Electrospun sandwich-structured C@Si/C@C as anode for advanced lithium-ion batteries

Abstract

Due to its abundant deposits and high theoretical capacity, silicon (Si) has been extensively investigated as an anode material for lithium-ion batteries (LIBs). Current research is focused on solving problems such as the huge volume expansion of Si (about 300 %) and electrical conductivity. In this study, a C@Si/C@C self-supported anode material with a sandwich structure was successfully prepared by the electrostatic spinning method. This unique structure effectively modified the agglomeration, volume expansion, and low conductivity of Si nanoparticles, resulting in a more stable and substantial specific capacity. Even after 6,000 cycles at a high current density of 2 A g⁻¹, a specific capacity of 623.4 mAh g⁻¹ was maintained. The sandwich-structured silicon-carbon composite provides a novel, efficient, and feasible solution.