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

Manfred Kerner (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; Nareerat Plylahan (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; Johan Scheers (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; Patrik Johansson (Institutionen för teknisk fysik, Kondenserade materiens fysik)
Physical Chemistry Chemical Physics (1463-9076). Vol. 17 (2015), 29, p. 19569-19581.
[Artikel, refereegranskad vetenskaplig]

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 LiTFSI0.2EMIFSI0.8 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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Denna post skapades 2015-07-27. Senast ändrad 2016-09-14.
CPL Pubid: 219988

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Kondenserade materiens fysik (1900-2015)

Ämnesområden

Energi
Materialvetenskap
Transport
Den kondenserade materiens fysik

Chalmers infrastruktur

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Denna publikation ingår i:


Ionic Liquid Based Electrolytes for High-Temperature Lithium-Ion Batteries