Fluorinated Electrolytes for 5-V Li-Ion Chemistry: Synthesis and Evaluation of an Additive for High-Voltage LiNi0.5Mn1.5O4/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 LiNi0.5Mn1.5O4/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 Xray 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 LiNi0.5Mn1.5O4/graphite cell at elevated temperature. (C) 2014 The Electrochemical Society. All rights reserved.