A novel Si/TiSi2/G@C composite as anode material with excellent lithium storage performances

Abstract

Herein, a novel Si/TiSi2/G@C composite was constructed by a facile solid-state method using photovoltaic (PV) silicon waste, Ti-bearing blast furnace slag (TBBFS), scrap graphite and citric acid as raw materials. The Si/TiSi2/G@C composite exhibits excellent lithium storage performances including cycling behavior and rate capability, with a discharge capacity of 943.8 mAh g−1 maintained after 120 cycles at 800 mA g−1, and delivering a reversible capacity of 744.0 mAh g−1 at 1600 mA g−1. The improved electrochemical performances can be attributed to the synergistic effect of TiSi2, graphite and amorphous carbon coating. This study provides a new strategy and technology for Si-based anode materials and a green technical route for the high value-added recycling of PV silicon waste and TBBFS.