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首页> 外文学位 >Optimization of Li-ion Conductivity of Garnet-type Li 5La3Nb2O12 by Nb-site Substitution Approach.
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Optimization of Li-ion Conductivity of Garnet-type Li 5La3Nb2O12 by Nb-site Substitution Approach.

机译：Nb-位取代法优化石榴石型Li 5La3Nb2O12锂离子电导率

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摘要

Solid state Li ion electrolytes based on the garnet type crystal structure have been successfully synthesized using the ceramic method. The approach employed in this thesis was doping of the Nb-site in Li 5La3Nb2O12 with Sm and Gd and Li stuffing into the garnet-like oxides for charge balance. The resulting family of compounds have a nominal formula Li5+2xLa3Nb2-xSm xO12 (0 ≤ x ≤ 0.7) and Li5+2xLa3Nb 2-xGdxO12 (0 ≤ x ≤ 0.45).;Experimental techniques used for the characterization of the solid state materials include powder X-ray diffraction (PXRD) to determine the crystal structure, scanning electron microscopy (SEM) to analyze the microstructure, energy dispersive spectroscopy (EDS) to confirm the elemental composition, AC impedance spectroscopy to determine the lithium ion conductivity Fourier transform infrared spectroscopy (FTIR) to confirm the presence of OH - and CO32- groups in the samples and thermogravimetric analysis (TGA) to test the thermal stability of the compound.;The most promising samples were the x = 0.3 member of the Sm-doped family and the x = 0.45 member of the Gd-doped family. Li5.6La3Nb 1.7Sm0.3O12 showed a conductivity of 5.84 x 10 -5 S cm-1 at room temperature, with an activation energy of 0.38 eV in the 25-225 &
机译：已经使用陶瓷方法成功地合成了基于石榴石型晶体结构的固态锂离子电解质。本文采用的方法是用Sm和Gd掺杂Li 5La3Nb2O12中的Nb位，并将Li填充到石榴石状氧化物中以达到电荷平衡。所得化合物族的标称公式为Li5 + 2xLa3Nb2-xSm xO12（0≤x≤0.7）和Li5 + 2xLa3Nb 2-xGdxO12（0≤x≤0.45）;用于表征固态材料的实验技术包括粉末X射线衍射（PXRD）确定晶体结构，扫描电子显微镜（SEM）分析微观结构，能量色散光谱（EDS）确认元素组成，交流阻抗谱确定锂离子电导率傅里叶变换红外光谱（FTIR）来确定样品中是否存在OH-和CO32-基团，并通过热重分析（TGA）来测试该化合物的热稳定性。最有希望的样品是x = 0.3的Sm掺杂族和x = 0.45的掺d族成员。 Li5.6La3Nb 1.7Sm0.3O12在室温下显示出5.84 x 10 -5 S cm-1的电导率，在25-225°C下的活化能为0.38 eV

著录项

  • 作者

    Pinzaru, Dana Irina.;

  • 作者单位

    University of Calgary (Canada).;

  • 授予单位 University of Calgary (Canada).;
  • 学科 Materials science.;Physical chemistry.
  • 学位 M.Sc.
  • 年度 2015
  • 页码 111 p.
  • 总页数 111
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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