Heterogeneous TiO2/V2O5/Carbon Nanotube Electrodes for Lithium-Ion Batteries

Mert Kurttepeli; Shaoren Deng; Felix Mattelaer; Daire J Cott; Philippe Vereecken; Jolien Dendooven; Christophe Detavernier; Sara Bals

doi:10.1021/acsami.6b12759

Heterogeneous TiO₂/V₂O₅/Carbon Nanotube Electrodes for Lithium-Ion Batteries

ACS Appl Mater Interfaces. 2017 Mar 8;9(9):8055-8064. doi: 10.1021/acsami.6b12759. Epub 2017 Feb 21.

Authors

Mert Kurttepeli¹, Shaoren Deng², Felix Mattelaer², Daire J Cott³, Philippe Vereecken³, Jolien Dendooven², Christophe Detavernier², Sara Bals¹

Affiliations

¹ Department of Physics, Electron Microscopy for Materials Science (EMAT), University of Antwerp , Groenenborgerlaan 171, B-2020 Antwerp, Belgium.
² Department of Solid State Sciences, Ghent University , Krijgslaan 281 S1, B-9000 Gent, Belgium.
³ IMEC, Kapeldreef 75, B-3001 Leuven, Belgium.

PMID: 28199079
DOI: 10.1021/acsami.6b12759

Abstract

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.

Keywords: EDX-STEM tomography; atomic layer deposition; lithium-ion batteries; titanium dioxide; transmission electron microscopy; vanadium pentoxide.