Mechanism Study of Lithium Ion Insertion into Titania Nanotubes

Lithium-ion batteries (LIBs) are widely used to power portable devices, microelectronics, and vehicles.  With many advantages such as high surface area and improved charge transport, self-supported 3-D nanostructured metal oxides are promising electrode materials for LIBs and their impact is particularly significant when considering the miniaturization of energy storage systems and the development of 3D microbatteries [1-3].

During this talk, it will be presented the utilization of self-organized titania nanotubes (TiO₂nts) as negative 3D self-supported electrode for Li-ion microbatteries [4–8]. This 3D nanostructured electrode is quite interesting owing to better electrochemical performance in terms of kinetics and stability.

Then, the fabrication of a all-solid-state battery composed of vertical arrays of TiO₂nts as anode, a polymer thin film as electrolyte, and a high potential cathode material like LiNi_0.5Mn_1.5O₄ (LNMO) layer will be shown [9] and  the current approaches developed to achieve the fabrication of a full 3D microcell will be highlighted. Particularly, the conformal electrodeposition of polymer electrolyte into titania nanotubes [10] will be discussed as well as the improvement of the electrochemical performance.

Finally, the Li⁺ insertion into anatase titania nanotubes employing PEO-based polymer electrolyte studied by cyclic voltammetry and chronoamperometry will be presented. The study shows that the Li⁺ storage in the anatase is dominated by the bulk diffusion (into the lattice) and the increasing contribution of the pseudo-capacitive effect with faster kinetics We also report that the chemical diffusion of Li⁺ in self-organized titania nanotubes  is around 2 × 10^-16 cm² s^-1 suggesting that the use of a solid electrolyte does not alter the charge transport in the nanostructured electrode.

References

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[3]           M. Nathan, D. Golodnitsky, V. Yufit, E. Strauss, T. Ripenbein, I. Shechtman, S. Menkin, E. Peled,                   Microelectromechanical Syst. J. 14 (2005) 879.

[4]           G. Ortiz, I. Hanzu, T. Djenizian, P. Lavela, J.L. Tirado, and P. Knauth, Chem. Mater. 21 (2009) 63.

[5]           N.A. Kyeremateng, C. Lebouin, P. Knauth, T. Djenizian, Electrochim. Acta 88 (2012) 814.

[6]           N.A. Kyeremateng, V. Hornebecq, P. Knauth, T. Djenizian, Electrochim. Acta 62 (2012) 192.

[7]           T. Djenizian, I. Hanzu, P. Knauth, J. Mater. Chem. 21 (2011) 9925.

[8]           N.A. Kyeremateng, N. Plylahan, A.C.S. dos Santos, L. V Taveira, L.F.P. Dick, T. Djenizian, Chem. Commun. 49 (2013) 4205.

[9]           N. Plylahan, M. Letiche, M. Barr, and T. Djenizian, Electrochem. Commun., 43, 121 (2014).

[10]        N. Plylahan, N.A. Kyeremateng, M. Eyraud, F. Dumur, H. Martinez, L. Santinacci, P. Knauth, T.   Djenizian, Nanoscale Res. Lett. 7 (2012) 349.