Electrochimica Acta, volume 296, pages 823-829

Synergistic regulation of garnet-type Ta-doped Li7La3Zr2O12 solid electrolyte by Li+ concentration and Li+ transport channel size

Publication typeJournal Article
Publication date2019-02-01
Quartile SCImago
Q1
Quartile WOS
Q2
Impact factor6.6
ISSN00134686
General Chemical Engineering
Electrochemistry
Abstract
The Li+ concentration and Li+ transport channel size of garnet-type solid electrolyte Li7La3Zr2O12 are the two key factors associated with the improvement of Li ionic conductivity. Through precise control of the Li+ concentration and the Li+ transport channel size by Ta-doping (Li7-XLa3Zr2-XTaXO12, X = 0.2–1.0), synergistic regulation of the two factors is achieved. Results show that the optimum Li+ concentration seems to be at about 6.31 where the Li+ occupancy in LiO6 is high and the Li+ arrangement in LiO4 is disordering. With the Li+ concentration higher than 6.31, the occupancy in LiO4 sites remains constant but the Li+ arrangement in LiO4 becomes more and more ordering. At higher Li+ concentration of 6.52, Li+ arrangement becomes certain of ordering which should have reduced the grain conductivity, however, the grain conductivity is still as high as 9.84 × 10−4 S cm−1. This indicates that LLZO with this Li+ concentration have favorable Li+ transport channel size. The optimum Li+ transport channel size is about 12.95 ± 0.01 A. At Li+ concentration of 6.31, the proper Li+ concentration is the main factor for the high grain ionic conductivity of 10.1 × 10−4 S cm−1. While at Li+ concentration of 6.52, the suitable Li+ transport channel size is the main factor for the high grain ionic conductivity. In conclusion, the high grain ionic conductivity at Li+ concentration of 6.31–6.52 is due to the synergistic regulation of Li+ concentration and Li+ transport channel size.

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Zhang Y. et al. Synergistic regulation of garnet-type Ta-doped Li7La3Zr2O12 solid electrolyte by Li+ concentration and Li+ transport channel size // Electrochimica Acta. 2019. Vol. 296. pp. 823-829.
GOST all authors (up to 50) Copy
Zhang Y., Deng J., Hu D., Chen F., Shen Q., Zhang J., Dong S. Synergistic regulation of garnet-type Ta-doped Li7La3Zr2O12 solid electrolyte by Li+ concentration and Li+ transport channel size // Electrochimica Acta. 2019. Vol. 296. pp. 823-829.
RIS |
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RIS Copy
TY - JOUR
DO - 10.1016/j.electacta.2018.11.136
UR - https://doi.org/10.1016/j.electacta.2018.11.136
TI - Synergistic regulation of garnet-type Ta-doped Li7La3Zr2O12 solid electrolyte by Li+ concentration and Li+ transport channel size
T2 - Electrochimica Acta
AU - Zhang, Yanhua
AU - Deng, Jiadong
AU - Hu, Dongwei
AU - Chen, Fei
AU - Shen, Qiang
AU - Zhang, Jian
AU - Dong, Shijie
PY - 2019
DA - 2019/02/01 00:00:00
PB - Elsevier
SP - 823-829
VL - 296
SN - 0013-4686
ER -
BibTex
Cite this
BibTex Copy
@article{2019_Zhang,
author = {Yanhua Zhang and Jiadong Deng and Dongwei Hu and Fei Chen and Qiang Shen and Jian Zhang and Shijie Dong},
title = {Synergistic regulation of garnet-type Ta-doped Li7La3Zr2O12 solid electrolyte by Li+ concentration and Li+ transport channel size},
journal = {Electrochimica Acta},
year = {2019},
volume = {296},
publisher = {Elsevier},
month = {feb},
url = {https://doi.org/10.1016/j.electacta.2018.11.136},
pages = {823--829},
doi = {10.1016/j.electacta.2018.11.136}
}
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