Reaction mechanism studies towards effective fabrication of lithium-rich anti-perovskites Li3OX (X=Cl, Br)
- Univ. of Nevada, Las Vegas, NV (United States). High Pressure Science and Engineering Center
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies and Earth and Environmental Sciences Division
- Univ. of Texas, Austin, TX (United States). Materials Research Program and the Texas Materials Inst.
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source
Lithium-rich Anti-perovskite (LiRAP), with general formula Li3OX (X = Cl, Br, I), and recently reported as superionic conductors with 3-dimensional Li+ migrating channels, is emerging as a promising candidate for solid electrolyte of all-solid-state LIBs. But, it is still difficult to fabricate pure LiRAP due to the difficulty of the phase formation and moisture-sensitive nature of the products. In this work, we thoroughly studied the formation mechanism of Li3OCl and Li3OBr in various solid state reaction routes. We developed different experimental strategies in order to improve the syntheses, in purposes of improved phase stability and large-scale production of LiRAP. One feasible method is to use strongly reductive agents Li metal or LiH to eliminate OH species. The results show that LiH is more effective than Li metal because of negatively charged H- and uniform reaction. The other well-established method is using Li2O and LiX mixture as reagents to preventing OH phase at the beginning, and using protected ball milling to make fine powders and hence active the reaction. Finally, IR spectroscopy, thermal analyses and first-principle calculation were performed to give indications on the reaction pathway.
- Research Organization:
- Univ. of Nevada, Las Vegas, NV (United States)
- Sponsoring Organization:
- USDOE Advanced Research Projects Agency - Energy (ARPA-E)
- Grant/Contract Number:
- NA0001982; 0670-3052
- OSTI ID:
- 1332343
- Alternate ID(s):
- OSTI ID: 1359886
- Journal Information:
- Solid State Ionics, Vol. 284, Issue C; ISSN 0167-2738
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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