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Solution Processing of V2O5-WO3 Composite Films for Enhanced Li-Ion Intercalation Properties

Published online by Cambridge University Press:  17 April 2019

Chuan Cai ,
Dongsheng Guan  and
Ying Wang
Chuan Cai
Affiliation:
Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70803, U.S.A.
Dongsheng Guan
Affiliation:
Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70803, U.S.A.
Ying Wang
Affiliation:
Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70803, U.S.A.
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Abstract

We have employed a simple and novel solution processing method to prepare V2O5-WO3 composite films which demonstrate enhanced Li-ion intercalation properties for applications in lithium-ion batteries. It should be noted that this solution processing method employs precursors that only contain the elements of V, W, O and H, which avoids impurity elements such as Na that has been commonly used in other solution methods. The V2O5-WO3 composite films show enhanced Li-ion intercalation properties compared to pure V2O5 and WO3 films. For example, V2O5-WO3 film with a molar ratio V2O5/WO3 of 10/1 exhibits a discharge capacity of 254 mA•h/g, while the pure V2O5 film delivers a discharge capacity of 76 mA•h/g at a high current density of 1.33 A/g. Such enhanced Li-ion intercalation properties are attributed to the reduced crystallinity and increased porosity and surface area in the composite films. In addition, the chronopotentiometric curves of the V2O5-WO3 film with a mol ratio of 10:1 are distinctively different from those of pure oxide films and other composite films with different V2O5/WO3 mol ratios, suggesting a different Li-ion intercalation process in the V2O5-WO3 film with the mol ratio of 10/1.

Keywords

solution depositionenergy storagefilm

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