Study on the anode behavior of Sn and Sn–Cu alloy thin-film electrodes
Study on the anode behavior of Sn and Sn–Cu alloy thin-film electrodes
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DOI：
10.1016/s0378-7753(01)00979-x
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发表时间：
2002-04
影响因子：
9.2
通讯作者：
Noriyuki Tamura;R. Ohshita;M. Fujimoto;S. Fujitani;M. Kamino;I. Yonezu
中科院分区：
文献类型：
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作者：
Noriyuki Tamura;R. Ohshita;M. Fujimoto;S. Fujitani;M. Kamino;I. Yonezu
锡粉末阳极具有较大的比容量，但不可逆容量大，循环性能差。为了将其作为锂二次电池的负极，我们重点研究了电沉积工艺，研究了在铜箔上电沉积锡层。在全充放电条件下，在0 ~ 2.0V与Li/Li+之间充放电，第一次放电容量为940mAhg−1，是石墨的2.5倍，第一次循环库仑效率为93%，但循环性能没有提高。为了提高活性材料与铜箔之间的界面强度，我们研究了一种用沉积阳极退火制备的阳极。在完全充放电条件下，第一次充放电特性与沉积阳极基本相当，10次循环后的保持容量比由20%提高到94%。认为这种改善是由于热处理在锡层和铜集流器之间形成了两种不同的锡-铜金属间化合物层。研究了用这种退火阳极作为负极的小电池。该电池在前20次循环中提供了良好的循环性能。
Anodes based on tin metal powder offer large specific capacity, but also exhibit large irreversible capacity and poor cycle performance. In order to use them as a negative electrode for lithium secondary batteries, we focused on the electrodepositing process and investigated an electrodeposited tin layer on copper foil. In the full charge–discharge condition, charging and discharging between 0 and 2.0V versus Li/Li+, the first discharge capacity was 940mAhg−1, which was 2.5 times as large as that of graphite, and the coulomb efficiency in the first cycle was 93%, but its cycle performance was not improved. In order to enhance the interface strength between the active material and the copper foil, we investigated an anode which was fabricated by annealing an as-deposited anode. In the full charge–discharge condition, the first charge–discharge characteristics were almost equivalent to the as-deposited anode, and the retention capacity ratio after 10 cycles was improved from 20 to 94%. It is considered that this improvement resulted from the formation of two different tin–copper intermetallic compound layers between the tin layer and the copper current collector due to the heat treatment. A small cell using this annealed anode as a negative electrode was also investigated. This cell offered good cycle performance for the first 20 cycles.