Gradient Solid Electrolyte Interphase and Lithium‐Ion Solvation Regulated by Bisfluoroacetamide for Stable Lithium Metal Batteries,Angewandte Chemie International Edition

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Gradient Solid Electrolyte Interphase and Lithium‐Ion Solvation Regulated by Bisfluoroacetamide for Stable Lithium Metal Batteries
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-12-11 , DOI: 10.1002/anie.202013993
Jianmin Ma ₁ , Fang Li ₂ , Jian He ₂ , Jiandong Liu ₂ , Mingguang Wu ₂ , Yuyang Hou ₃ , Huaping Wang ₂ , Shihan Qi ₂ , Quanhui Liu ₂ , Jiawen Hu ₄

Affiliation

The structures and components of solid electrolyte interphase (SEI) are extremely important to influence the performance of full cells, which is determined by the formulation of electrolyte used. However, it is still challenging to control the formation of high‐quality SEI from structures to components. Herein, we designed bisfluoroacetamide (BFA) as the electrolyte additive for the construction of a gradient solid electrolyte interphase (SEI) structure that consists of a lithophilic surface with C−F bonds to uniformly capture Li ions and a LiF‐rich bottom layer to guide the rapid transportation of Li ions, endowing the homogeneous deposition of Li ions. Moreover, the BFA molecule changes the Li⁺ solvation structure by reducing free solvents in electrolyte to improve the antioxidant properties of electrolyte and prevent the extensive degradation of electrolyte on the cathode surface, which can make a superior cathode electrolyte interphase (CEI) with high‐content LiF.

中文翻译：

稳定的锂金属电池用双氟乙酰胺调节梯度固体电解质的界面和锂离子溶剂化

固体电解质中间相（SEI）的结构和成分对于影响整个电池的性能极为重要，这由所用电解质的配方决定。但是，控制从结构到组件的高质量SEI的形成仍然具有挑战性。本文中，我们设计了双氟乙酰胺（BFA）作为电解质添加剂，用于构建梯度固体电解质相间（SEI）结构，该结构由具有C-F键的亲石性表面组成，以均匀地捕获锂离子，并通过富LiF底层引导锂离子的快速传输，赋予锂离子均匀的沉积。此外，BFA分子会改变Li ⁺ 通过减少电解质中的游离溶剂来提高电解质的抗氧化性能并防止电解质在阴极表面上的大量降解，从而形成具有高含量LiF的优异阴极电解质中间相（CEI）的溶剂化结构。

更新日期：2020-12-11

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