Pyrrolidinium and Imidazolium-Based Ionic Liquids as Electrolytes for Na0.67Ni0.33Mn0.67O2 Positive Electrode for Sodium–Ion Batteries
Leandro S. Domingues, Roberto M. Torresi, Vincent Vivier, Mireille Turmine, Vitor L. Martins, Hercilio G. de Melo
TL;DR
This study compares pyrrolidinium and imidazolium-based ionic liquids as electrolytes for sodium-ion batteries, finding that they perform worse than traditional electrolytes but can still be improved at lower current densities.
Contribution
The novel contribution is the evaluation of two specific ionic liquids with varying NaTFSI concentrations for their suitability in sodium-ion battery systems.
Findings
BMPyr-TFSI showed better transport properties than BMMI-TFSI in neat ionic liquid form.
Adding NaTFSI salt reduced the performance of both ionic liquids compared to carbonate electrolytes.
Lower current densities improved performance, achieving over 53 mA h g–1 and 96% Coulombic efficiency at C/50.
Abstract
In this paper, the electrochemical performance of two nitrogen-based ionic liquids (ILs), 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide (BMPyr-TFSI) and 2,3-dimethylimidazolium bis(trifluoromethylsulfonyl)imide (BMMI-TFSI), with different concentrations of NaTFSI, as electrolytes for the Na0.67Ni0.33Mn0.67O2 (NNM) positive electrode for sodium–ion batteries (SIBs) were compared with the conventional 1.0 mol L–1 NaClO4 in carbonate electrolyte. Moreover, the influence of salt concentration on the physicochemical properties of both ILs was evaluated. Amidst the neat ILs, BMPyr-TFSI showed better transport properties than BMMI-TFSI, whereas, for NaTFSI-mixtures, adding salt was detrimental to the ILs’ properties. The poorer transport properties of the ILs compared to those of the carbonate electrolyte negatively impact the NNM electrode performance. At C/10, the…
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Taxonomy
TopicsAdvancements in Battery Materials · Advanced Battery Materials and Technologies · Thermal Expansion and Ionic Conductivity