Li ion transport properties of amorphous/crystalline Li-La-Zr-Nb-O solid electrolyte thick films prepared by suspension plasma spraying

被引:5
|
作者
Koresh, Ido [1 ]
Klein, Brittney A. [2 ]
Tang, Zhaolin [1 ,3 ]
Michaelis, Vladimir K. [2 ]
Troczynski, Tom [1 ]
机构
[1] Univ British Columbia, Dept Mat Engn, Vancouver, BC V6T1Z4, Canada
[2] Univ Alberta, Dept Chem, Edmonton, AB T6G2G2, Canada
[3] Northwest Mettech Corp, Surrey, BC V4N4C4, Canada
基金
加拿大创新基金会;
关键词
Solid electrolyte; Suspension plasma spray; Garnet-type oxide; Amorphous Li-La-Zr-O; Superlinear power law behavior; Jonscher power law; AMORPHOUS PHASE-FORMATION; GARNET-TYPE LI7LA3ZR2O12; LITHIUM-ION; AC CONDUCTIVITY; FREQUENCY-DEPENDENCE; CHEMICAL-STABILITY; BATTERY; CONDUCTORS; ALUMINA; AL;
D O I
10.1016/j.ssi.2022.115938
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Amorphous Li-La-Zr-O films are considered very attractive as a solid-state electrolyte in future batteries due to their low processing temperatures and resistance to Li-dendrite formation. The knowledge of amorphous Li-La-Zr-O phases is limited and thick films and bulk samples of amorphous Li-La-Zr-O have yet to be explored. Only thin film forms (-0.5 mu m) of these amorphous Li-La-Zr-O phases have been prepared. In this work, we investigated the Li-ion transport properties of amorphous/crystalline mixtures of Li-La-Zr-Nb-O thick films (30 to 55 mu m) prepared by the suspension plasma spray process. The process was manipulated to alter the amorphous Li-La-Zr-Nb-O content in the as-deposited films. Properties of the films that contained mostly amorphous Li-La-Zr-Nb-O (-76 wt%) were compared vs. mostly cubic Li garnet-type oxide (-55 wt%). The latter showed Li-ion transport properties that were similar to previously reported properties of cubic Li-garnet type oxides whereas the amorphous Li-La-Zr-Nb-O films exhibited significantly different properties. Their AC conductivity spectra show a Jonscher power law (JPL) behavior with the dimensionless exponent of-0.92 that is followed by superlinear power law (SLPL) behavior with the dimensionless exponent of -1.65 in the high frequency regime. These behaviors have not been reported earlier for the amorphous Li-La-Zr-Nb-O phases. Both of the JPL and SLPL behaviors have thermally activated characteristic with the activation energies of 0.76 eV and 0.64 eV, respectively. A lower value of -0.45 eV was evaluated for the activation energy by solid-state Li-7 NMR spectroscopy. The effect of temperature on the Li-ion dynamic process was studied by scaling the conductivity spectra and it was found to be temperature independent.
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页数:10
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