Abstract
Three ionic plastic crystalline solids were synthesized and analyzed to evaluate their suitability for use as electrolytes in Li-ion batteries: N-propyl-N-methylpiperidinium hexafluorophosphate (PP13PF6), N-propyl-N-methylpiperidinium tetrafluoroborate (PP13BF4) and piperidinium perchlorate (PPClO4). The physical and electro(chemical) properties will be discussed.Voltammetric analysis of the plastic crystals alone showed very wide electrochemical windows (>7.5 V) for PP13PF6 and PP13BF4, and a relatively wide window for PPClO4 (4V). Addition of the analogous lithium salts to each of these species (LiPF6, LiBF4 and LiClO4) in a 50:50 wt% ratio showed sluggish Li+ transport at room temperature, but improved when heated to temperatures greater than 45 °C. However, addition of 20 wt% of EC/DEC solvent increased Li+ transport dramatically, particularly for PP13PF6 and PP13BF4. Overall, a mixture containing LiBF4, PP13BF4 and EC/DEC displayed a stable wide electrochemical window of activity for several cycles and good Li+transport through the electrolyte rendering it a promising mixture for future use in Li-ion batteries.
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