Wu Yue, Wang Ce, Wang Chengjie, Zhang Yan, Liu Jingbing, Jin Yuhong, Wang Hao, Zhang Qianqian
Key Laboratory for New Functional Materials of Ministry of Education, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, P. R. China.
Mater Horiz. 2024 Jan 22;11(2):388-407. doi: 10.1039/d3mh01434g.
Lithium metal anodes (LMAs) are ideal anode candidates for achieving next-generation high-energy-density battery systems due to their high theoretical capacity (3680 mA h g) and low working potential (-3.04 V the standard hydrogen electrode). However, the non-ideal solid electrolyte interface (SEI) derived from electrolyte/electrode interfacial reactions plays a vital role in the lithium deposition/stripping process and battery cycling performance. The composition and morphology of a SEI, which is sensitive to the outside environment, make it difficult to characterize and understand. With the development of characterization techniques, the mechanism, composition, and structure of a SEI can be better understood. In this review, the mechanism formation, the structure model evolution, and the composition of a SEI are briefly presented. Moreover, the development of characterization techniques in recent years is introduced to better understand a SEI followed by the properties of the SEI, which are beneficial to the battery performance. Furthermore, recent optimization strategies of the SEI including the improvement of intrinsic SEIs and construction of artificial SEIs are summarized. Finally, the current challenges and future perspectives of SEI research are summarized.
锂金属阳极（LMA）因其高理论容量（3680 mA h g）和低工作电位（相对于标准氢电极-3.04 V），是实现下一代高能量密度电池系统的理想阳极候选材料。然而，由电解质/电极界面反应产生的不理想的固体电解质界面（SEI）在锂沉积/剥离过程和电池循环性能中起着至关重要的作用。SEI的组成和形态对外部环境敏感，这使得其难以表征和理解。随着表征技术的发展，SEI的形成机理、组成和结构能得到更好的理解。在这篇综述中，简要介绍了SEI的形成机理、结构模型演变和组成。此外，还介绍了近年来表征技术的发展，以便更好地理解SEI，随后阐述了SEI的性质，这些性质对电池性能有益。此外，总结了近期SEI的优化策略，包括本征SEI的改进和人工SEI的构建。最后，总结了SEI研究当前面临的挑战和未来展望。
