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Geminal Pyrrolidinium and Piperidinium Dicationic Ionic Liquid Electrolytes. Synthesis, Characterization and Cell Performance in LiMn2O4 Rechargeable Lithium Batteries

AuthorsHerradón García, Bernardo ; Mann, Enrique ; Morales, E. ; Río, Carmen del ; Vélez, J. F.; Vazquez-Santos, Maria B.; Amarilla, José Manuel
Issue Date12-May-2019
AbstractRechargeable lithium-ion batteries are excellent candidates for the next generation power sources because of their high gravimetric and volumetric energy compared to other cell chemistries. Conventional LIB¿s, based on organic carbonate liquid electrolytes, suffer from potential thermal and chemical threats associated with the thermal runaway hazard, low thermal stability, low flash points, toxicity, high volatility and flammability. Aprotic ionic liquids, represent a safe alternative to organic carbonates, due to their negligible vapor pressure, wide liquid range, high thermal stability, non-flammability, high ionic conductivity and wide electrochemical stability window. However, problems associated to their high viscosity, especially when lithium salts have been added, low stability of the solid electrolyte interphase (SEI), and high cost need to be solved. In this work, we report on the synthesis and characterization of a series of novel room temperature dicationic ionic liquid electrolytes, based on pyrrolidinium and piperidinium cation moieties linked by short oligo(ethylene glycol) chains. Electrochemical performance of Li-half cells assembled using LiMn2O4 spinel (LMO) as cathode material and 1M LiTFSI doped dicationic ionic liquid electrolytes have been tested. Results obtained indicate that the length of the oligo(ethylene glycol) chain has a crucial role in the properties of the ionic liquids; in fact, both pyrrolidinium and piperidinium ionic liquids linked by short chains are crystalline solids, while increasing the spacer chain lead to liquid samples. Regarding electrolytes, the highest ionic conductivity (¿ 10-4 S cm-1 at room temperature) was obtained for the pyrrolidinium-based ionic liquid electrolyte with the intermediate length chain length spacer. It has to be pointed out that all electrolytes have a high potential electrochemical stability. Another noticeable data is that cell performance is not only controlled by electrolyte ionic conductivity, but other magnitudes, such as interactions taking place between the ionic species of the electrolyte, modify the Li+ ion diffusion, and so the kinetics of the insertion/deinsertion process, in good agreement with previous data [1].
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(IQOG) Comunicaciones congresos
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