Effect of Sintering Process on Ionic Conductivity of Li<sub>7-x</sub>La<sub>3</sub>Zr<sub>2-x</sub>Nb<sub>x</sub>O<sub>12</sub> (x = 0, 0.2, 0.4, 0.6) Solid Electrolytes
Garnet-type Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> (LLZO) is considered as a promising solid electrolyte. Nb-doped LLZO ceramics exhibit significantly improved ion conductivity. However, how to prepare the Nb-doped LLZO ceramics in a...
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doaj-d4debc586943452cbc2c19652e2a01eb2021-03-29T23:01:28ZengMDPI AGMaterials1996-19442021-03-01141671167110.3390/ma14071671Effect of Sintering Process on Ionic Conductivity of Li<sub>7-x</sub>La<sub>3</sub>Zr<sub>2-x</sub>Nb<sub>x</sub>O<sub>12</sub> (x = 0, 0.2, 0.4, 0.6) Solid ElectrolytesLei Ni0Zhigang Wu1Chuyi Zhang2School of Materials Science and Engineering, Chang’an University, Xi’an 710064, ChinaSchool of Materials Science and Engineering, Chang’an University, Xi’an 710064, ChinaSchool of Materials Science and Engineering, Chang’an University, Xi’an 710064, ChinaGarnet-type Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> (LLZO) is considered as a promising solid electrolyte. Nb-doped LLZO ceramics exhibit significantly improved ion conductivity. However, how to prepare the Nb-doped LLZO ceramics in a simple and economical way, meanwhile to investigate the relationship between process conditions and properties in Li<sub>7-x</sub>La<sub>3</sub>Zr<sub>2-x</sub>Nb<sub>x</sub>O<sub>12</sub> ceramics, is particularly important. In this study, Li<sub>7-x</sub>La<sub>3</sub>Zr<sub>2-x</sub>Nb<sub>x</sub>O<sub>12</sub> (LLZN<sub>x</sub>O, x = 0, 0.2, 0.4, 0.6) ceramics were prepared by conventional solid-state reaction. The effect of sintering process on the structure, microstructure, and ionic conductivity of LLZN<sub>x</sub>O (x = 0, 0.2, 0.4, 0.6) ceramics was investigated. Due to the more contractive Nb-O bonds in LLZN<sub>x</sub>O ceramics, the cubic structures are much easier to form and stabilize, which could induce the decreased preparation time. High-performance garnet LLZN<sub>x</sub>O ceramics can be obtained by optimizing the sintering process with lower calcining temperature and shorter holding time. The garnet samples with x = 0.4 calcined at 850 °C for 10 h and sintered at 1250 °C for 4 h exhibit the highest ionic conductivity of 3.86 × 10<sup>−4</sup> S·cm<sup>−1</sup> at room temperature and an activation energy of 0.32 eV, which can be correlated to the highest relative density of 96.1%, and good crystallinity of the grains.https://www.mdpi.com/1996-1944/14/7/1671Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub>solid electrolytesNb dopingsintering processionic conductivity |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Lei Ni Zhigang Wu Chuyi Zhang |
spellingShingle |
Lei Ni Zhigang Wu Chuyi Zhang Effect of Sintering Process on Ionic Conductivity of Li<sub>7-x</sub>La<sub>3</sub>Zr<sub>2-x</sub>Nb<sub>x</sub>O<sub>12</sub> (x = 0, 0.2, 0.4, 0.6) Solid Electrolytes Materials Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> solid electrolytes Nb doping sintering process ionic conductivity |
author_facet |
Lei Ni Zhigang Wu Chuyi Zhang |
author_sort |
Lei Ni |
title |
Effect of Sintering Process on Ionic Conductivity of Li<sub>7-x</sub>La<sub>3</sub>Zr<sub>2-x</sub>Nb<sub>x</sub>O<sub>12</sub> (x = 0, 0.2, 0.4, 0.6) Solid Electrolytes |
title_short |
Effect of Sintering Process on Ionic Conductivity of Li<sub>7-x</sub>La<sub>3</sub>Zr<sub>2-x</sub>Nb<sub>x</sub>O<sub>12</sub> (x = 0, 0.2, 0.4, 0.6) Solid Electrolytes |
title_full |
Effect of Sintering Process on Ionic Conductivity of Li<sub>7-x</sub>La<sub>3</sub>Zr<sub>2-x</sub>Nb<sub>x</sub>O<sub>12</sub> (x = 0, 0.2, 0.4, 0.6) Solid Electrolytes |
title_fullStr |
Effect of Sintering Process on Ionic Conductivity of Li<sub>7-x</sub>La<sub>3</sub>Zr<sub>2-x</sub>Nb<sub>x</sub>O<sub>12</sub> (x = 0, 0.2, 0.4, 0.6) Solid Electrolytes |
title_full_unstemmed |
Effect of Sintering Process on Ionic Conductivity of Li<sub>7-x</sub>La<sub>3</sub>Zr<sub>2-x</sub>Nb<sub>x</sub>O<sub>12</sub> (x = 0, 0.2, 0.4, 0.6) Solid Electrolytes |
title_sort |
effect of sintering process on ionic conductivity of li<sub>7-x</sub>la<sub>3</sub>zr<sub>2-x</sub>nb<sub>x</sub>o<sub>12</sub> (x = 0, 0.2, 0.4, 0.6) solid electrolytes |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2021-03-01 |
description |
Garnet-type Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> (LLZO) is considered as a promising solid electrolyte. Nb-doped LLZO ceramics exhibit significantly improved ion conductivity. However, how to prepare the Nb-doped LLZO ceramics in a simple and economical way, meanwhile to investigate the relationship between process conditions and properties in Li<sub>7-x</sub>La<sub>3</sub>Zr<sub>2-x</sub>Nb<sub>x</sub>O<sub>12</sub> ceramics, is particularly important. In this study, Li<sub>7-x</sub>La<sub>3</sub>Zr<sub>2-x</sub>Nb<sub>x</sub>O<sub>12</sub> (LLZN<sub>x</sub>O, x = 0, 0.2, 0.4, 0.6) ceramics were prepared by conventional solid-state reaction. The effect of sintering process on the structure, microstructure, and ionic conductivity of LLZN<sub>x</sub>O (x = 0, 0.2, 0.4, 0.6) ceramics was investigated. Due to the more contractive Nb-O bonds in LLZN<sub>x</sub>O ceramics, the cubic structures are much easier to form and stabilize, which could induce the decreased preparation time. High-performance garnet LLZN<sub>x</sub>O ceramics can be obtained by optimizing the sintering process with lower calcining temperature and shorter holding time. The garnet samples with x = 0.4 calcined at 850 °C for 10 h and sintered at 1250 °C for 4 h exhibit the highest ionic conductivity of 3.86 × 10<sup>−4</sup> S·cm<sup>−1</sup> at room temperature and an activation energy of 0.32 eV, which can be correlated to the highest relative density of 96.1%, and good crystallinity of the grains. |
topic |
Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> solid electrolytes Nb doping sintering process ionic conductivity |
url |
https://www.mdpi.com/1996-1944/14/7/1671 |
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