Journal
APPLIED SURFACE SCIENCE
Volume 575, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2021.151762
Keywords
Garnet electrolytes; Sintering temperature; Microstructure; Electrolyte/Li interface; Electrical performance
Categories
Funding
- National Natural Science Foundation of China (NSFC) [51805112, 51974101, 51975150]
- Natural Science Foundation of Heilongjiang Province, China [LH2020E037]
- China Postdoctoral Science Foundation [2019T120261, 2018M630349]
Ask authors/readers for more resources
By using a liquid sintering method with a specific additive, stable LLZTO ceramics with excellent conductivity and mechanical properties can be successfully prepared, suitable for electrolyte/Li interface design to enhance the performance of solid-state lithium batteries.
Garnet electrolytes have been approved widespread as one of the most competitive candidates in all solid state lithium batteries (ASSLBs). Herein, dense Li6.4La3Zr1.4Ta0.6O12 (LLZTO) ceramics were successfully produced via liquid sintering method by introducing 1 wt% 3Li(2)O-2GeO(2) additive at reduced sintering temperatures for a shortened process period compared to solid method in air atmosphere. Relationships among sintering temperature, microstructure, densities, mechanical properties and electrical performance of the ceramics were explored concretely. The ceramics can be well densified and modified microstructurally at the appropriate sintering temperature, making the ionic conductivity significantly promoted. Mechanical properties would be enhanced as well, resulted to a compact and tough ceramic surface. Hence, a good-contacted, homogeneous and electrochemically stable electrolyte/Li interface can be fabricated. The LLZTO-1 wt% (3Li(2)O-2GeO(2)) composite electrolyte sintered at 1160 degrees C for 3 h exhibits the best comprehensive properties, the ionic conductivity and critical current density (CCD) of which reach 6.27 x 10(-4) S.cm(-1) and 0.5 mA.cm(-2) at 25 degrees C. The improved interfacial performance enables the Li|LLZTO-1 wt% (3Li(2)O-2GeO(2))|Li symmetrical cells and the LiFePO4|LLZTO-1 wt% (3Li(2)O-2GeO(2))|Li cells a good cycling performance at different current densities.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available