A closed-host bi-layer dense/porous solid electrolyte interphase for enhanced lithium-metal anode stability |
| |
| Affiliation: | 1. Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, China;2. Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing 100081, China;1. National & Local United Engineering Laboratory for Power Battery, Department of Chemistry, Northeast Normal University Changchun, 130024, China;2. Department of Mechanical and Materials Engineering, University of Western Ontario, London, ON N6A 5B9, Canada;1. Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Engineering Research Center of Electrochemical Technologies of Ministry of Education, Xiamen University, Xiamen 361005, China;2. College of Mechanical and Energy Engineering, Jimei University, Xiamen, Fujian 361021, China;3. College of Chemical Engineering and Materials Science, Quanzhou Normal University, Quanzhou, Fujian 362000, China;1. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;2. Department of Mechanical and Materials Engineering, University of Western Ontario, London ON N6A 5B9, Canada;3. Key Laboratory of Optoelectronic Chemical Materials and Devices, School of Chemical and Environmental Engineering, Jianghan University, Wuhan 430056, China;4. Tianmu Lake Institute of Advanced Energy Storage Technologies, Liyang 213300, China |
| |
| Abstract: | Thanks to its high specific capacity and low electrochemical potential, lithium metal is an ideal anode for next-generation high-energy batteries. However, the unstable heterogeneous surface of lithium gives rise to safety and efficiency concerns that prevent it from being utilized in practical applications. In this work, the formation of a closed-host bi-layer solid electrolyte interphase (SEI) improves the stability of lithium metal anode. This is successfully realized by forming an interconnected porous LiF-rich artificial SEI in contact with Li metal, and a dense, stable in-situ formed upper layer SEI. The porous layer increases the number of Li/LiF interfaces, which reduces local volume fluctuations and improves Li+ diffusion along these interfaces. Additionally, the tortuous porous structure guides uniform Li+ flux distribution and mechanically suppresses dendrite propagation. The dense upper layer of the SEI accomplishes a closed-host design, preventing continuous consumption of active materials. The duality of a dense top layer with porous bottom layer led to extended cycle life and improved rate performance, evidenced with symmetric cell testing, as well as full cell testing paired with sulfur and LiFePO4 (LFP) cathodes. This work is a good example of a rational design of the SEI, based on comprehensive consideration of various critical factors to improve Li-metal anode stability, and highlights a new pathway to improve cycling and rate performances of Li metal batteries. |
| |
| Keywords: | Li-metal batteries Artificial solid-electrolyte interphase Closed-host design |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
