10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
Abstract View
Fabrication of Graphene Encapsulated Silicon Composites from Graphene Oxides and Waste Silicon Sludge for Lithium Ion Batteries
HEE DONG JANG, Sun Kyung Kim, Hankwon Chang, Korea Institute of Geoscience & Mineral Resources
Abstract Number: 106 Working Group: Materials Synthesis
Abstract Over 40% of high-purity silicon (Si) ingot is consumed as sludge waste consisting of Si, silicon carbide (SiC) particles and metal impurities during Si wafer slicing in semiconductor fabrication. Recovery of Si from the waste Si sludge has been a great concern because Si particles are promising high-capacity anode materials for Li ion batteries (LIBs).
In this study, we report a novel aerosol process that not only extracts Si particles but also generates Si-graphene (GR) composites from the colloidal mixture of waste Si sludge and graphene oxide (GO) at the same time by ultrasonic atomization-assisted spray pyrolysis. The effects of the operating temperature, concentration of Si sludge powder and GO in the colloidal mixture on the particle properties were investigated. The morphology of the as-formed Si-GR composites looked like a crumpled paper ball and the average size of the composites varied from 0.6 to 0.8 µm with variation of the process variables. The Si-GR composites exhibited very high performance as Li ion battery anodes in terms of capacity, cycling stability, and Coulombic efficiency.