From Mosaic-Type to Heterojunction-Type SEI Films on the Li Anode: Decoupling Chemical and Electrochemical Degradation of the Electrolyte,ACS Sustainable Chemistry & Engineering

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From Mosaic-Type to Heterojunction-Type SEI Films on the Li Anode: Decoupling Chemical and Electrochemical Degradation of the Electrolyte
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2022-07-05 , DOI: 10.1021/acssuschemeng.2c02668
Jiaxiang Liu ₁ , Nanbiao Pei ₁ , Haiming Hua ₂ , Yi Deng ₁ , Haoshen Ma ₁ , Peng Zhang ₁ , Jinbao Zhao _{1,

3}

Affiliation

The solid electrolyte interphase (SEI) film is vital to the plating/stripping behavior of lithium metal, while the formation mechanism has not been explained clearly. Here, the formation process of the SEI film is first classified into chemical and electrochemical degradation routes by introducing a LiZn alloy, a chemically inert but electrochemically reactive interphase, as a distinguished research substrate. In a carbonate electrolyte, it is found that the common inorganic matters (such as Li₂O and LiF) mainly originate from the chemical degradation of the electrolyte; meanwhile, the electrochemical degradation mainly generates organic species such as C-OR and COOR. Based on this understanding, the SEI film can be further accurately regulated, and a heterojunction-type SEI film with a well-defined composition and structure is constructed. This offers us a new perspective to understand and regulate the formation of the SEI film for applicable lithium metal batteries.

中文翻译：

从镶嵌型到锂负极上的异质结型 SEI 薄膜：电解液的化学和电化学降解去耦

固体电解质界面 (SEI) 膜对锂金属的电镀/剥离行为至关重要，而其形成机制尚未得到明确解释。在这里，SEI 膜的形成过程首先被分为化学和电化学降解途径，通过引入 LiZn 合金，一种化学惰性但具有电化学反应性的界面，作为一个杰出的研究基底。在碳酸盐电解质中，发现常见的无机物（如 Li ₂O和LiF)主要来源于电解液的化学降解；同时，电化学降解主要产生有机物，如C-OR和COOR。基于这种认识，可以进一步对SEI薄膜进行精确调控，构建出成分和结构明确的异质结型SEI薄膜。这为我们了解和规范适用锂金属电池的 SEI 膜的形成提供了新的视角。

更新日期：2022-07-05

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