PbF2-CaF2-KF体系中高导电性固体电解质：机械化学合成、电学性能、微观结构及稳定性

IF 3.3 4区材料科学 Q3 CHEMISTRY, PHYSICAL

Solid State Ionics Pub Date : 2025-10-10 DOI:10.1016/j.ssi.2025.117037

Qianlong Ji, Natalia A. Melnikova, Oleg V. Glumov, Igor V. Murin

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引用次数: 0

摘要

具有超高氟离子迁移率的萤石结构固溶体被广泛认为是一种有前途的固体电解质，可用于氟离子电池等固态电化学器件。本文采用机械化学合成法制备了pb_2 - caf_2 - kf体系的固溶体。采用x射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和高分辨率透射电子显微镜（HRTEM）研究了合成的固溶体的结构和形貌。用电化学阻抗谱（EIS）研究了样品的氟离子电导率。结果表明：结合低温短暂热处理，可获得离子电导率高达1.46 × 10−3 S/cm（20℃时）的荧光晶体结构固体电解质β-Pb0.75Ca0.2K0.05F1.95；

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Highly conductive solid electrolytes in the PbF2-CaF2-KF system: mechanochemical synthesis, electrical properties, microstructure and stability

Fluorite-structure solid solutions with ultrahigh fluoride ion mobility are widely recognized as promising solid electrolytes for applications in solid-state electrochemical devices like fluoride ion batteries (FIBs). Herein, solid solutions in the PbF₂-CaF₂-KF system were prepared by mechanochemical synthesis. The structure and morphology of the synthesized solid solutions are studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). The fluoride ion conductivity of the samples is investigated by the electrochemical impedance spectroscopy (EIS). The results show that the fluorite-structure solid electrolyte β-Pb_0.75Ca_0.2K_0.05F_1.95 with high ionic conductivity (1.46 × 10⁻³ S/cm at 20 °C) can be obtained combined with brief low-temperature heat treatment.

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来源期刊

Solid State Ionics 物理-物理：凝聚态物理

CiteScore

6.10

自引率

3.10%

发文量

152

审稿时长

58 days

期刊介绍： This interdisciplinary journal is devoted to the physics, chemistry and materials science of diffusion, mass transport, and reactivity of solids. The major part of each issue is devoted to articles on: (i) physics and chemistry of defects in solids; (ii) reactions in and on solids, e.g. intercalation, corrosion, oxidation, sintering; (iii) ion transport measurements, mechanisms and theory; (iv) solid state electrochemistry; (v) ionically-electronically mixed conducting solids. Related technological applications are also included, provided their characteristics are interpreted in terms of the basic solid state properties. Review papers and relevant symposium proceedings are welcome.