期刊
JOURNAL OF MATERIALS SCIENCE
卷 54, 期 15, 页码 10571-10594出版社
SPRINGER
DOI: 10.1007/s10853-019-03633-2
关键词
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资金
- Center for Nanophase Materials Sciences, DOE Office of Science User Facility
- US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division
- National Science Foundation [DGE-1650044]
Solid electrolytes (SEs) have gained increased attention for their promise to enable higher volumetric energy density and enhanced safety required for future battery systems. SEs are not only a key constituent in all-solid-state batteries, but also important protectors of Li metal anodes in next-generation battery configurations, such as Li-air, Li-S, and redox flow batteries. The impedance at interfaces associated with SEs, e.g., internal grain/phase boundaries and their interfacial stability with electrodes, represents two key factors limiting the performance of SEs, yet analyzing these interfaces experimentally at the nano/atomic scale is generally challenging. A mechanistic understanding of the possible instability at interfaces and propagation of interfacial resistance will pave the way to the design of high-performance SE-based batteries. In this review, we briefly introduce the fundamentals of SEs and challenges associated with their interfaces. Next, we discuss experimental techniques that allow for atomic-to-microscale understanding of ion transport and stability in SEs and at their interfaces, specifically highlighting the applications of state-of-the-art and emerging ex situ and in situ transmission electron microscopy (TEM) and scanning TEM (STEM). Representative examples from the current literature that exemplify recent fundamental insights gained from these S/TEM techniques are highlighted. Applicable strategies to improve ion conduction and interfaces in SE-based batteries are also discussed. This review concludes by highlighting opportunities for future research that will significantly promote the fundamental understanding of SEs, specifically further developments in S/TEM techniques that will bring new insights into the design of high-performance interfaces for future electrical energy storage.
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