AAAR 34th Annual Conference
October 12 - October 16, 2015
Hyatt Regency
Minneapolis, Minnesota, USA
Abstract View
Crumpled Graphene-Encapsulated Si Composites as Anode Materials for Li Ion Batteries
KIM HYEKYOUNG, Kil Dae Sup, Chang Hankwon, Choi Ji-Hyuk, Kim Hansu, Hee Dong Jang, University of Science and Technology
Abstract Number: 637 Working Group: Nanoparticles and Materials Synthesis
Abstract Rapid growth of the semiconductor and PV industry has led to a shortage of silicon and has also increased the price of silicon. Over 40% of silicon is consumed as a slurry waste during wafer slicing process. In this study, we present effective recovery of the Si particles from the waste silicon sludge by the ultrasonic spray drying after acid treatment. The Si-GR composites that Si nanoparticles wrapped by crumpled graphene shells were fabricated with recovered Si and graphene for anode material of Li ion battery. The morphological, crystallinity, composition of silicon particles and Si-GR composites were analyzed by SEM, XRD, PSA, ICP and STEM. Galvanostatic charge/discharge measurements for the electrochemical performance were conducted at various current densities between voltages of 0.0 and 2.0 V (V versus Li/Li+). The ultrasonic spray drying was found as effective methods to recover silicon particles and metallic impurities were effectively removed by acid treatment. The Si-GR composites were successfully prepared by aerosol process and heat treatment. The composite capsules have greatly improved performance as Li ion battery anodes in terms of capacity, cycling stability, and Coulombic efficiency by comparison with the native Si particles.