Micrestructures and electrochemical properties of Si-Ni based alloys fabricated by melt spinning process

摘要

In this work, Si-Ni-Al and Si-Ni-Cu-Al alloy ribbons were fabricated by melt spinning process to minimize the effect of the volume change of silicon particles. Si_(52)Ni_(41)Al_7 and Si_(50)Ni_(25)Cu_(15)Al_(10) alloy ribbons by atomic ratio were prepared by arc-melting followed by melt spinning process. The melt-spun ribbons were fragmented to produce powder. Subsequently, acetylene black (AB), polyvinylidene fluoride (PVDF) and N-methylpyrrolidinone (NMP, 7cc) were added into the alloy powder and mixed by planetary milling for 2 hours. The electrochemical properties of the cells were measured at 100 mAh/g current density between 0.01 and 2.0V. Microstructural evaluation and phase analysis were conducted by transmission electron microscopy (TEM) and scanning electron microscopy (SEM) combined with energy-dispersive spectrometry (EDS).