Li-metal batteries have known a continuous development since the introduction of PEO based electrolytes [1]. The coming on the market in 2012 of a Li-metal polymer powered car with 250 km driving range (BlueCar) has confirmed the possibility to implement lithium metal batteries in the market. Moreover, most of the ‘next generation’ batteries such as Li-S or Li-air are based on Li-metal negative electrodes. If the present Li-metal electrolytes are based on polymer electrolytes, ionic liquids (ILs) based electrolytes such as LiFSI-PYR₁₄FSI [2] or crosslinked PEO-PYR₁₄TFSI-LiTFSI [3] have demonstrated very reversible lithium plating/stripping.

IL-based electrolytes are also showing promising performance in novel energy storage systems such as Na/seawater batteries [4].

A review of our results on the use of ionic liquid-based electrolytes for lithium, sodium, and multivalent cations will be presented.

Acknowledgement:

This work is supported by the European Commission within the projects LABOHR and INFLUENCE and the Helmholtz Gemeinschaft within the project “Helmholtz-Energie-Allianz - Stationaere elektrochemische Feststoff -Speicher und –Wandler” (HA-E-0002).

References :

1. M. Armand, M. Duclot, J. M. Chabagno, EU 00013199

2. E. Paillard, Q. Zhou, W. A. Henderson, G. B. Appetecchi, M. Montanino and S.Passerini, J. Electrochem. Soc. 156 (11) (2009) 891-895

3. G.T. Kim, G.B. Appetecchi, M. Carewska, M. Joost, A. Balducci, M. Winter, S. Passerini, J. Power Sources 195 (2010) 6130–6137

4. J.-K. Kim et al, NPG Asia Materials 6 (2014) e144.