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Role of organic solvent addition to ionic liquid electrolytes for lithium-sulphur batteries

Shizhao Xiong (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; Johan Scheers (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; Luis Antonio Aguilera Medina (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; Du Hyun Lim (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; K. Xie ; Per Jacobsson (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; Aleksandar Matic (Institutionen för teknisk fysik, Kondenserade materiens fysik)
RSC Advances (2046-2069). Vol. 5 (2015), 3, p. 2122-2128.
[Artikel, refereegranskad vetenskaplig]

We investigate the role of the addition of an organic solvent to an ionic liquid electrolyte for the performance of lithium-sulphur (Li-S) batteries. We find that with a mixed electrolyte, formed by adding 10 wt% 1,3-dioxolane (DIOX) to an ionic liquid, the capacity of a Li-S cell is more than doubled, the rate capability and the cycling performance considerably improved, compared to a cell utilizing a neat ionic liquid electrolyte. The improved performance can be correlated with an enhanced ion transport, evidenced by an increased ionic conductivity and higher limiting current density, directly related to a decrease in viscosity and glass transition temperature of the mixed electrolytes. We show that this in turn is linked to a change in the local environment of the Li-ions where the organic solvent is incorporated in the coordination shell. In addition we show that the mixed electrolytes have a considerably higher thermal stability, in particular a dramatically increased flash point, and improved low temperature properties with respect to a conventional organic solvent based electrolyte currently used for Li-S batteries.



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Denna post skapades 2015-01-08. Senast ändrad 2016-09-14.
CPL Pubid: 210302

 

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

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Materialvetenskap
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Chalmers infrastruktur