From liquid to thin film: colloidal suspensions for tungsten oxide as an electrode material for Li-ion batteries

Using a colloidal suspension, tungsten oxide thin films (150 nm) have been prepared via ultrasonic spray deposition using two different current collectors, namely TiN and Pt. First, the precursor chemistry was studied, revealing that the tungsten present is reduced due to the formation of chlorine g...

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Bibliographic Details
Published in:RSC advances Vol. 6; no. 57; pp. 51747 - 51756
Main Authors: van den Ham, E. J, Elen, K, Kokal, I, Yaci, B, Peys, N, Bonneux, G, Ulu, F, Marchal, W, Van Bael, M. K, Hardy, A
Format: Journal Article
Language:English
Published: 01.01.2016
Subjects:
annealing
chlorides
chlorine
collectors
colloids
dehydrogenation
electrochemistry
electrodes
hydrochloric acid
liquids
lithium batteries
spray deposition
temperature
tungsten oxide
ultrasonics
ISSN:2046-2069, 2046-2069
Online Access:Get full text
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Summary:Using a colloidal suspension, tungsten oxide thin films (150 nm) have been prepared via ultrasonic spray deposition using two different current collectors, namely TiN and Pt. First, the precursor chemistry was studied, revealing that the tungsten present is reduced due to the formation of chlorine gas. Due to a dehydrogenation 1,1-diethoxyethane (DEE) and hydrogen chloride (HCl) evolve from the precursor, reducing the chloride content of the precursor. The thin films were annealed at 400 and 500 C, yielding tetragonal tungsten oxide without the presence of chlorides. Electrochemical analysis indicated that the TiN current collector has a pronounced positive effect on cycling behavior of the WO 3 thin film. A higher annealing temperature yields an improved performance, but annealing at temperatures as low as 400 C also yielded electrochemically active WO 3 . The current study presents a versatile method to produce electrochemically active tungsten oxide thin films with a high volumetric capacity (640 mA h cm 3 ) at relatively low temperature to be applied in all-solid-state Li-ion batteries. Using a colloidal suspension, electrochemically active tungsten oxide thin films (150 nm) have been prepared via ultrasonic spray deposition using two different current collectors, namely TiN and Pt.
Bibliography:10.1039/c6ra08769h
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ISSN:2046-2069
2046-2069
DOI:10.1039/c6ra08769h