掺杂(Al3+,Ga3+)对石榴石型电解质Li7-xLa3Zr2-xTaxO12锂离子电导率的影响
Influence of Aland Ga on Lithium Ion Conductivities of Cubic Garnet-Type Li7-xLa3Zr2-xTaxO12 Electrolytes
DOI: 10.12677/MS.2017.73034, PDF, HTML, XML, 下载: 2,348  浏览: 5,456 
作者: 马丹祥：华中科技大学材料与工程学院，固态离子学实验室，湖北 武汉
关键词: 固态电解质；石榴石型电解质LLZTO；离子电导率；Al和Ga掺杂；Solid State Electrolyte； Garnet-Type LLZTO； Ionic Conductivity； Al and Ga Doping
摘要: 为了提高Li7−xLa3Zr2−xTaxO12(LLZTO)固体电解质电导率，本文研究了Al3+和Ga3+掺杂对材料性能的影响。结果表明，掺杂Al3+和Ga3+，显著提高了材料的致密度和电导率。Al-Li7−xLa3Zr2−xTaxO12(Al-LLZTO)中的铝离子同时存在于晶粒和晶界中，晶界中的铝含量是晶粒中的两倍，Al-Li6.4La3Zr1.4Ta0.6O12拥有最高的总电导率0.54 mS/cm，其激活能为0.42 eV。Li7−x−3yGayLa3Zr2−xTaxO12(Ga-LLZTO)中，铝的含量较低，镓离子同时存在于电解质的晶粒与晶界中。在锂含量相同的样品中，Ga-LLZTO的总电导率要高于Al-LLZTO，表明Ga的掺杂比Al的掺杂对LLZTO电解质的电导率提升更大。最终，我们得到总电导率最高的样品Li6.4Ga0.1La3Zr1.7Ta0.3O12，其总电导率和激活能分别为0.87 mS/cm和0.33 eV。
Abstract: To obtain highly conductive Li7−xLa3Zr2−xTaxO12 (LLZTO) electrolytes, the influence of Al and Ga on them were investigated. The Al and Ga have been demonstrated to be supervalent dopants that stabilize cubic garnetof Li7La3Zr2O12 (LLZO) electrolytes. They are also sintering-aided compositions, increasing the overall conductivity of LLZO electrolytes. The results show that all the obtained electrolytes are cubic. The densification and conductivity of the LLZTO electrolyte were improved by Al or Ga inclusion. In the Al-Li7−xLa3Zr2−xTaxO12 (Al-LLZTO) electrolytes, Al was found in the grains and grain boundaries, but the Al content in the grain boundaries is about twice of that in the grains. The overall conductivity was optimized to 0.54 mS/cm with an activation energy of 0.42 eV for the Al-Li6.4La3Zr1.4Ta0.6O12 sample. In theLi7−x−3yGayLa3Zr2−xTaxO12 (Ga-LLZTO) electrolytes, the Al in a low conent and Ga were found in grains and grain boundaries. The overall conductivities of Ga-LLZTO electrolytes were higher than that of the Al-LLZTO electrolytes with almost the same nominal Li-content. Finally, the highest overall conductivity of 0.87 mS/cm with a low activation energy of 0.33 eV was achieved for the Li6.4Ga0.1La3Zr1.7Ta0.3O12 sample.
文章引用：马丹祥. 掺杂(Al3+,Ga3+)对石榴石型电解质Li7-xLa3Zr2-xTaxO12锂离子电导率的影响[J]. 材料科学, 2017, 7(3): 243-253. https://doi.org/10.12677/MS.2017.73034

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