Regeneration of Photovoltaic Industry Silicon Waste Toward High-Performance Lithium-Ion Battery Anode

The diamond-wire sawing silicon waste (DWSSW) from the photovoltaic industry has been widely considered as a low-cost raw material for lithium-ion battery silicon-based electrode, but the effect mechanism of impurities presents in DWSSW on lithium storage performance is still not well understood; meanwhile, it is urgent to develop a strategy for changing DWSSW particles into high-performance electrode materials. In this work, the occurrence state of impurities presents in DWSSW was carefully analyzed using in situ Ar ion etching technology. Then, the novel Si@C@SiOx@PAl-N–C composite was designed through in situ encapsulation strategy. The obtained Si@C@SiOx@PAl-N–C electrode shows a high first capacity of 2343.4 mAh·g−1 with an initial Coulombic efficiency (ICE) of 84.4