Swelling-Suppressed Si/Siox Wrapped in Graphene for High Performance Li Storage Material

Tuesday, 3 October 2017: 12:10
Maryland C (Gaylord National Resort and Convention Center)
H. Yoo, E. Park (Hanyang University), H. Kim (Korea Institute of Geoscience & Mineral Resources), J. Bae (Hanyang University), H. Chang (Korea Institute of Geoscience & Mineral Resources), D. S. Kim (Hanyang University), H. D. Jang (Korea Institute of Geoscience & Mineral Resources), and H. Kim (Hanyang University)
Si as an anode material for lithium-ion batteries has high theoretical capacity(3,580 mAhg-1), but Si has critical technical problems for its commercial such as poor cycle performance associated with severe volume changes during lithium insertion and desertion. In this work, we synthesized Si/SiOx nanospheres enveloped by reduced graphene oxide(rGO) shell layer using aerosol spray pyrolysis. Free void spaces between rGO envelop and Si/SiOx effectively accommodated the volume changes of silicon during cycle. Thus rGO wrapped SiOx nanospheres showed high reversible capacity of about 914 mAhg-1 with excellent capacity retention up to 200 cycle. In the presentation, more detailed microstructural characterization and electrochemical properties of the rGO wrapped Si/SiOx nanosphere anode material will be discussed.