silicon carbon core shell particel synthsus

By virtue of structural advantages, the as-fabricated anode displays a high initial Coulombic efficiency of 89.8%, a high reversible capacity of 1269.6 mAh g -1 at 100 mA g -1, and excellent cycle performance with a capacity of 708.6 mAh g -1 and 87.1% capacity retention after 820 cycles at 1000 mA g -1, outperforming the reported results of Si/C composite anodes. Si nanoparticles embedded in a microsized cross-linked C matrix show excellent electrical conductivity and superior structural stability. The outer smooth and robust C shells strengthen the stability of the entire structure and the solid-electrolyte interphase.

The as-obtained composite has high porosity that provides sufficient inner voids to alleviate the huge volume expansion of Si. In this study, we report the large-scale synthesis of an intriguing micro/nanostructured pore-rich Si/C microsphere consisting of Si nanoparticles tightly immobilized onto a micron-sized cross-linked C matrix that is coated by a thin C layer (denoted using a low-cost spray-drying approach and a chemical vapor deposition process with inorganic salts as pore-forming agents. Silicon/carbon (Si/C) composites have rightfully earned the attention as anode candidates for high-energy-density lithium-ion batteries (LIBs) owing to their advantageous capacity and superior cycling stability, yet their practical application remains a significant challenge.

Silicon carbon core shell particel synthsus