Synthesis of micro-nano sphere structure silicon–carbon composite as anode material for lithium-ion batteries

Abstract

Here, a new micro-nano sphere structure of silicon–carbon composite anode materials is fabricated using spray drying and surface modification. Fulvic acid (FA) is used as the carbon source, which forms voids between nanoscale silicon–carbon particles. The results demonstrate by rate performance that particle voids can significantly enhance the lithium-ion transport rate. The Si@FA-2 material offered a high capacity of 917.28 mAh g−1 after 100 cycles at a current density of 0.1 A g−1. Thus, fabricating a micro-nano sphere structure using FA as the carbon source offers a helpful exploration of silicon-based anode materials.