Reactivity of Electrolyte with the Surface of 5-Volts Positive Electrode Materials for Li-Ion Batteries

We examine the reactivity of the non-aqueous electrolyte at the surface of 5-volts positive electrode materials for Li-ion batteries. LiPF6-based electrolytes include various solutes as ethylene carbonate (EC), dimethyl carbonate (DMC), diethyl carbonate (DEC) and 1,2-dimethoxyethane (DME), which react with the surface of LiNi0.5Mn1.5O4 in the voltage range 3.0–4.9 V vs. Li0/Li+. Effects with mixed salts and electrolyte additive are also examined.