In order to easily and simply improve the cyclability of the Sn film negative electrode, we selected Co as a matrix metal and tried to prepare the Co–Sn alloy film negative electrode by a pulse electrodeposition method. The surface morphology of the deposit was almost the same as that of the Sn film, although aggregation partially occurred. The content rate of Co and Sn in the deposit was almost the same as the composition percentage in the electrodeposition bath. X-ray diffraction measurement showed that the deposited film could be assigned to a metastable Co–Sn alloy, while the co-deposition of crystalline Sn was not observed. The galvanostatic charge–discharge tests indicated that the discharge capacity and the charge–discharge efficiency of the Co30.5Sn69.5 alloy film electrode at the 1st cycle were 529.2 mAh g−1 and 87.9%, respectively. Furthermore, the film electrode showed a good cyclability and discharge capacity of 470.5–617.5 mAh g−1 during 50 cyclings. Alloying Sn with inactive Co could effectively improve the cyclability of the Sn film electrode prepared by the pulse electrodeposition method.
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机译：为了轻松简单地提高Sn膜负极的可循环性，我们选择Co作为基体金属，并尝试通过脉冲电沉积法制备Co-Sn合金膜负极。沉积物的表面形态几乎与Sn膜的形态相同，尽管部分发生聚集。沉积物中Co和Sn的含量几乎与电沉积浴中的组成百分比相同。 X射线衍射测量表明，沉积的膜可归因于亚稳Co-Sn合金，而未观察到结晶Sn的共沉积。恒电流充放电测试表明，Co30.5Sn69.5合金膜电极在第一个循环时的放电容量和充放电效率分别为529.2 mAh g-1和87.9％。此外，薄膜电极在50次循环中显示出良好的可循环性和470.5–617.5 mAh g-1的放电容量。将Sn与惰性Co合金化可以有效改善通过脉冲电沉积法制备的Sn膜电极的循环性。
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