Journal
JOURNAL OF POWER SOURCES
Volume 189, Issue 1, Pages 365-370Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2008.08.015
Keywords
All-solid-state batteries; Solid electrolyte/LiCoO2 interface; Chemical diffusion coefficient; Potentiostatic intermittent titration technique; Electrochemical impedance spectroscopy
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LiCoO2 thin films were deposited on the NASICON-type glass ceramics, Li1+x+yAlxTi2-xSiyP3-yO12, by radio frequency (RF) magnetron sputtering and were annealed at different temperatures. The as-deposited and the annealed LiCoO2 thin films were characterized by X-ray diffraction (XRD), Raman spectroscopy and scanning electron microscopy (SEM). It was found that the films exhibited a (104) preferred orientation after annealing and Co3O4 was observed by annealing over 500 degrees C due to the reaction between the LiCoO2 and the glass ceramics. The effect of annealing temperature on the interfacial resistance of glass ceramics/LiCoO2 and Li-ion transport in the bulk LiCoO2 thin film was investigated by galvanostatic cycling, cyclic voltammetry (CV), potentiostatic intermittent titration technique (PITT) and electrochemical impedance spectroscopy (EIS) with the Li/PEO/glass ceramics/LiCoO2 cell. The cell performance was limited by the Li-ion diffusion resistance in Ohara/LiCoO2 interface as well as in bulk LiCoO2. (C) 2008 Elsevier B.V. All rights reserved.
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