Synthesis of pyrochlore tungsten trioxide thin film and electrochemical lithium intercalation |
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Authors: | Aishui Yu Naoaki Kumagai Hitoshi Yashiro |
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Affiliation: | Department of Applied Chemistry and Molecular Science, Faculty of Engineering, Iwate University, Morioka 020, Japan |
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Abstract: | The pyrochlore tungstate thin film has been prepared by an autoclave hydrothermal method at a temperature of 200 °C. The film was characterized by X-ray diffractometry, X-ray photoelectron spectroscopy and scanning electron micrograph measurements, showing that pure pyrochlore phase of sodium tungstate containing a small amount of water was formed by heating the film at a temperature of 350 °C. The cyclic voltammetric and galvanostic measurements revealed that a reversible electrochemical lithium intercalation into the crystal lattice of pyrochlore tungstate film takes place with charge-discharge cycling. Furthermore, the thermodynamics and kinetics of electrochemical lithium intercalation into the pyrochlore sodium tungstate film were also studied. |
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Keywords: | Electrochemical lithium intercalation Pyrochlore sodium tungstate thin film Hydrothermal method |
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