The most important advantages of lithium ion batteries (LIBs) are their high energy-to-weight-ratio, lack of memory effect and low discharge when not in use. This makes them the energy source of choice for many applications in consumer electronics. However, over the past years serious problems occurred as a consequence of short-circuit currents which led to overheating and ignition of the organic solvents used in the formulation of the electrolytes. Therefore, new types of electrolytes are currently under investigation worldwide. Important requirements for the electrolytes include large electrochemical stabilities and sufficient to good conductivities as well as low viscosities. Many ionic liquids (ILs) � salts that are liquid at temperatures below 100�C � show very large electrochemical, chemical and thermal stabilities. In addition, they are incombustible at temperatures below their decomposition point. Together with their tunable viscosities and conductivities this makes them to promising substances for safe electrolytes in batteries. In this presentation we will report on our recent developments in the field of electrolytes for LiBs based on ionic liquids. The focus of this talk will be the tunability of the viscosity and the conductivity by using pure ionic liquids with different functionalities, mixtures of ionic liquids and additives. We will also put some light on their ability to dissolve lithium-salts.

Novel electrolytes for lithium-ion batteries

243rd National Meeting (2012)

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