研究目的
Investigating the effects of Mg-doping on the composition-phase-structural stability and ionic conductivity of Li-La-zirconate (LLZO) based cubic garnet upon exposure to air, compared to Al-doping.
研究成果
Mg-doping stabilizes the cubic garnet structure of LLZO at room temperature and suppresses reactions with atmospheric species, leading to stable retention of Li-ion conductivity upon exposure to air. This is advantageous for the development and handling of solid-state Li-ion batteries with LLZO as the electrolyte.
研究不足
The exact mechanism by which Mg-doping suppresses the deleterious reactions of LLZO with atmospheric species is not fully understood. Further studies are needed to elucidate the reasons behind the suppression of reactions with atmospheric species in the presence of Mg as a dopant.
1：Experimental Design and Method Selection:
Mg-doped and Al-doped LLZO powders were synthesized via sol-gel route using high purity precursors. The precursors were dissolved in de-ionized water as per target stoichiometries, with 10% excess LiNO3 to compensate for Li-loss during calcination/sintering.
2：Sample Selection and Data Sources:
High purity LiNO3, La(NO3)
3：6H2O, ZrO(NO3)5H2O, Mg(NO3)6H2O, or Al(NO3)9H2O were used as precursors. List of Experimental Equipment and Materials:
ICP-AES analysis (SPECTRO Analytical Instruments GmbH), XRD (Rigaku Smartlab X-ray diffractometer), FTIR (Vertex 80 system), XPS (AXIS Supra, Kratos Analytical), dual-beam FIB/FEG-SEM (AurigaTM Compact, Carl Zeiss), AC impedance analyzer (Novocontrol Technologies).
4：Experimental Procedures and Operational Workflow:
The solution was stirred, evaporated to form gel, pre-calcined, calcined, ball-milled, dried, cold compacted, and sintered.
5：Data Analysis Methods:
Rietveld refinement of XRD patterns, fitting of impedance spectra with equivalent circuits.
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