Volume 133, Issue 12 pp. 6674-6682
Forschungsartikel

Gradient Solid Electrolyte Interphase and Lithium-Ion Solvation Regulated by Bisfluoroacetamide for Stable Lithium Metal Batteries

Fang Li

Fang Li

School of Physics and Electronics, Hunan University, Changsha, 410082 China

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Jian He

Jian He

School of Physics and Electronics, Hunan University, Changsha, 410082 China

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Jiandong Liu

Jiandong Liu

School of Physics and Electronics, Hunan University, Changsha, 410082 China

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Mingguang Wu

Mingguang Wu

School of Physics and Electronics, Hunan University, Changsha, 410082 China

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Yuyang Hou

Yuyang Hou

CSIRO Mineral Resources, Clayton, VIC, 3168 Australia

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Huaping Wang

Huaping Wang

School of Physics and Electronics, Hunan University, Changsha, 410082 China

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Shihan Qi

Shihan Qi

School of Physics and Electronics, Hunan University, Changsha, 410082 China

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Quanhui Liu

Quanhui Liu

School of Physics and Electronics, Hunan University, Changsha, 410082 China

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Jiawen Hu

Jiawen Hu

State Key Laboratory for Chemo/Biosensing and Chemometrics, and College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082 China

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Jianmin Ma

Corresponding Author

Jianmin Ma

School of Physics and Electronics, Hunan University, Changsha, 410082 China

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First published: 11 December 2020
Citations: 23

Abstract

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.

Conflict of interest

The authors declare no conflict of interest.

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