High-Performance Lithium Metal Batteries Enabled by a Fluorinated Cyclic Ether with a Low Reduction Potential

Authors

Min Wu
Zeyi Wang
Weiran Zhang
Chamithri Jayawardana, University of Rhode Island
Yue Li
Fu Chen
Bo Nan
Brett L. Lucht, University of Rhode IslandFollow
Chunsheng Wang

Document Type

Article

Date of Original Version

2023

Department

Chemistry

Abstract

Electrolyte engineering is crucial for developing high-performance lithium metal batteries (LMB). Here, we synthesized two cosolvents methyl bis(fluorosulfonyl)imide (MFSI) and 3,3,4,4-tetrafluorotetrahydrofuran (TFF) with significantly different reduction potentials and add them into LiFSI-DME electrolytes. The LiFSI/TFF-DME electrolyte gave an average Li Coulombic efficiency (CE) of 99.41 % over 200 cycles, while the average Li CEs for MFSI-based electrolyte is only 98.62 %. Additionally, the TFF-based electrolytes exhibited a more reversible performance than the state-of-the-art fluorinated 1,4-dimethoxylbutane electrolyte in both Li||Cu half-cell and anode-free Cu||LiNi_0.8Mn_0.1Co_0.1O₂ full cell. More importantly, the decomposition product from bis(fluorosulfonyl)imide anion could react with ether solvent, which destroyed the SEI, thus decreasing cell performance. These key discoveries provide new insights into the rational design of electrolyte solvents and cosolvents for LMB.

[PDF also includes a graphical abstract]

Publication Title, e.g., Journal

Angewandte Chemie International Edition

Volume

62

Issue

8

Citation/Publisher Attribution

Wu, M., Wang, Z., Zhang, W., Jayawardana, C., Li, Y., Chen, F.,...Wang, C. (2023). High-Performance Lithium Metal Batteries Enabled by a Fluorinated Cyclic Ether with a Low Reduction Potential. Angewandte Chemie International Edition, 62(8), e202216169. https://doi.org/10.1002/anie.202216169

Available at: https://doi.org/10.1002/anie.202216169

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