模板-电沉积法制备孔状结构锡钴负极材料

采用模板-电沉积法制备Sn-Co合金锂离子电池负极材料. 用以柠檬酸、EDTA为络合剂混合CoCl2、SnCl4制备的溶液为电解液,在聚苯乙烯微球(PS)为模板的辅助下制备多孔Sn-Co电极. SEM测试表明:模板电沉积法制得Sn-Co电极表面为多层多孔三维结构. EDS能谱分析表明:多层多孔镀层中Sn-Co原子比(Sn: Co)接近0.72: 1. 首次充放电比容量分别为491.4 mAh/g和1 168.1 mAh/g,经过65次充放电循环之后,其充放电比容量仍然为401.5 mAh/g和419.1 mAh/g.     

Sn-Co薄膜电极界面过程原位傅里叶变换红外光谱表征

锂离子电池的界面反应对电池的循环性能、寿命、化学和物理稳定性,以及不可逆容量有重要的影响.运用显微傅里叶变换红外光谱(microscope FTIRS,MFTIRS)深入地研究了Sn-Co电极的界面反应和过程.结果表明,原位显微傅里叶变换红外光谱可清楚地给出Sn-Co合金的嵌锂和脱锂过程中的溶剂化和去溶剂化信息.     

Facile hydrothermal and sol-gel synthesis of novel Sn-Co/C composite as superior anodes for Li-ion batteries

As an anode material in lithium ion battery, the Sn-Co/C composite electrode materials have been successfully synthesized by hydrothermal and solgel methods, respectively. The resultant composites were mainly composed of Snbased oxides, nanometer Sn-Co alloy and carbon. Carbon and Co, acting as buffer materials, can accommodate to the large volume change of active Sn during the discharge-charge process, thus improving the cycling stability. Although charge/discharge curves revealed the excellent cycle performance for samples synthesized by both methods, composites obtained by the sol-gel showed a better dispersion effect of nanoparticles on the carbon matrix and possessed much more improved stable capacity with 624.9 mAh g-1 over 100 cycles and that by hydrothermal method only exhibited ～299.3 mAh g-1. Therefore, the Sn-Co/C composites obtained by solgel synthesis method could be a perfect candidate for anode material of Liion storage battery.