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Innovative Design for the Enhancement of Lithium Lanthanum Titanate Electrolytes
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2019-07-30 00:00:00 , DOI: 10.1021/acs.cgd.9b00825 Rafael B. de Oliveira 1 , Marcello R. B. Andreeta 1 , Dulcina M. P. F de Souza 1 , João E. F. S. Rodrigues 2 , Paulo S. Pizani 2
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2019-07-30 00:00:00 , DOI: 10.1021/acs.cgd.9b00825 Rafael B. de Oliveira 1 , Marcello R. B. Andreeta 1 , Dulcina M. P. F de Souza 1 , João E. F. S. Rodrigues 2 , Paulo S. Pizani 2
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The high ionic conductivity in lithium lanthanum titanate perovskite ceramics, Li3xLa(2/3)-xTiO3 (LLTO), is well-known for the x ≈ 0.11 lithium concentration. The grain conductivity is approximately 10–3 S·cm–1 at room temperature, which makes this compound one of the best candidates for the development of solid-state electrolytes. However, lower grain boundary conductivity (10–6 to 10–4 S·cm–1) blocks lithium diffusion. In order to increase the total conductivity of LLTO ceramics, single crystal fibers of lanthanum aluminate (LAO) were inserted into its green ceramic matrix. Our hypothesis is that single crystal fibers are capable of inducting LLTO abnormal grain growth, thus improving the overall electrical conductivity of the composite. The results show that LAO single crystals act like seeds, creating abnormal grain growth at the LaAlO3 fiber surface. The impedance spectroscopy shows that the new composites have a substantial relative enhancement of total ionic conductivity (more than 200%) in comparison with the monolithic ceramic samples. This result shows the possibility of developing a novel composite design as a candidate for solid electrolyte applications.
中文翻译：
增强钛酸锂镧电解质的创新设计
高离子电导率的锂镧钙钛矿钛酸陶瓷，黎3 X的La （2/3） - X的TiO 3（LLTO），是公知的X ≈0.11锂浓度。在室温下，颗粒的电导率约为10 –3 S·cm –1，这使该化合物成为开发固态电解质的最佳候选者之一。但是，较低的晶界电导率（10 –6至10 –4 S·cm –1）阻止锂扩散。为了增加LLTO陶瓷的总电导率，将铝酸镧（LAO）的单晶纤维插入其生坯陶瓷基体中。我们的假设是单晶纤维能够诱导LLTO异常晶粒长大，从而提高了复合材料的整体电导率。结果表明，LAO单晶的行为类似于种子，在LaAlO 3纤维表面产生异常的晶粒生长。阻抗谱表明，与整体陶瓷样品相比，新型复合材料的总离子电导率有相当大的相对提高（超过200％）。该结果表明开发出新颖的复合设计作为固体电解质应用的候选方案的可能性。
更新日期：2019-07-30
中文翻译：
增强钛酸锂镧电解质的创新设计
高离子电导率的锂镧钙钛矿钛酸陶瓷，黎3 X的La （2/3） - X的TiO 3（LLTO），是公知的X ≈0.11锂浓度。在室温下，颗粒的电导率约为10 –3 S·cm –1，这使该化合物成为开发固态电解质的最佳候选者之一。但是，较低的晶界电导率（10 –6至10 –4 S·cm –1）阻止锂扩散。为了增加LLTO陶瓷的总电导率，将铝酸镧（LAO）的单晶纤维插入其生坯陶瓷基体中。我们的假设是单晶纤维能够诱导LLTO异常晶粒长大，从而提高了复合材料的整体电导率。结果表明，LAO单晶的行为类似于种子，在LaAlO 3纤维表面产生异常的晶粒生长。阻抗谱表明，与整体陶瓷样品相比，新型复合材料的总离子电导率有相当大的相对提高（超过200％）。该结果表明开发出新颖的复合设计作为固体电解质应用的候选方案的可能性。
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