Lithium–Iron (III) Fluoride Battery with Double Surface Protection
[1];
- School of Chemistry and Biochemistry Georgia Institute of Technology Atlanta GA 30332 USA
- Electrochemistry Branch Sensor and Electron Devices Directorate Power and Energy Division U.S. Army Research Laboratory Adelphi MD 20783 USA
- School of Chemical and Biomolecular Engineering Georgia Institute of Technology Atlanta GA 30318 USA
- School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA 30326 USA, Engineering Laboratory for the Next Generation Power and Energy Storage Batteries Graduate School at Shenzhen Tsinghua University Shenzhen 518055 P. R. China
- School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA 30326 USA
- School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA 30326 USA, School of Chemistry and Chemical Engineering Chongqing University Chongqing 400044 China
- School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA 30326 USA, School of Physical Science and Technology Lanzhou University Lanzhou 730000 China
Abstract Lithium–metal fluoride batteries promise significantly higher energy density than the state‐of‐the‐art lithium‐ion batteries and lithium–sulfur batteries. Unfortunately, commercialization of metal fluoride cathodes is prevented by their high resistance, irreversible structural change, and rapid degradation. In this study, a substantial boost in metal fluoride (MF) cathode stability by designing nanostructure with two layers of protective shells—one deposited ex situ and the other in situ is demonstrated. Such methodology achieves over 90% capacity retention after 300 charge–discharge cycles, producing the first report on FeF 3 as a cathode material, where a very high capacity utilization in combination with excellent stability is approaching the level needed for practical applications of FeF 3 . The cathode solid electrolyte interphase (CEI) containing lithium oxalate and BF bond containing anions is found to effectively protect the cathode material from direct contact with electrolytes, thus greatly suppressing the dissolution of Fe. Quantum chemistry and molecular dynamics calculations provide unique insights into the mechanisms of CEI layer formation. As a result, this work not only demonstrates unprecedented performance, but also provides the reader with a better fundamental understanding of electrochemical behavior of MF cathodes and the positive impact observed with the application of a lithium bis(oxalato)borate salt in the electrolyte.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 1460889
- Journal Information:
- Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 26 Vol. 8; ISSN 1614-6832
- Publisher:
- Wiley Blackwell (John Wiley & Sons)Copyright Statement
- Country of Publication:
- Germany
- Language:
- English
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