Molecular Engineering Toward Robust Solid Electrolyte Interphase for Lithium Metal Batteries

Abstract

Lithium‐metal batteries (LMBs) with high energy density are becoming increasingly important in global sustainability initiatives. However, uncontrollable dendrite seeds, inscrutable interfacial chemistry, and repetitively formed solid electrolyte interphase (SEI) have severely hindered the advancement of LMBs. Organic molecules have been ingeniously engineered to construct targeted SEI and effectively minimize the above issues. In this review, we comprehensively summarize multiple organic molecules, including polymer, fluorinated molecules, and organosulfur, and provide insights into how to construct the corresponding elastic, fluorine‐rich, and organosulfur‐containing SEIs. A variety of meticulously selected cases are analyzed in depth to support the arguments of molecular design in SEI. Specifically, we discuss the evolution of organic molecules‐derived SEI and propose corresponding design principles, which is beneficial in guiding researchers to understand and architect SEI based on organic molecules. Our review provides a design guideline for constructing organic molecule‐derived SEI and will inspire more researchers to concentrate on the exploitation of LMBs.

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