性能优异的锂离子电池阳极SiCO@CNFs复合材料的制备

Preparation of excellent lithium-ion battery anode SiCO@CNFs composites

以聚乙烯吡咯烷酮(PVP)为碳前驱体,聚碳硅烷(PCS)为增强相,采用静电纺丝和退火工艺制备SiCO@CNFs复合材料。通过扫描电子显微镜(SEM)、X射线衍射仪(XRD)、X射线光电子能谱(XPS)、热重分析(TG)和傅利叶变换红外光谱(FT-IR)等方法对样品进行结构表征;通过电化学工作站和高性能电池检测系统对样品电化学性能进行测试。结果表明,在100mA/g的电流密度下,SiCO@CNFs复合材料的初始放电容量为1498.71mAh/g。在电流密度为300mA/g时,经过500次循环后,SiCO@CNFs的容量保持率可为49%,而CNFs的容量保持率仅为12%。SiCO@CNFs显示出优异的锂存储性能和循环稳定性。

SiCO@CNFs composites were prepared by electrospinning and annealing process using polyethylene pyrrotanone(PVP)as carbon precursor and polycarbosilane(PCS)as reinforcing phase.The samples were structurally characterized by scanning electron microscope(SEM),X-ray diffractor(XRD),X-ray optoelectronic electron spectroscopy(XPS),thermogravimetric analysis(TG),and Fourier transform infrared spectroscopy(FT-IR).The electrochemical properties of samples were tested by electrochemical workstation and high-performance battery detection system.The results showed that the initial discharge capacity of SiCO@CNFs composite was 1498.71mAh/g at a current density of 100mA/g.At a current density of 300mA/g,the capacity retention ratio of SiCO@CNFs could be retained at 49%after 500 cycles,while the capacity retention ratio of CNFs was only 12%.SiCO@CNFs presented excellent lithium storage performance and cycling stability.