氧化亚硅/石墨/碳复合材料的制备及其电化学性能

Preparation and Electrochemical Cycle Performance of SiO/G/C Composite Anode Material

采用高能球磨法和高温焙烧法,以氧化亚硅、石墨和葡萄糖为原料,制备了氧化亚硅/石墨/碳(SiO/G/C)复合材料,研究了其最佳制备条件和电化学性能.结果显示,在氩气中700℃下焙烧2h后所制得的SiO/G/C负极材料在质量比为SiO∶G∶C=34∶51∶15时具有最佳的电化学性能.该复合材料首次放电容量为803.5mAh/g,50周时放电容量仍保持在592mAh/g.XRD结果表明,该复合材料主要组成为SiO、石墨和无定形碳.石墨和无定形碳的添加对SiO的电化学性能有显著改善作用.

A SiO/graphite/amorphous carbon（SiO/G/C）composite material has been prepared by a high temperature pyrolysis process and a high-energy ball-milling technique,using SiO,graphite and glucose as raw materials.The optimized preparation conditions and corresponding electrochemical performance were investigated.The results showed that the SiO/G/C composite with the promising electrochemical performance could be prepared by calcination at 700℃in Ar with a weight ratio of 34∶51∶15（SiO∶G∶C）.The initial discharge capacity of the（SiO）34G51C15anode material was 803.5mAh/g.After 50 cycles,the reversible capacity still maintained above 592mAh/g.The XRD result indicated that the composite was composed of SiO,graphite and amorphous carbon.Addition of the graphite and the amorphous carbon was believed to significantly improve the electrochemical performance of SiO.