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Gu, Yu; You, En-Ming; Lin, Jian-De; Wang, Jun-Hao; Luo, Si-Heng; Zhou, Ru-Yu; Zhang, Chen-Jie; Yao, Jian-Lin; Li, Hui-Yang; Li, Gen; Wang, Wei-Wei; Qiao, Yu; Yan, Jia-Wei; Wu, De-Yin; Liu, Guo-Kun; Zhang, Li; Li, Jian-Feng; Xu, Rong; Tian, Zhong-Qun; Cui, Yi; Mao, Bing-Wei
Nature communications, 06/2023, Volume: 14, Issue: 1Journal Article
The solid-electrolyte interphase (SEI) plays crucial roles for the reversible operation of lithium metal batteries. However, fundamental understanding of the mechanisms of SEI formation and evolution is still limited. Herein, we develop a depth-sensitive plasmon-enhanced Raman spectroscopy (DS-PERS) method to enable in-situ and nondestructive characterization of the nanostructure and chemistry of SEI, based on synergistic enhancements of localized surface plasmons from nanostructured Cu, shell-isolated Au nanoparticles and Li deposits at different depths. We monitor the sequential formation of SEI in both ether-based and carbonate-based dual-salt electrolytes on a Cu current collector and then on freshly deposited Li, with dramatic chemical reconstruction. The molecular-level insights from the DS-PERS study unravel the profound influences of Li in modifying SEI formation and in turn the roles of SEI in regulating the Li-ion desolvation and the subsequent Li deposition at SEI-coupled interfaces. Last, we develop a cycling protocol that promotes a favorable direct SEI formation route, which significantly enhances the performance of anode-free Li metal batteries.
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