Ionic liquid based lithium battery electrolytes: fundamental benefits of utilising both TFSI and FSI anions?

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Abstract

Synergetic effects of FSI–TFSI mixed electrolytes?

Abstract

Several IL based electrolytes with an imidazolium cation (EMI) have been investigated trying to elucidate a possible beneficial effect of mixing FSI and TFSI anions in terms of physico-chemical properties and especially Li ⁺ solvation. All electrolytes were evaluated in terms of phase transitions, densities and viscosities, thermal stabilities, ionic conductivities and local structure, i.e. charge carriers. The electrolytes with up to 20% of Li-salts showed to be promising for high temperature lithium ion battery application ( ca. 100 °C) and a synergetic effect of having mixed anions is discernible with the LiTFSI _0.2EMIFSI _0.8 electrolyte giving the best overall performance. The determination of the charge carriers revealed the SN to be ca. 2 for all analysed electrolytes, and proved the analysis of the mixed anion electrolytes to be challenging and inherently leads to an ambiguous picture of the Li ⁺ solvation.

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Quantum Calculation of Molecular Energies and Energy Gradients in Solution by a Conductor Solvent Model

Vincenzo Barone, Maurizio Cossi (1998)

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Ionic-liquid materials for the electrochemical challenges of the future.

Michel Armand, Frank Endres, Douglas MacFarlane … (2009)

Ionic liquids are room-temperature molten salts, composed mostly of organic ions that may undergo almost unlimited structural variations. This review covers the newest aspects of ionic liquids in applications where their ion conductivity is exploited; as electrochemical solvents for metal/semiconductor electrodeposition, and as batteries and fuel cells where conventional media, organic solvents (in batteries) or water (in polymer-electrolyte-membrane fuel cells), fail. Biology and biomimetic processes in ionic liquids are also discussed. In these decidedly different materials, some enzymes show activity that is not exhibited in more traditional systems, creating huge potential for bioinspired catalysis and biofuel cells. Our goal in this review is to survey the recent key developments and issues within ionic-liquid research in these areas. As well as informing materials scientists, we hope to generate interest in the wider community and encourage others to make use of ionic liquids in tackling scientific challenges.