SiC@CNFs锂离子电池负极材料的制备及其循环性能研究

Study on preparation and cycling performance of anode materials for SiC@CNFs lithium-ion battery

通过静电纺丝技术结合碳化工艺制备一种SiC增强碳纳米纤维(SiC@CNFs)复合结构.TGA、XRD、XPS及SEM的样品测试结果显示,SiC颗粒含量(质量分数,全文同)为62%,且均匀分布于CNFs的表面.该结构制备的锂离子电池负极材料既保留了CNFs的高导电性,又获得了SiC增强的结构韧性.电化学性能测试结果表明,将其作为锂离子电池负极材料,循环500次后,容量保留率高达134.01%,远高于CNFs.同时,该结构的电化学阻抗值变化较小,导电性能保持较好.通过静电纺丝技术制备的SiC@CNFs结构作为锂离子电池负极材料,制作成本低,结构可控且性能稳定,是目前对电池负极材料的有益补充.

A SiC-enhanced carbon nanofiber composite(SiC@CNFs)structure was prepared by electrospinning technology combined with carbonization process.The results of TGA,XRD,XPS and SEM show that the mass fraction of SiC particles is 62%,and it is evenly distributed on the surface of CNFs.The lithium-ion battery anode material prepared by this structure not only retains the high electrical conductivity of CNFs,but also obtains the enhanced structural toughness of SiC.The electrochemical performance test results show that the capacity retention rate of the lithium-ion battery anode material is as high as 134.01%after 500 cycles,much higher than that of CNFs.Moreover,the electrochemical impedance value of the structure changes less and the conductivity of SiC@CNFs remains good.SiC@CNFs structures prepared by electrospinning technology serve as lithium-ion battery anode,with low production cost,controllable structure and stable performance,which is a beneficial supplement to the current battery cathode materials.