Title: High‐Performance Lithium Metal Batteries Enabled by a Fluorinated Cyclic Ether with a Low Reduction Potential

Journal Article · · Angewandte Chemie
ORCiD logo [1];  [1];  [2];  [3];  [4];  [4];  [4];  [3]; ORCiD logo [5]
  1. Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA
  2. Department of Materials Science &, Engineering University of Maryland College Park MD 20742 USA
  3. Department of Chemistry University of Rhode Island Kingston RI 02881 USA
  4. Department of Chemistry and Biochemistry University of Maryland College Park MD 20742 USA
  5. Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USA, Department of Materials Science &, Engineering University of Maryland College Park MD 20742 USA

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 0.8 Mn 0.1 Co 0.1 O 2 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.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1909950
Journal Information:
Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 8 Vol. 135; ISSN 0044-8249
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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