A High-performance SiOx/C/graphene Composite Anode for Lithium Ion Batteries
LI Wenchao1,2,3, WANG Ying2,3, TANG Renheng2,3, XIA Wenming2,3, XIAO Fangming2,3, WANG Huakun1, HUANG Ling2,3, SUN Tai2,3
1 School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093; 2 Guangdong Province Key Laboratory of Rare Earth Development and Application, Guangzhou 510650; 3 Guangdong Research Institute of Rare Metals, Guangzhou 510650
Abstract: A SiOx/C/graphene composite anode for lithium ion batteries with excellent electrochemical performance was prepared from SiO, SBR and graphene via the disproportionation treatment of SiO at high temperature, mechanical milling, spray drying and pyrolysis. The phase composition, morphology and electrochemical performance of the composites were detected by X-ray diffractometer (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), energy disperse spectroscopy (EDS) and constant current charge-discharge test. The electrochemical test results revealed that the initial discharge capacity of pyrolytic SiOx/C/graphene composite anode material was 1 807 mAh/g. The reversible capacity reached 1 349 mAh/g and the Coulombic efficiency was 99.1% after 100 cycles, indicating a much higher cyclic stability compared to the SiOx/C and SiOx/C/graphene precursors, along with a good rate performance.
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2017, Vol. 31 
