Fluorinated Electrolytes for 5-V Li-Ion Chemistry: Synthesis and Evaluation of an Additive for High-Voltage LiNi_0.5Mn_1.5O₄/Graphite Cell

A fluorinated carbonate compound was identified as an electrolyte additive capable of stabilizing the new fluorinated electrolyte/electrode interphase in a high-voltage spinel LiNi 0.5 Mn 1.5 O 4 /graphite cell. The synthesis and characterization of the additive are described, and the electrochemical performance and post-analysis using scanning electron microscopy and energy dispersive X-ray spectrometry revealed that this additive actively participates in passivation formation on the graphite anode, making it an effective additive for enabling all-fluorinated electrolytes supporting reversible Li + intercalation chemistry in a LiNi 0.5 Mn 1.5 O 4 /graphite cell at elevated temperature.