C. Jiang,# Q. Jia,# M. Tang, K. Fan, Y. Chen, M. Sun, S. Xu, Y. Wu, C. Zhang, J. Ma,* C. Wang,* W. Hu, Regulating the Solvation Sheath of Li Ions by Hydrogen Bonds for Highly Stable Lithium-Metal Anodes. Angew. Chem. Int. Ed. 2021, DOI: 10.1002/anie.202101976.
原文链接：https://onlinelibrary.wiley.com/doi/10.1002/anie.202101976
Abstract: Lithium is regarded as the most promising candidate for anodes in batteries. However, the performance of Li anode is extremely affected by the solvation of Li ions, leading to preferential reduction of the solvation sheath and subsequent formation of fragile solid-electrolyte interphase (SEI), Li dendrites and low coulombic efficiency (CE). Here, we propose a novel strategy to regulate the solvation sheath, through introducing intermolecular hydrogen bonds with both the anions of Li salt and the solvent by small amount additives. The addition of such hydrogen bonds reduced the LUMO energy level of anions in electrolyte, promoted the formation of robust SEI, reduced the amount of free solvent molecules and enhanced stability of electrolytes. Based on this strategy, flat and dense lithium deposition was obtained. Even under lean electrolytes, at a current density of 1 mA cm-2 with a fixed capacity of 3 mAh cm-2, the Li-Cu cells showed impressive CE of 99.2%. The Li-LiFePO4 full cells showed long-term cycling stability for more than 1000 cycles at 1C, with a total capacity loss of only 15 mAh g-1.
