锂离子电池Si/MCMB复合负极材料的制备及其性能  

Preparation and performance of Si/MCMB composites as anode materials for lithium-ion batteries

作　　者：杨晓武[1] 杨蕊[1] 

机构地区：[1]陕西科技大学教育部轻化工助剂化学与技术重点实验室,陕西西安710021

出　　处：《陕西科技大学学报》2017年第4期49-53,共5页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(51373091);陕西科技大学博士科研启动基金项目(BJ11-10)

摘　　要：采用简单易行的机械球磨法制备出硅(Si)/中间相炭微球(MCMB)复合负极材料.通过扫描电子显微镜(SEM)、X-射线衍射仪(XRD)表征和电化学性能测试等,研究了以中间相炭微球为基体,纳米硅粉的添加量对复合材料结构、形貌以及电化学性能的影响.结果表明,含10wt%纳米硅粉的复合电极显示出了类似于纯MCMB电极的循环性能稳定,且具有更高的比容量.其首次放电比容量为945mAh/g,循环100圈后,比容量仍维持在800 mAh/g,容量保持率为84.7%.Si/MCMB composite anode materials were synthesized by a facile method of mechanical ball milling.In order to discuss the effect of the amount of nano-Si powder in the composites with the MCMB as matrix,the structure,the morphology and the electrochemical performance of the materials were investigated by scanning electron microscope(SEM),X-ray diffraction(XRD)and electrochemical tests.The results show that,the composites anode with 10 wt% nano-Si powder exhibits much better electrochemical properties,which has agood cyclability like pure MCMB anode and a higher reversible capacity.The initial discharge capacities is 945 mAh/g,and still keep in 800 mAh/g after 100 cycles with a capacity retention up to 84.7%.

关 键 词：纳米硅粉 中间相炭微球 锂离子电池 复合材料 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]