chains) perfluorosulfonylimide (PFSI) ionic liquids (ILs) enhances the room temperature ionic conductivity of solid polymer electrolytes (SPEs) above 10−4 Scm−1 and improves the compatibility with respect to the lithium anode
In the frame of the MARS-EV project[7] we have properly designed and developed SPEs based on polyethylene oxide- (PEO) and polymethyl methacrylate (PMMA), i.e., considered ones of the most suitable materials as host for polymer electrolytes,[6] and incorporating large fraction of N-methyl-N-propylpyrrolidinium bis(fluorosulfonyl)imide, PYR13FSI
It is worth to note that a conductivity increase of one order of magnitude, with respect to the IL-free PEO sample, is seen even at medium-high temperatures to results previously reported in literature.[6]
Summary
Soc. 164 A6213 View the article online for updates and enhancements This content was downloaded from IP address 151.27.76.205 on 10/04/2020 at 08:03. The PEO and PMMA quaternary electrolyte samples were investigated, as a function of the IL content and temperature, in terms of thermal and ion transport properties. The (PYR13)+:Li+ mole ratio was ranged from 0 to 7 whereas the EC content was fixed to 8 wt% (7.4 wt% of the overall sample weight) with respect to the PEO(PMMA)-LiTFSI-PYR13FSI mass. The so-assembled cells were housed in sealed pouch envelopes and, successively, laminated twice by hot-rolling at 100◦C to improve the electrolyte/electrode interfacial contact
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