Surface passivated LixSi with improved storage stability as a prelithiation reagent in anodes

In recent years, lots of efforts have been applied to improve the initial Coulombic efficiency (ICE) of lithium-ion batteries (LIBs), among which prelithiation is considered to be one of the most promising schemes. Here we report a modified Li x Si with high lithium reserves and great environmental adaptability as the prelithiation reagent, which can make up for the capacity loss of the negative electrode in the first cycle. Through the chemical reaction between aluminum isopropoxide and Li x Si, a protective layer consisting of Li x Al y SiO z /Li 2 O is formed on the surface of Li x Si particles. This synthesized material provides a new idea for the actual industrial production of prelithiation.