Abstract NASICON-type electrolyte is one of the possible solid-state electrolytes to be employed in solid-state energy devices. The Li1+xAlxSn2-xP3O12 NASICON-based solid electrolyte materials were fabricated using the mechanochemical milling method at 650 oC for 8 h, where x is from 0 to 0.8. From the X-ray diffraction (XRD) analysis, the crystallographic phases of the parent material and of the partial aluminium (Al) substituted one have been verified. Site occupancy factor (s.o.f) studies from the XRD data refinement illustrate that the material with x = 0.4 has a stoichiometry in good agreement with the norminal tin (Sn):aluminium (Al) ratio which is 8:2. Field emission scanning electron microscopy (FESEM) study was conducted to study the surface morphological properties revealing the homogenous single-crystalline structure in the sample with x = 0.4, which consists of particles of the smallest crystallite size of 3.77 nm among the investigated. The process of partial Al-substitution was further confirmed by the energy dispersive X-ray (EDX). The material with x = 0.4 possesses the maximum conductivity value of 7.57 × 10-6 S∙cm-1, which was improved up to 3.79 × 10-5 S∙cm-1 by a silver paint treatment. The correlation between the microstructure and the ionic conductivity has been explained via the EDX and impedance analysis results. Ions were found to be the main charge carriers from the transference number analysis (TNM). Variation of relaxation in the dielectric study verifies that Li1+xAlxSn2-xP3O12 obeys non-Debye characteristic. Patterns of dielectric results strengthened the trend of ionic conductivity.

中文翻译：

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通过铝替代增强 NASICON 型固体电解质 (LiSn2P3O12) 的电性能

摘要 NASICON 型电解质是可能用于固态能源设备的固态电解质之一。Li1+xAlxSn2-xP3O12 NASICON 基固体电解质材料是使用机械化学研磨方法在 650 oC 下经过 8 小时制备的，其中 x 为 0 到 0.8。通过 X 射线衍射 (XRD) 分析，母体材料和部分铝 (Al) 替代物的结晶相已得到验证。来自 XRD 数据精修的场地占用因子 (sof) 研究表明，x = 0.4 的材料的化学计量与正常的锡 (Sn): 铝 (Al) 比为 8:2 非常吻合。进行场发射扫描电子显微镜 (FESEM) 研究以研究表面形态特性，揭示样品中 x = 0.4 的均匀单晶结构，其由所研究的最小晶粒尺寸为 3.77 nm 的颗粒组成。能量色散 X 射线 (EDX) 进一步证实了部分铝取代的过程。x = 0.4 的材料的最大电导率为 7.57 × 10-6 S∙cm-1，通过银漆处理提高到 3.79 × 10-5 S∙cm-1。微观结构和离子电导率之间的相关性已经通过 EDX 和阻抗分析结果进行了解释。从转移数分析 (TNM) 中发现离子是主要的电荷载体。介电研究中弛豫的变化证实 Li1+xAlxSn2-xP3O12 服从非德拜特性。介电结果的模式加强了离子电导率的趋势。