Yin Yi-Chen, Wang Qian, Yang Jing-Tian, Li Feng, Zhang Guozhen, Jiang Chen-Hui, Mo Hong-Sheng, Yao Ji-Song, Wang Kun-Hua, Zhou Fei, Ju Huan-Xin, Yao Hong-Bin
Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, 230026, Hefei, Anhui, China.
Department of Applied Chemistry, University of Science and Technology of China, 230026, Hefei, Anhui, China.
Nat Commun. 2020 Apr 9;11(1):1761. doi: 10.1038/s41467-020-15643-9.
Fabricating a robust interfacial layer on the lithium metal anode to isolate it from liquid electrolyte is vital to restrain the rapid degradation of a lithium metal battery. Here, we report that the solution-processed metal chloride perovskite thin film can be coated onto the lithium metal surface as a robust interfacial layer to shield the lithium metal from liquid electrolyte. Via phase analysis and density functional theory calculations, we demonstrate that the perovskite layer can allow fast lithium ion shuttle under a low energy barrier of 0.45 eV without the collapse of framework. Such perovskite modification can realize stable cycling of LiCoO|Li cells with an areal capacity of 2.8 mAh cm using thin lithium metal foil (50 μm) and limited electrolyte (20 μl mAh) for over 100 cycles at 0.5 C. The metal chloride perovskite protection strategy could open a promising avenue for advanced lithium metal batteries.
在锂金属负极上制备坚固的界面层以使其与液体电解质隔离，对于抑制锂金属电池的快速降解至关重要。在此，我们报道溶液处理的金属氯化物钙钛矿薄膜可作为坚固的界面层涂覆在锂金属表面，以保护锂金属免受液体电解质的侵蚀。通过相分析和密度泛函理论计算，我们证明钙钛矿层能够在0.45 eV的低能垒下实现快速锂离子穿梭，且框架不会坍塌。这种钙钛矿修饰能够使用薄锂金属箔（50μm）和有限的电解质（20μl mAh），在0.5 C下实现面积容量为2.8 mAh cm²的LiCoO₂|Li电池稳定循环超过100次。金属氯化物钙钛矿保护策略可为先进锂金属电池开辟一条有前景的途径。
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