The ionic conductivity of LiZr₂(PO₄)₃ (LZP), a NASICON-type electrolyte, can be altered by doping, annealing temperature, and pressure. In this study, the rhombohedral framework of Li_1+xAl_xZr_2-x(PO₄)₃ (LAZP, x = 0.1–0.9) solid electrolyte, for application in Li-air batteries, are synthesized using a facile solid-state reaction. A systematic dual effect of dopant and annealing environment on the grain boundary resistance, ionic conductivity, and ions diffusion are investigated for this electrolyte. With the substitution of Al³⁺, the rhombohedral solid electrolyte structure synthesized in various environments becomes stable at room temperature due to additional Li⁺ ions and provides high ionic conductivity. LAZP ionic conductivity is 4 times higher than that of LiZr₂(PO₄)₃ at room temperature due to the formation of a high-temperature-stable phase by Al doping. Additionally, the solid electrolyte properties significantly depended on the synthesis environment; the maximum ionic conductivity and Li-ion mobility are observed for Li_1.3Al_0.3Zr_1.7(PO₄)₃ solid electrolyte synthesized in an oxygen environment.

中文翻译：

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NASICON型LiZr 2（PO 4）3固体电解质的退火环境和Al掺杂效应的系统研究

NASICON型电解质LiZr ₂（PO ₄）₃（LZP）的离子电导率可通过掺杂，退火温度和压力来改变。在这项研究中，使用方便的 固体电池合成了用于锂空气电池的Li _{1 + x} Al _x Zr _2-x（PO ₄）₃（LAZP，x = 0.1-0.9）的菱形框架。状态反应。研究了该掺杂剂和退火环境对晶界电阻，离子电导率和离子扩散的系统双重影响。用Al ³⁺代替，由于附加的Li ⁺离子，在各种环境中合成的菱面体固体电解质结构在室温下变得稳定，并提供高离子电导率。由于通过Al掺杂形成高温稳定相，因此在室温下，LAZP离子电导率是LiZr ₂（PO ₄）_3的4倍。另外，固体电解质的性质在很大程度上取决于合成环境。对于在氧气环境中合成的Li _1.3 Al _0.3 Zr _1.7（PO ₄）₃固体电解质，观察到最大离子电导率和Li离子迁移率。