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Electrostatic spray deposition of thin layers of cathode materials for lithium battery

A novel fabrication technique, namely electrostatic spray deposition (ESD), has been developed in order to prepare thin layers of solid electrolytes and cathode materials for lithium batteries. In this study, the 4-volt cathode material LiCoO 2 was chosen, and prepared by spraying alcohol solutions...

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Bibliographic Details
Published in:Solid state ionics 1996-07, Vol.86, p.1301-1306
Main Authors: Chen, C.H., Kelder, E.M., Jak, M.J.G., Schoonman, J.
Format: Article
Language:English
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Summary:A novel fabrication technique, namely electrostatic spray deposition (ESD), has been developed in order to prepare thin layers of solid electrolytes and cathode materials for lithium batteries. In this study, the 4-volt cathode material LiCoO 2 was chosen, and prepared by spraying alcohol solutions of nitrates and acetates of cobalt. ESD set-ups, with either horizontal or vertical configurations, were used. Depending on the precursor and process deposition conditions, the morphology of the layers can be relatively dense, fractal-like porous, or unique 3-D cross-linked porous structures with a high porosity and a narrow pore size distribution. For low deposition temperatures, LiCoO 2 layers are XRD amorphous. Upon annealing, crystallized layers are obtained. The lithium chemical diffusion coefficient of the LiCoO 2 layers has been measured with Galvanostatic Intermittent Titration Technique (GITT), values range from 10 −14 to 10 −12 cm 2/s, depending on the lithium content and the annealing temperatures. Cyclic voltammograms of a test cell reveal that both lithium insertion and extraction are one-step processes.
ISSN:0167-2738
1872-7689
DOI:10.1016/0167-2738(96)00305-0