Han Zhiyuan, Ren Hong-Rui, Huang Zhijia, Zhang Yunbo, Gu Sichen, Zhang Chen, Liu Wenhua, Yang Jinlong, Zhou Guangmin, Yang Quan-Hong, Lv Wei
Shenzhen Geim Graphene Center, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China.
College of Materials Science and Engineering, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
ACS Nano. 2023 Mar 14;17(5):4453-4462. doi: 10.1021/acsnano.2c10047. Epub 2023 Feb 22.
Lithium metal is a desirable anode for high-energy density lithium-sulfur (Li-S) batteries. However, its reliability is severely limited by dendrite growth and side reactions with polysulfides, which are yet challenging to solve simultaneously. Herein, we report a protective layer that works the same way as the ion-permselective cell membrane, yielding a corrosion-resistant and dendrite-free Li metal anode specially for Li-S batteries. A self-limited assembly of octadecylamine together with Al ions on a Li metal anode surface produces a dense, stable yet thin layer with ionic conductive Al-Li alloy uniformly embedded in it, which prevents the passage of polysulfides but regulates the penetrated Li ion flux for uniform Li deposition. As a result, the assembled batteries show excellent cycling stability even with a high sulfur-loaded cathode, suggesting a straightforward but promising strategy to stabilize highly active anodes for practical applications.
锂金属是高能量密度锂硫（Li-S）电池理想的负极材料。然而，其可靠性受到枝晶生长和与多硫化物的副反应的严重限制，而要同时解决这些问题仍具有挑战性。在此，我们报道了一种起到与离子选择透过性细胞膜相同作用的保护层，它能产生一种专门用于Li-S电池的耐腐蚀且无枝晶的锂金属负极。十八烷基胺与铝离子在锂金属负极表面的自限性组装产生了一层致密、稳定但很薄的层，其中均匀嵌入了离子导电的铝锂合金，这阻止了多硫化物的通过，但调节了穿透的锂离子通量以实现均匀的锂沉积。结果，即使使用高硫负载的正极，组装的电池也表现出优异的循环稳定性，这表明了一种简单但有前景的策略，可用于稳定高活性负极以实现实际应用。
