用电沉积方法在铜集流体上分别制备出不同厚度(2,0.5,0.25,0.12μm)的锡薄膜电极.用扫描电镜观察其表面形貌、以充放电实验比较其性能.结果表明,减小Sn薄膜厚度可改善电极的循环性能,但首次容量损失也增大.0.5μm厚的Sn薄膜具有最高的放电容量和较好的循环稳定性;其首次放电比容量为749 mAh/g,40次循环时放电比容量仍保持578 mAh/g.
Sn film electrodes with different thickness (2, 0.5, 0.25, 0.12 μm), as anode materials for lithium-ion batteries were prepared by electrodeposition onto copper foil collector. Their microstructures were observed by SEM and the performances were studied through charging-discharge experiments. Result show that the performances of Sn film electrodes can be improved by the thickness decrease, but the first reversible capacity loss was increased at the same time. The electrode of 0.5 μm thickness shows the highest discharge capacity and better cyclic stability: its discharge capacity is 749 mAh/g for the first cycle and keeps 578 mAh/g after 40 cycles.
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