Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 9, Pages 8055-8064Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b12759
Keywords
lithium-ion batteries; titanium dioxide; vanadium pentoxide; atomic layer deposition; transmission electron microscopy; EDX-STEM tomography
Funding
- Flemish research foundation FWO-Vlaanderen
- European Research Council [239865, 335078]
- IWT-Flanders (SBO project) [IWT 18142]
- Special Research Fund BOF of Ghent University [GOA-01G01513]
- European Research Council (ERC) [335078] Funding Source: European Research Council (ERC)
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Vanadium pentoxide (V2O5) is proposed and investigated as a cathode material for lithium -ion (Li -ion) batteries. However, the dissolution of V2O5 during the charge/discharge remains as an issue at the V2O5 electrolyte interface. In this work, we present a heterogeneous nanostructure with carbon nanotubes supported V2O5/titanium dioxide (TiO2) multilayers as electrodes for thin-film Li -ion batteries. Atomic layer deposition of V2O5 on carbon nanotubes provides enhanced Li storage capacity and high rate performance. An additional TiO2 layer leads to increased morphological stability and in return higher electrochemical cycling performance of V2O5/carbon nanotubes. The physical and chemical properties of TiO2/V2O5/carbon nanotubes are characterized by cyclic voltammetry and charge/discharge measurements as well as electron microscopy. The detailed mechanism of the protective TiO2 layer to improve the electrochemical cycling stability of the V2O5 is unveiled.
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