High-Performance Lithiated SiO Anode Obtained by a Controllable and Efficient Prelithiation Strategy.

Silicon-based electrodes are promising and appealing for futuristic Li-ion batteries because of their high theoretical specific capacity. However, massive volume change of silicon upon lithiation and delithiation, accompanied by continual formation and destruction of the solid-electrolyte interface (SEI), leads to low Coulombic efficiency. Prelithiation of Si-based anode is regarded as an effective way for compensating for the loss of Li in the first discharging process. Here, a high-performance lithiated SiO anode was prepared by using a controllable, efficient, and novel prelithiation strategy. The lithiation of SiO is homogeneous and efficient in bulk due to well-improved Li diffusion in SiO. Moreover, the in situ formed SEI during the process of prelithiation reduces the irreversible capacity loss in the first cycle and thus improves the initial Coulombic efficiency (ICE). Half-cells and full cells based on the as-prepared lithiated SiO anode prominently increase the ICE from 79 to 89% and 68 to 87%, respectively. It is worth mentioning that the homogeneously lithiated SiO anode achieves stable 200 cycles in NCM622//SiO coin full cells. These exciting results provide applicable prospects of lithiated SiO anode in the next-generation high-energy-density Li-ion batteries.