In Situ Catalyzed Growth of Carbon Nanotube with Asphalt Cladding as a Bicarbon Synergistic Framework of Silicon Anodes for Lithium‐ion Batteries

Abstract

Silicon, as the most promising advanced anode material for lithium‐ion batteries, faces challenges in large‐scale industrial production due to the significant volume expansion effect. In this investigation, Si/CNTs/C composite materials were effectively produced through high‐temperature carbonization utilizing asphalt, silicon, hexahydrate ferric chloride, and melamine as primary elements. The distinctive dual‐carbon framework of asphalt‐derived carbon and carbon nanotubes alleviates the volume expansion of silicon, thereby stabilizing the composite material's structure. Testing the electrochemical performance reveals that the Si/CNTs/C composite material exhibits a reversible specific capacity of 1187 mAh g‐1 with a capacity retention rate of 92.6% after 150 cycles at a current density of 0.2 A g‐1. Even after 500 cycles at a current density of 1 A g‐1, it sustains a specific capacity of 879.4 mAh g‐1 with a capacity retention rate of 87.9%, showcasing outstanding electrochemical performance