Application of nano-coated silicon-based materials in lithium-ion anodes

Abstract

In recent years, Silicon-based anode have became one of the most promising candidates for next-generation lithium-ion batteries due to its superior electrical performance, materia; abundance and environmental friendly property. However, it still has so many disadvantages, such as volume expansion (~300%), unstable solid-electrolyte interphase (SEI), and rapid capacity fading hinder their commercialization. This paper evaluates three advanced nano-coating strategies， Si-C, Si-metal oxide (Al₂O₃), and Si-polymer (x-PAN), to address these limitations. First, Si@Graphene composites exhibit exceptional capacity (3578 mAh/g) and rate capability (975 mAh/g at 5 A/g) but suffer from graphene defects and complex synthesis, while Al₂O₃ coatings reduce SEI growth and lithium loss by 37%, yet their brittleness and insulating nature limit energy density. In contrast, crosslinked Si-polymer anodes achieve 76.2% capacity retention after 1,000 cycles and high-rate performance (1880 mAh/g at 50C), but face scalability challenges due to pinhole formation and costly processing. Such key findings and comparisons highlight trade-offs between performance, manufacturability, and cost. Hybrid designs (e.g., conductive/oxide multilayers) and scalable techniques (e.g., dry electrode processing) are recommended to bridge these gaps. This analysis provides actionable insights for developing commercially viable silicon anodes in high-energy lithium-ion batteries for electric vehicles.