期刊
JOURNAL OF POWER SOURCES
卷 365, 期 -, 页码 43-52出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2017.08.020
关键词
Ta-doped LLZO; Thin film battery; Solid electrolyte; PLD thin film; Ionic conductivity; Lithium ion battery
资金
- Hong Kong Innovation Technology Fund [ITS/371/15]
- Hong Kong PhD Fellowship
With its stability against Li and good ionic conductivity, Li7La3Zr2O12 (LLZO) has emerged as a promising electrolyte material for lithium-based solid-state batteries (SSBs). Thin layers of solid electrolyte are needed to enable the practical use of SSBs. We report the first deposition of Li-conductive crystalline Ta-doped LLZO thin films on MgO (100) substrates via pulsed laser deposition. Further, we investigate the impact of laser fluence, deposition temperature (in the 50 degrees C-700 degrees C range), and post-deposition annealing on the structural, compositional, and transport properties of the film. We analyze the structure of the deposited films via grazing incident X-ray diffraction, their morphology via scanning electron microscopy, and the composition via depth profiling X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectrometry. The Li ionic conductivity is investigated via electrochemical impedance spectroscopy. Contrary to previous reports for LLZO films, the crystalline Ta-doped films presents a pure cubic LLZO structure for deposition temperatures as low as 50 degrees C, with resulting conductivities not significantly influenced by the temperature deposition. Instead, the laser fluence has a major effect on the growth rate of the thin films. (C) 2017 Elsevier B.V. All rights reserved.
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