Interface Engineering Toward Expedited Li2S Deposition in Lithium–Sulfur Batteries: A Critical Review

Lithium–sulfur batteries (LSBs) with superior energy density are among the most promising candidates of next‐generation energy storage techniques. As the key step contributing to 75% of the overall capacity, Li2S deposition remains a formidable challenge for LSBs applications because of its sluggish...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2023-07, Vol.35 (29), p.n/a
Main Authors: Sun, Jinmeng, Liu, Yuhang, Liu, Lei, Bi, Jingxuan, Wang, Siying, Du, Zhuzhu, Du, Hongfang, Wang, Ke, Ai, Wei, Huang, Wei
Format: Article
Language:English
Subjects:
Catholytes
Critical field (superconductivity)
Deposition
Electrolytes
electrolyte–Li2S interface
electrolyte–substrate interface
Energy storage
interface engineering
Interfaces
Li2S deposition
Lithium sulfur batteries
Materials science
Metal compounds
Optimization
Organic compounds
redox kinetics
Substrates
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Summary:Lithium–sulfur batteries (LSBs) with superior energy density are among the most promising candidates of next‐generation energy storage techniques. As the key step contributing to 75% of the overall capacity, Li2S deposition remains a formidable challenge for LSBs applications because of its sluggish kinetics. The severe kinetic issue originates from the huge interfacial impedances, indicative of the interface‐dominated nature of Li2S deposition. Accordingly, increasing efforts have been devoted to interface engineering for efficient Li2S deposition, which has attained inspiring success to date. However, a systematic overview and in‐depth understanding of this critical field are still absent. In this review, the principles of interface‐controlled Li2S precipitation are presented, clarifying the pivotal roles of electrolyte–substrate and electrolyte–Li2S interfaces in regulating Li2S depositing behavior. For the optimization of the electrolyte–substrate interface, efforts on the design of substrates including metal compounds, functionalized carbons, and organic compounds are systematically summarized. Regarding the regulation of electrolyte–Li2S interface, the progress of applying polysulfides catholytes, redox mediators, and high‐donicity/polarity electrolytes is overviewed in detail. Finally, the challenges and possible solutions aiming at optimizing Li2S deposition are given for further development of practical LSBs. This review would inspire more insightful works and, more importantly, may enlighten other electrochemical areas concerning heterogeneous deposition processes. Li2S deposition, the final discharge step contributing 75% capacity to Li–S batteries, remains a formidable issue due to its sluggish kinetics. The inferior deposition kinetics stem from the huge interfacial impedances, suggesting its interface‐dominated nature. In this review, the progress and outlook of interface engineering for Li2S deposition, associated with the underlying mechanisms and potential problem‐solving strategies, are reviewed.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.202211168