Organosilicon compounds containing nitrile and oligo(ethylene oxide) substituents as safe electrolytes for high-voltage lithium-ion batteries

Organosilicon compounds containing nitrile and oligo(ethylene oxide) substituents are synthesized as safe electrolytes for high-voltage lithium-ion batteries. We firstly report that these organosilicon electrolytes could be stably cycled at an upper cutoff voltage of 4.4 V in LiCoO2/graphite full cells. [Display omitted] •Organosilicon compounds synthesized as safe electrolytes for high-voltage Li-ion batteries.•First report of organosilicon electrolytes cycled stably at 4.4 V in LiCoO2/graphite cell.•Delivered a discharge capacity of 152 mAh g−1 for 185 cycles with negligible decay at 0.2 C rate.