Reinforced Interfacial Interaction between Si and Graphite To Improve the Cyclic Stability of Lithium-Ion Batteries

Preparing Si/C composite material with uniformly dispersed Si particles and stable electrode structure remains a huge challenge. In this study, a Si/C composite material with reinforced interfacial interaction (Si&AG) was successfully synthesized. Utilizing the HF-plasma technique, the metallurgical Si with large particle size was evaporated and nucleated, resulting in nanocrystallization and uniform dispersion onto the graphite surface. More importantly, a robust but thin SiC layer formed at the contact region ensures a steadfast adhesion of Si onto graphite. As anode for lithium-ion batteries, Si&AG exhibits a remarkable ICE of 87.9% and an impressive capacity retention of 78.1% after 500 cycles at 0.1 A g^-1. Even under high current densities, it consistently demonstrates a remarkable electrochemical performance (149.6 mAh g^-1 at 3 A g^-1). These exceptional properties can be attributed to the reinforced interfacial interaction facilitated by a robust but thin SiC layer, which endows the electrode with a stable structure and consequently performs excellent electrochemical performances.