Energy-dense batteries are required for the electric revolution in transport. Lithium-based batteries such as Li-ion and lithium metal both play an important role in this transition. However, carbonate-based electrolytes are often the electrolyte of choice for these chemistries despite their modest thermal stability for Li-ion and their poor electrochemical stability and Coulombic efficiencies for Lithium metal. Here, we synthesize a group of novel fluoroether electrolytes that combine the oxidative stability and passivation behavior of fluorinated moieties with the ionic conductivity of ether groups. Firstly, we probe their ion solvation behavior. Secondly, we show that they improve long term lithium metal battery cycling when compared to commercial carbonate electrolytes. Finally, we explore them with graphitic anodes for Li-ion batteries and they show the ability to suppress undesired solvent co-intercalation commonly observed for conventional glyme electrolytes. Novel electrolyte synthesis and characterization provides the opportunity to solve challenges facing a myriad of battery chemistries and accelerate the decarbonization efforts.

Novel electrolyte design for lithium-based batteries

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ACS Fall 2022

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