Enhanced ionic conductivity with Li7O2Br3 phase in Li3OBr anti-perovskite solid electrolyte
- Univ. of Nevada, Las Vegas, NV (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Univ. of Texas at Austin, Austin, TX (United States)
- Univ. of Nevada, Las Vegas, NV (United States); South Univ. of Science and Technology of China, Guangdong (China)
Here, cubic anti-perovskites with general formula Li3OX (X = Cl, Br, I) were recently reported as superionic conductors with the potential for use as solid electrolytes in all-solid-state lithium ion batteries. These electrolytes are nonflammable, low-cost and suitable for thermoplastic processing. However, the primary obstacle of its practical implementation is the relatively low ionic conductivity at room temperature. In this work, we synthesized a composite material consisting of two anti-perovskite phases, namely cubic Li3OBr and layered Li7O2Br3, by solid state reaction routes. The results indicate that with the phase fraction of Li7O2Br3 increasing to 44 wt %, the ionic conductivity increased by more than one order of magnitude compared with pure phase Li3OBr. Formation energy calculations revealed the meta-stable nature of Li7O2Br3, which supports the great difficulty in producing phase-pure Li7O2Br3 at ambient pressure. Methods of obtaining phase-pure Li7O2Br3 will continue to be explored, including both high pressure and metathesis techniques.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Univ. of Nevada, Las Vegas, NV (United States)
- Sponsoring Organization:
- USDOE Advanced Research Projects Agency - Energy (ARPA-E)
- Grant/Contract Number:
- AC52-06NA25396; NA0001982; 0670-3052
- OSTI ID:
- 1331273
- Alternate ID(s):
- OSTI ID: 1332396; OSTI ID: 1420460
- Report Number(s):
- LA-UR-16-21222; APPLAB
- Journal Information:
- Applied Physics Letters, Vol. 109, Issue 10; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Promises, Challenges, and Recent Progress of Inorganic Solid-State Electrolytes for All-Solid-State Lithium Batteries
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journal | February 2018 |
Ion Conductivity Enhancement in Anti-Spinel Li 3 OBr with Intrinsic Vacancies
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journal | November 2018 |
Correlating lattice distortions, ion migration barriers, and stability in solid electrolytes
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journal | January 2019 |
Insights into Grain Boundary in Lithium-Rich Anti-Perovskite as Solid Electrolytes
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journal | January 2018 |
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