Review—recent advances in non-aqueous liquid electrolytes containing fluorinated compounds for high energy density lithium-ion batteries

Fluorinated compounds have received a huge amount of attention in non-aqueous liquid electrolytes for lithium-ion batteries (LIBs) because they possess desirable properties, such as high oxidation stability, high flash point, low melting point, good wettability with separator and electrode, along with easy to form a compact and stable interphase layer between electrode and electrolyte. According to different functions of fluorinated compounds, including additives, co-solvents and diluents, this review summarizes the latest research progress of these fluorinated compounds used in high energy density lithium-ion batteries. Notably, these high energy density lithium-ion batteries use high voltage/capacity positive electrodes coupled with negative electrodes such as graphite, Si-based negative electrodes, even Li metal electrodes. We spotlight high-voltage functional fluorinated compounds used in the batteries assembled with high energy density positive electrodes rather than common positive electrodes. We believe that this review will help researchers easily identify and understand the fluorinated compounds suitable for the next generation of high energy density electrolyte systems.