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Reaction mechanism studies towards effective fabrication of lithium-rich anti-perovskites Li3OX (X= Cl, Br)
- Source :
- Solid State Ionics. 284:14-19
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- Lithium-rich anti-perovskites (LiRAPs), with general formula Li3OX (X = Cl, Br), recently reported as superionic conductors with 3-dimensional Li+ migrating channels, are emerging as promising candidates for solid electrolytes in all-solid-state lithium-ion batteries (LIBs). However, great challenges remain in the fabrication of pure LiRAPs due to difficulties such as low yield, impurity phases, thermodynamic instabilities, and moisture-sensitivity. In this work, we thoroughly studied the formation mechanism of Li3OCl and Li3OBr using various solid-state reaction routes. Different experimental strategies were developed to improve the syntheses, namely, for the purposes of phase stability, phase purity, and large-scale production. One feasible method is to use the strong reducing agents Li metal or LiH to eliminate the OH species. The results show that LiH is more effective than Li metal, mainly due to negatively charged H− and reaction uniformity. The other successful method employs a solid diffusion approach using Li2O and LiX as the starting reagents, thereby avoiding OH entirely; ball milling of reagents under Ar atmosphere was utilized to decrease initial grain size and increase the reaction rate. Fourier transform infrared spectroscopy (FTIR), thermal analyses, and first-principles calculations were performed to give indications on the reaction pathway.
- Subjects :
- Reaction mechanism
Chemistry
Inorganic chemistry
chemistry.chemical_element
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Lithium-ion battery
0104 chemical sciences
Reaction rate
Impurity
Yield (chemistry)
Fast ion conductor
General Materials Science
Lithium
Fourier transform infrared spectroscopy
0210 nano-technology
Subjects
Details
- ISSN :
- 01672738
- Volume :
- 284
- Database :
- OpenAIRE
- Journal :
- Solid State Ionics
- Accession number :
- edsair.doi...........ac119eb05eb62821824a2679d18fe1d3