Abstract
A vast quantity waste sludge is produced from the Silicon (Si) wafers slicing process in semiconductor and photovoltaic industries. Si has been regarded as one of the most potential anodic materials due to its superior theoretical capacity, thus the recycled Si microparticles can be employed as the raw material for lithium-ion battery anode. Turning the waste powder into high-value products is of strategic importance for industrial processes. In this study, Rapid Thermal Process (RTP) is introduced to recycle the waste powder. A prominent anodic material of Si-MP/C porous continuous structure composite is obtained via in-spaced carbonization of water-soluble CMC binder and surface oxidation of Si particles during the direct heat treatment on the electrode. This strategy provides buffer space, which is constructed by carbon porous continuous conductive framework throughout the entire electrode, to resist local stress and intense volume variation. In addition, a sufficiently electrochemically stable SEI layer is accomplished with the coating of SiOx film and amorphous carbon on the surface of Si-MP. Under these circumstances, the enhanced electrodes achieve a first cycle efficiency of approximately 80% and a reversible charge capacity of 800mAhg-1 over 100 cycles at 0.5Ag-1 with good retention. Through a green and simple procedure, a remarkable Si-MP embedded C-matrix porous continuous conductive framework is established to achieve commercially potential high-capacitive Si-MP/C composite anodes and also to resolve the issues of waste disposal.