Electrochimica Acta, volume 294, pages 217-225

Electrochemical properties and structural stability of Ga- and Y- co-doping in Li7La3Zr2O12 ceramic electrolytes for lithium-ion batteries

Yali Luo 1, 2, 3
Xueyan Li 4
Yanli Zhang 1, 2, 3
Lin Ge 1, 2, 3
Han Chen 1, 2, 3
Lucun Guo 1, 2, 3
1
 
College of Materials Science and Engineering
3
 
No. 5 Xinmofan Road Nanjing Jiangsu 210009 PR China
4
 
Lejin Chemical (Nanjing) Information Material Co., Ltd, No. 17 Hengyi Road, Nanjing, Jiangsu 210038, PR China
Publication typeJournal Article
Publication date2019-01-01
Quartile SCImago
Q1
Quartile WOS
Q2
Impact factor6.6
ISSN00134686
General Chemical Engineering
Electrochemistry
Abstract
Ga-, Y- co-doped Li7La3Zr2O12 ceramic electrolytes with composition of Li7-3xGaxLa3-yYyZr2O12 (x = 0.2 and y = 0, 0.125, 0.25, 0.5) were prepared via conventional solid-state reaction in air and characterized using X-ray diffraction (XRD), Raman spectra, scanning electron microscopy (SEM) and AC impedance spectroscopy. XRD analysis and Raman spectra showed that all samples formed a single cubic phase with garnet-type structure. Among the materials investigated, Li6.4Ga0.2La2.75Y0.25Zr2O12 sample presented the highest lithium-ion conductivity of 1.61 mS cm−1 at room temperature, a minimum activation energy of 0.281 eV along with the maximum relative density of 96.6%. The stability of Li6.4Ga0.2La2.75Y0.25Zr2O12 material was also investigated in liquid electrolyte, air, LiCl solution, deionized water and LiOH solution. Although the Li+/H+ exchange was confirmed by XRD, Raman spectra, Fourier Transform infrared spectroscopy (FTIR) and thermo-gravimetric analysis (TGA), the garnet-type cubic structure was found to be stable for the sample after immersion in organic liquid electrolyte, in LiCl solution, deionized water, at room temperature for two weeks. The lithium-ion conductivity was more or less decreased in the sample treated in air, LiCl solution, deionized water and LiOH solution. However, no decrease in conductivity was observed in the sample upon organic liquid electrolyte treatment for a long time, making it a suitable alternative in fabricating hybrid lithium-ion batteries. Therefore, through construction of the symmetric Li/Garnet/Li cells, the interfacial resistance decreases from 970 to 205 Ω cm2 by adding liquid electrolyte as a buffer layer. Meanwhile, the full cells consisting of hybrid electrolyte, lithium-metal anode, and LiCoO2 cathode demonstrate a high initial discharge capacity of 140 mAh g−1 and excellent cycling stability with 130 mAh g−1 retained after 100 cycles at a charge/discharge rate of 15 mA g−1 at room temperature.

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Luo Y. et al. Electrochemical properties and structural stability of Ga- and Y- co-doping in Li7La3Zr2O12 ceramic electrolytes for lithium-ion batteries // Electrochimica Acta. 2019. Vol. 294. pp. 217-225.
GOST all authors (up to 50) Copy
Luo Y., Li X., Zhang Y., Ge L., Chen H., Guo L. Electrochemical properties and structural stability of Ga- and Y- co-doping in Li7La3Zr2O12 ceramic electrolytes for lithium-ion batteries // Electrochimica Acta. 2019. Vol. 294. pp. 217-225.
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RIS Copy
TY - JOUR
DO - 10.1016/j.electacta.2018.10.078
UR - https://doi.org/10.1016/j.electacta.2018.10.078
TI - Electrochemical properties and structural stability of Ga- and Y- co-doping in Li7La3Zr2O12 ceramic electrolytes for lithium-ion batteries
T2 - Electrochimica Acta
AU - Luo, Yali
AU - Li, Xueyan
AU - Zhang, Yanli
AU - Ge, Lin
AU - Chen, Han
AU - Guo, Lucun
PY - 2019
DA - 2019/01/01 00:00:00
PB - Elsevier
SP - 217-225
VL - 294
SN - 0013-4686
ER -
BibTex
Cite this
BibTex Copy
@article{2019_Luo,
author = {Yali Luo and Xueyan Li and Yanli Zhang and Lin Ge and Han Chen and Lucun Guo},
title = {Electrochemical properties and structural stability of Ga- and Y- co-doping in Li7La3Zr2O12 ceramic electrolytes for lithium-ion batteries},
journal = {Electrochimica Acta},
year = {2019},
volume = {294},
publisher = {Elsevier},
month = {jan},
url = {https://doi.org/10.1016/j.electacta.2018.10.078},
pages = {217--225},
doi = {10.1016/j.electacta.2018.10.078}
}
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