锂离子电池Si/MCMB复合负极材料的制备及其性能

摘要

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 a good 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%.%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10 wt%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945 mAh/g,循环100圈后,比容量仍维持在800 mAh/g,容量保持率为84.7%.