Artificial solid electrolyte interphase coating to reduce lithium trapping in silicon anode for highly stable lithium storage

Silicon (Si) has been regarded as a commercially viable anode material because of its outstanding theoretical capacity and rich abundance. However, the poor intrinsic electric conductivity , inherent volume expansion, and lithium trapping problems impede further commercialization. Here, we proposed a dual-design strategy by introducing mesoporous carbon and LiAlO 2 as an artificial solid electrolyte interphase (SEI) on Si-based anode. The combination of mesoporous carbon and LiAlO 2 both improves the structural stability of the Si-based anode and provides a fast diffusion pathway for lithium ions, thus improving the utilization of lithium. Moreover, thanks to the artificial SEI, the Si anode represent a remarkable electrochemical performance , delivering a specific capacity of 1910.3 mAh g -1 at a current density of 0.2 A g -1 with capacity retention of 73.4% in 140 cycles and prominent rate capability with a discharge capacity of 795.4 mAh g -1 at 1.0 A g -1 in 500 cycles, 456.2 mAh g -1 at 5.0 A g -1 in 1000 cycles.