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Fluorine-Substituted Lithium Chloride Solid Electrolytes for High-Voltage All-Solid-State Lithium-Ion Batteries

Journal Article · · ACS Energy Letters
 [1];  [2];  [3];  [3];  [1];  [4]
  1. Korea Institute of Science and Technology (KIST), Seoul (Korea, Republic of). Computational Science Research Center
  2. Korea Institute of Science and Technology (KIST), Seoul (Korea, Republic of). Energy Storage Research Center
  3. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  4. Korea Institute of Science and Technology (KIST), Seoul (Korea, Republic of). Energy Storage Research Center; Korea University of Science and Technology, Seoul (Korea, Republic of)
Lithium ternary halides are promising solid electrolytes, owing to their high ionic conductivity and reasonably high oxidative and chemical stability. Recently, fluorine substitution in Li3MCl6 has been suggested as a promising approach for further enhancing oxidation stability. Accordingly, this study outlines a material design strategy for F-substituted Li3MCl6 through systematic theoretical analyses. Calculations reveal that the mixing limit of F in Li3MCl6–xFx is in the range of 0.5–1.5, and the resulting Li3MCl6–xFx phases can retain ionic conductivity above 1 mS/cm up to x = 1.0. Additionally, the calculations also predict that the formation of F-containing passivating phases could increase the oxidation potential for Li3MCl5F to ~6.3 V. The proposed material design strategy is validated through the synthesis of Li3YCl5F, which is confirmed to show both high ionic conductivity and enhanced oxidation stability. The design guidelines presented herein can accelerate the potential use of halide-based electrolyte chemistries in high-voltage all-solid-state batteries.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO); Korea Institute of Science and Technology (KIST); National Research Foundation (NRF), Korea; Ministry of Trade, Industry & Energy of Korea
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
2309844
Report Number(s):
LLNL--JRNL-854279; 1082487
Journal Information:
ACS Energy Letters, Journal Name: ACS Energy Letters Journal Issue: 1 Vol. 9; ISSN 2380-8195
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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