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首页> 外文期刊>Journal of power sources >Correlation between micro-structural properties and ionic conductivity of Li_(1.5)Al_(0.5)Ge_(1.5)(P0_4)_3 ceramics
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Correlation between micro-structural properties and ionic conductivity of Li_(1.5)Al_(0.5)Ge_(1.5)(P0_4)_3 ceramics

机译：Li_（1.5）Al_（0.5）Ge_（1.5）（P0_4）_3陶瓷的微观结构性质与离子电导率的相关性

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摘要

We report on the structure and lithium ion transport properties of Li_(1.5)Al_(0.5)Ge_(1.5)(PO_4)3 (LAGP).This material is commercially available and is prepared as amorphous powders via a flame spray technique called Flash Creation Method (FCM). We crystallize and sinter the amorphous powders at different temperatures in order to alter grain size and grain boundary properties. The structure is then characterized by means of powder X-ray diffraction, atomic force microscopy, scanning electron microscopy and transmission electron microscopy with energy dispersive X-ray spectroscopy. AC impedance spectroscopy is used to study lithium ion transport. A maximum total conductivity of 2 × 10~(-4)Scm~(-1) at room temperature is found for a sample sintered at 750 ℃ for 2 h. In order to distinguish between grain and grain boundary contributions to the impedance spectra, equivalent circuit fits are carried out. The results are analysed in the framework of the classical brick layer model and of a finite-element approach taking into account non-ideal grain contacts. Our experimental results for the grain and grain boundary resistances are in good agreement with the predications of the finite-element approach.
机译：我们报告了Li_（1.5）Al_（0.5）Ge_（1.5）（PO_4）3（LAGP）的结构和锂离子传输性能。该材料可商购，通过称为Flash Creation的火焰喷涂技术制成无定形粉末方法（FCM）。我们在不同温度下结晶和烧结无定形粉末，以改变晶粒尺寸和晶界性能。然后通过粉末X射线衍射，原子力显微镜，扫描电子显微镜和具有能量色散X射线光谱的透射电子显微镜对结构进行表征。交流阻抗谱用于研究锂离子的传输。在750℃烧结2 h的样品在室温下的最大总电导率为2×10〜（-4）Scm〜（-1）。为了区分晶粒和晶界对阻抗谱的贡献，进行了等效电路拟合。在经典砖层模型和考虑非理想晶粒接触的有限元方法的框架下分析结果。我们对晶粒和晶界电阻的实验结果与有限元方法的预测结果非常吻合。

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