锂金属负极在液体和固体电解质中的界面问题和固体电解质界面改性,Advanced Energy Materials

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锂金属负极在液体和固体电解质中的界面问题和固体电解质界面改性
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-02-24 , DOI: 10.1002/aenm.202203791
Oh B. Chae ₁ , Brett L. Lucht ₂

Affiliation

下一代锂电池所需的高能量密度可能会通过从传统的基于插层的阳极（例如石墨）转向锂金属阳极来实现。然而，锂金属面临的几个关键挑战源于其高反应性，沉积和剥离的无宿主反应阻碍了锂金属作为负极的实际应用。固体电解质界面 (SEI) 的作用对于锂金属负极非常重要，SEI 必须保护锂金属动态变化的表面。由于两种不同电解质系统（液体和固体）的 SEI 生成反应机制有很大不同，因此在两种电解质系统中，锂金属和电解质之间形成的 SEI 层具有显着不同的性质，导致不同的界面问题。界面问题的抑制需要不同的策略来增强每个电解质系统的 SEI 层。然而，在现有文献中尚未明确比较这两种电解质系统的差异。在本报告中，比较了两种不同电解质系统的界面问题，并提供了不同的 SEI 改性策略来克服这些问题。

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Interfacial Issues and Modification of Solid Electrolyte Interphase for Li Metal Anode in Liquid and Solid Electrolytes

The high energy density required for the next generation of lithium batteries will likely be enabled by a shift toward lithium metal anode from the conventional intercalation-based anode such as graphite. However, several critical challenges for Li metal originate from its highly reactive nature and the hostless reaction of deposition and stripping impede the practical use of Li metal as an anode. The role of the solid electrolyte interphase (SEI) is very important for the Li metal anode where the SEI must protect the dynamically changing surface of the Li metal. Since the SEI-generating reaction mechanisms for the two different electrolyte systems, liquid and solid, are considerably different, the SEI layers formed between the Li metal and the electrolytes in the two electrolyte systems have substantially different properties, causing different interfacial issues. Inhibition of the interfacial problems requires different strategies to reinforce the SEI layer for each of the electrolyte systems. However, the differences in the two electrolyte systems have not been clearly compared in the prior literature. In this report, the interfacial issues for the two different electrolyte systems are compared and different strategies for SEI modification are provided to overcome the issues.

更新日期：2023-02-24

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