High-performance SiO/C Anode Material in Li-ion Battery by Pre-disproportionation Treatment
XIA Wenming1,2, TANG Renheng2, WANG Hui1, WANG Ying2,XIAO Fangming2, ZHU Min1, SUN Tai2
1 Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641; 2 Guangdong Province Key Laboratory of Rare Earth Development and Application, Guangdong Research Institute of Rare Metals, Guangzhou 510650
Abstract: Starting from the SiO and sucrose, a SiO/C composite for Li-ion battery anode material with excellent electrochemical performance was prepared by the disproportionation treatment of SiO at high temperature, which was followed by mechanical milling, spray drying and pyrolysis. XRD, FTIR, XPS, SEM, TEM analysis indicated that there exist amorphous SiO, crystalline Si and SiO2 in the disproportionated SiO plates, and the prepared spherical SiO/C particles were composed of refined SiO plates, which were coated with pyrolyzed disordered carbon. The pre-disproportionated SiO/C composite exhibited an initial discharge capacity of 1 314.6 mAh/g with an initial Coulombic efficiency of 71% at 100 mA/g, and a discharge capacity of 851.2 mAh/g after 100 cycles. The capacity retention of disproportionated SiO/C composite was 78.5%, which was much higher than that for undisproportionated SiO/C composite. The excellent electrochemical performances are attributed to the disproportionation of SiO and the pyrolytic carbon coating.
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2017, Vol. 31 
