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Title: Enhanced ionic conductivity with Li{sub 7}O{sub 2}Br{sub 3} phase in Li{sub 3}OBr anti-perovskite solid electrolyte

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.4962437· OSTI ID:22594290
; ; ; ; ; ;  [1];  [2];  [3];  [1]
  1. High Pressure Science and Engineering Center, University of Nevada, Las Vegas, Nevada 89154 (United States)
  2. Center for Integrated Nanotechnologies and Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
  3. Materials Research Program and The Texas Materials Institute, University of Texas at Austin, Texas 78712 (United States)

Cubic anti-perovskites with general formula Li{sub 3}OX (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 Li{sub 3}OBr and layered Li{sub 7}O{sub 2}Br{sub 3,} by solid state reaction routes. The results indicate that with the phase fraction of Li{sub 7}O{sub 2}Br{sub 3} increasing to 44 wt. %, the ionic conductivity increased by more than one order of magnitude compared with pure phase Li{sub 3}OBr. Formation energy calculations revealed the meta-stable nature of Li{sub 7}O{sub 2}Br{sub 3}, which supports the great difficulty in producing phase-pure Li{sub 7}O{sub 2}Br{sub 3} at ambient pressure. Methods of obtaining phase-pure Li{sub 7}O{sub 2}Br{sub 3} will continue to be explored, including both high pressure and metathesis techniques.

OSTI ID:
22594290
Journal Information:
Applied Physics Letters, Vol. 109, Issue 10; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
Country of Publication:
United States
Language:
English

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Cited By (4)

Promises, Challenges, and Recent Progress of Inorganic Solid-State Electrolytes for All-Solid-State Lithium Batteries journal February 2018
Ion Conductivity Enhancement in Anti-Spinel Li 3 OBr with Intrinsic Vacancies journal November 2018
Correlating lattice distortions, ion migration barriers, and stability in solid electrolytes journal January 2019
Insights into Grain Boundary in Lithium-Rich Anti-Perovskite as Solid Electrolytes journal January 2018