为了改善锂离子电池锡负极的循环性能,将碳纳米管与锡负极复合,以铜片为基底,采用复合电沉积的方式制备了含有不同直径碳纳米管的Sn-CNTs复合电极,并对其表面形貌,成分与结构分别进行了扫描电子显微镜法（SEM）、X射线衍射光谱法（XRD）、能量散射光谱（EDS）分析。最后,组装模拟电池并测试其电化学性能。结果表明：制备的电极表面不规则,可明显观察到CNTs与Sn颗粒,且当CNTs直径为10~20 nm时,其在镀层内含量最高,制备的Sn-CNTs复合电极循环性能最佳,经过50次充放电循环后,其比容量仍能达到420 m Ah/g。
The Al-5Ti-0.2C-based grain refiners with different contents of rare earth(RE) were successfully prepared via powder metallurgy and vacuum casting. The microstructural evolution has been studied by X-ray diffraction(XRD), differential scanning calorimetry(DSC), scanning electron microscopy(SEM) and transmission electron microscopy(TEM). The results showed that the RE addition resulted in the formation of Ti Al3/Ti2Al20 RE core-shell structured primary particles, and the size of Ti Al3 core decreased, while the thickness of Ti2Al20 RE increased with increase of RE contents. As compared to Al-5Ti-0.2C grain refiner, the grain refining efficiency was gradually improved with increase of RE contents, which was mainly attributed to the Ti Al3/Ti2Al20 RE core-shell structured primary particles and insoluble Ti C nuclei formed in α-Al matrix. The formation mechanism of core-shell structure was further investigated based on Ginstling-Brounstein model.
