Reaction Mechanisms of the Degradation of Fluoroethylene Carbonate, an Additive of Lithium?Ion Batteries, Unraveled by Radiation Chemistry

Numerous additives are used in the electrolytes of lithium-ion batteries, especially for formation an efficient solid electrolyte interphase at surface electrodes. Understanding degradation processes these compounds is thus important; they can be seen through radiolysis. In case fluoroethylene carbonate (FEC), picosecond pulse radiolysis experiments evidenced FEC.- . This radical stabilized neat FEC, whereas ring opens to form more stable anions when FEC a solute other solvents, as confirmed by quantum chemistry calculations. pre-solvated electrons primarily undergo attachment rather than solvation. On long timescales, gases produced (H2 , CO, and CO2 ) were quantified. A reaction scheme both oxidizing reducing pathways stake irradiated proposed. work shows that nature primary species formed depends on amount solution.