title: One-Step Formation of Silicon-Graphene Composites from Silicon Sludge Waste and Graphene Oxide via Aerosol Process for Lithium Ion Batteries.
abstract: Over 40% of high-purity silicon (Si) is consumed as sludge waste consisting of Si, silicon carbide (SiC) particles and metal impurities from the fragments of cutting wire mixed in ethylene glycol based cutting fluid 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. In this study, we report a novel one-step 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. This process supports many advantages such as eco-friendly, low-energy, rapid, and simple method for forming Si-GR composite. 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 electrochemical performance was then conducted with the Si-GR composites for Lithium Ion Batteries (LIBs). The Si-GR composites exhibited very high performance as Li ion battery anodes in terms of capacity, cycling stability, and Coulombic efficiency.
authors.affiliation: Rare Metals Research Center, Korea Institute of Geoscience &Mineral Resources, Daejeon, 34132, Korea.
authors.forename: Sun Kyung
authors.initials: SK
authors.lastname: Kim
authors.affiliation: Rare Metals Research Center, Korea Institute of Geoscience &Mineral Resources, Daejeon, 34132, Korea.|Department of Nanomaterials Science and Engineering, University of Science &Technology, Daejeon, 34113, Korea.
authors.forename: Hyekyoung
authors.initials: H
authors.lastname: Kim
authors.affiliation: Rare Metals Research Center, Korea Institute of Geoscience &Mineral Resources, Daejeon, 34132, Korea.|Department of Nanomaterials Science and Engineering, University of Science &Technology, Daejeon, 34113, Korea.
authors.forename: Hankwon
authors.initials: H
authors.lastname: Chang
authors.affiliation: R&D Center for Valuable Recycling, Korea Institute of Geoscience &Mineral Resources, Daejeon, 34132, Korea.
authors.forename: Bong-Gyoo
authors.initials: BG
authors.lastname: Cho
authors.affiliation: Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA.
authors.forename: Jiaxing
authors.initials: J
authors.lastname: Huang
authors.affiliation: Department of Energy Engineering, Hanyang University, Seoul, 04763, Korea.
authors.forename: Hyundong
authors.initials: H
authors.lastname: Yoo
authors.affiliation: Department of Energy Engineering, Hanyang University, Seoul, 04763, Korea.
authors.forename: Hansu
authors.initials: H
authors.lastname: Kim
authors.affiliation: Rare Metals Research Center, Korea Institute of Geoscience &Mineral Resources, Daejeon, 34132, Korea.|Department of Nanomaterials Science and Engineering, University of Science &Technology, Daejeon, 34113, Korea.
authors.forename: Hee Dong
authors.initials: HD
authors.lastname: Jang