Manandhar Kedar, Ren Yaoyu, Stasak Drew, Hou Huilong, Kirsch Dylan, Sarker Suchismita, Mehta Apurva, Sardar Saydul, Xiao Muye, Weaver Jamie L, León Carlos, Hart Gus, Sunaoshi Takeshi, Lemmon John P, Takeuchi Ichiro
Department of Materials Science and Engineering, University of Maryland, College Park, Maryland20742, United States.
Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United State.
ACS Appl Energy Mater. 2020;3(3). doi: 10.1021/acsaem.9b02252.
To realize high specific capacity Li-metal batteries, a protection layer for the Li-metal anode is needed. We are carrying out combinatorial screening of Li-alloy thin films as the protection layer which can undergo significant lithiation with minimum change in volume and crystal structure. Here, we have fabricated lithium-free binary alloy thin film composition spreads of Co 1-xSnx on Cu layers on Si substrates. The crystallinity of the thin films was tuned by varying the deposition temperature followed by electrochemical lithiation to form Li-alloy ternary thin films. Synchrotron diffraction is used as the main tool to investigate the crystallinity of the films before and after lithiation. Co 3Sn2 alloy thin films are found to exhibit significant lithium uptake capacity while maintaining its structural integrity, and are thus a good candidate of the Li-metal protection layer.
为实现高比容量锂金属电池，需要一种用于锂金属负极的保护层。我们正在对锂合金薄膜作为保护层进行组合筛选，这种保护层在锂化过程中体积和晶体结构变化最小，但能发生显著的锂化反应。在此，我们在硅衬底上的铜层上制备了Co 1-xSnx无锂二元合金薄膜成分分布。通过改变沉积温度来调节薄膜的结晶度，随后进行电化学锂化以形成锂合金三元薄膜。同步辐射衍射用作研究锂化前后薄膜结晶度的主要工具。发现Co 3Sn2合金薄膜在保持其结构完整性的同时表现出显著的锂吸收能力，因此是锂金属保护层的良好候选材料。
