Development of Dimethyl Phosphate and Vinyltriethoxysilan as an Electrolyte Additive for Lithium Ion batteries

The novel electrolyte additive lithium dimethyl phosphate (LiDMP) has been synthesized and characterized. Incorporation of LiDMP (0.1% wt) into LiPF6 in ethylene carbonate (EC) / ethyl methyl carbonate (EMC) (3:7 wt) results in improved rate performance and reduced impedance for graphite / LiNi1/3Mn1/3Co1/3O2 cells. Ex-situ surface analysis of the electrodes suggests that incorporation of LiDMP results in a modification of the solid electrolyte interphase (SEI) on the anode. Lithium-ion batteries (LIBs) have attracted attention due to their potential to facilitate the rapid development of mobile electronic devices, electronic vehicles and energy storage. However, the high flammability of carbonate-based electrolytes has long been one of the most important obstacles for the further applications of these types of batteries. To develop safer advanced batteries, herein we use an environmentally-friendly additive, vinyltriethoxysilane (VTES), to suppress the flammability of a carbonatebased electrolyte.