Phase Transitions and High-Voltage Electrochemical Behavior of LiCoO[sub 2] Thin Films Grown by Pulsed Laser Deposition
- 1 January 2007
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 154 (4), A337-A342
- https://doi.org/10.1149/1.2509021
Abstract
The phase transitions and electrochemical behavior of LiCoO2LiCoO2 thin-film cathodes prepared by pulsed laser deposition are studied for charging voltages ranging from 4.2to4.9V4.2to4.9V . Two voltage plateaus at about 4.55 and 4.62V4.62V are observed in the charge-discharge curves. Ex situ X-ray diffraction measurements confirm structural changes and a phase transition from the O3 to the H1-3 phase when LiCoO2LiCoO2 is charged above 4.5V4.5V . Thin-film LiCoO2LiCoO2 electrodes show stable capacity retention up to 4.5V4.5V but significant capacity fade above 4.5V4.5V , which we attribute to damage from strain due to phase transitions and Li gradients. Li diffusion in the LixCoO2LixCoO2 thin film up to 4.5V4.5V is investigated by the potentiostatic intermittent titration technique. The chemical diffusion coefficient of Li reaches the maximum near x=0.4x=0.4 and starts to decrease when the Li content is further decreased.Keywords
This publication has 34 references indexed in Scilit:
- Li diffusion in LiCoO2 thin films prepared by pulsed laser depositionJournal of Power Sources, 2006
- Improving the Capacity Retention of LiCoO[sub 2] Cycled to 4.5 V by Heat-TreatmentElectrochemical and Solid-State Letters, 2004
- Studies of LiCoO[sub 2] Coated with Metal OxidesElectrochemical and Solid-State Letters, 2003
- Structural and electrochemical characterizations of surface-modified LiCoO2 cathode materials for Li-ion batteriesSolid State Ionics, 2002
- Electrochemical Evaluation and Structural Characterization of Commercial LiCoO[sub 2] Surfaces Modified with MgO for Lithium-Ion BatteriesJournal of the Electrochemical Society, 2002
- Staging Phase Transitions in Li[sub x]CoO[sub 2]Journal of the Electrochemical Society, 2002
- Preparation of c-axis oriented thin films of LiCoO2 by pulsed laser deposition and their electrochemical propertiesJournal of Power Sources, 2001
- Novel LiCoO2 Cathode Material with Al2O3 Coating for a Li Ion CellChemistry of Materials, 2000
- Comparative study of LiCoO2, LiNi Co O2 and LiNiO2 for 4 volt secondary lithium cellsElectrochimica Acta, 1993
- Determination of the Kinetic Parameters of Mixed‐Conducting Electrodes and Application to the System Li3SbJournal of the Electrochemical Society, 1977