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Ionic liquid based electrolytes for sodium-ion batteries: Na+ solvation and ionic conductivity

Damien Monti (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; Erlendur Jónsson (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; M. Rosa Palacin ; Patrik Johansson (Institutionen för teknisk fysik, Kondenserade materiens fysik)
Journal of Power Sources (0378-7753). Vol. 245 (2014), p. 630-636.
[Artikel, refereegranskad vetenskaplig]

Ionic liquid (IL) based sodium-ion (Na+) battery electrolytes obtained by mixing imidazolium-TFSI ILs (EMIm-TFSI and BMIm-TFSI) with the corresponding sodium salt (NaTFSI) have been investigated using a wide range of characterization techniques: dielectric spectroscopy, differential scanning calorimetry, densitometry, viscometry, and Raman spectroscopy. The sodium ion conducting electrolytes exhibit excellent ionic conductivities, up to 5.5 mS cm(-1) at room temperature, and a useful thermal window of -86 degrees C to 150 degrees C. In more detail, Raman data analysis supported by DFT calculations on Na+-TFSI complexes, allow us to determine the sodium ion solvation and charge carrier nature as a function of salt concentration. The results are compared to data for the corresponding Li systems and while such electrolytes essentially form [Li(TFSI)(2)](-) as the main Li+ carrier, the sodium systems seem to dominantly form [Na(TFSI)(3)](2-) complexes. The effects on conductivity and viscosity and the consequences for sodium-ion battery implementation are discussed. (C) 2013 Elsevier B.V. All rights reserved.

Nyckelord: Sodium-ion battery, Ionic liquid, Bis(trifluoromethylsulfonyl)imide, Electrolytes, Raman spectroscopy, Imidazolium



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Denna post skapades 2013-11-11. Senast ändrad 2014-12-09.
CPL Pubid: 186342

 

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Institutioner (Chalmers)

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

Ämnesområden

Energi
Materialvetenskap
Transport
Elektrokemi

Chalmers infrastruktur

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