LiPO-enriched solid electrolyte interphase on Si-based anode for enhanced Li transport and interfacial stability in lithium batteries.

The structure and composition of the solid electrolyte interphase (SEI) exerts a significant influence on the fast-charging capability and stability of lithium-ion batteries (LIBs). However, elucidating the design principles governing anode interfacial structures and revealing the kinetics and mechanisms of Li transport remain challenging. SEI layer. Herein, we present an efficient synthesis strategy for fabricating LIBs anodes consisting of silicon nanoparticles coated with a LiPO-modified carbon shell (Si@C@LPO). Through a combination of comprehensive experimental investigations and density functional theory (DFT) calculations, we elucidate the influence of SEI layer enriched with various inorganic components on Li transport. The high adsorption energy of the LiPO-enriched SEI enhances its affinity for Li during the cycling process and suppresses solvent decomposition at the anode interface, thereby improving both fast-charging performance and electrode stability. Consequently, the Si@C@LPO anode exhibit a specific capacity of 605.67 mAh g at 8 A g and significantly enhanced cycling durability with a higher capacity retention of 73.3 % after 100 cycles at 1 A g. This strategy establishes a clear correlation among SEI components, Li transport kinetics, and the design of interfacial structures in high performance LIBs anode materials.