Locally Concentrated Ionic Liquid Electrolytes for High-Energy Batteries
Xu Liu,a,b Cheng Xu, a,b and Stefano Passerini a,b
a Helmholtz Institute Ulm (HIU), Helmholtzstraße 11, D-89081 Ulm, Germany
b Karlsruhe Institute of Technology (KIT) P.O. Box 3640, D-76021 Karlsruhe, Germany
E-mail: stefano.passerini@kit.edu
Non-flammable ionic liquid electrolytes (ILEs) are well-known candidates for safer and long-lifespan lithium metal batteries (LMBs). However, the high viscosity and insufficient Li+ transport limit their practical application. Recently, non-solvating and low-viscosity co-solvents diluting ILEs without affecting the local Li+ solvation structure are employed to solve these problems. The diluted electrolytes, i.e., locally concentrated ionic liquid electrolytes (LCILEs), exhibiting lower viscosity, faster Li+ transport, and enhanced compatibility toward lithium metal anodes, are feasible options for the next-generation high-energy-density LMBs. In the presentation, the progress of the recently developed LCILEs are summarised, including their physicochemical properties, solution structures, and applications in LMBs with a variety of high-energy cathode materials. Lastly, a perspective on the future research directions of LCILEs will be given as well as the most recent results on Li and post-Li metal anode cells.
References
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