高性能锂离子电池SiO/C复合负极材料研究

High-performance SiO/C Composite Anode Material for Lithium Ion Battery

以SiO为硅源,柠檬酸为碳源,通过高能球磨和高温热解制备了一种循环性能优异的锂离子电池SiO/C复合负极材料.采用X-射线衍射仪(XRD)、扫描电子显微镜(SEM)对复合材料的物相和形貌进行了表征.具有孔状结构的柠檬酸热解碳对纳米SiO不仅具有良好的包覆效果,也能有效缓冲电化学嵌脱锂过程中硅颗粒释放出来的体积变化.电化学性能测试表明,SiO/C复合负极材料电极循环100次后容量仍高达803.1mA.h/g,容量保持率为89%.

SiO/C composite anode material with high capacity,high cycling stability for lithium ion battery is synthesized by high-energy mechanical milling and subsequent heat treatment using silicon-monoxide and citric acid as raw materials.The phase composition and micro morphology of the composite material are investigated by the X-ray diffractometer（XRD） and scanning electron microscope（SEM）,indicating nano-sized SiO particles was coated by pyrolytic carbon with porous feature.SiO/C composite electrode presents excellent electrochemical performance with reversible capacity as high as 803.1 mA·h/g and capacity retention rate of 89% after 100 cycles.