Role of organic solvent addition to ionic liquid electrolytes for lithium-sulphur batteries
Journal article, 2015

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.

Author

Shizhao Xiong

Chalmers, Applied Physics, Condensed Matter Physics

Johan Scheers

Chalmers, Applied Physics, Condensed Matter Physics

Luis Aguilera Medina

Chalmers, Applied Physics, Condensed Matter Physics

Du Hyun Lim

Chalmers, Applied Physics, Condensed Matter Physics

K Xie

National University of Defense Technology

Per Jacobsson

Chalmers, Applied Physics, Condensed Matter Physics

Aleksandar Matic

Chalmers, Applied Physics, Condensed Matter Physics

RSC Advances

2046-2069 (ISSN)

Vol. 5 3 2122-2128

Areas of Advance

Energy

Materials Science

Subject Categories

Chemical Sciences

DOI

10.1039/c4ra14824j

More information

Created

10/8/2017