Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Vertically Aligned Binder-Free TiO2 Nanotube Arrays Doped with Fe, S and Fe-S for Li-ion Batteries

Version 1 : Received: 29 July 2021 / Approved: 30 July 2021 / Online: 30 July 2021 (09:06:37 CEST)

How to cite: Dasarathan, S.; Ali, M.; Jung, T.; Sung, J.; Ha, Y.; Park, J.W.; Kim, D. Vertically Aligned Binder-Free TiO2 Nanotube Arrays Doped with Fe, S and Fe-S for Li-ion Batteries. Preprints 2021, 2021070675 (doi: 10.20944/preprints202107.0675.v1). Dasarathan, S.; Ali, M.; Jung, T.; Sung, J.; Ha, Y.; Park, J.W.; Kim, D. Vertically Aligned Binder-Free TiO2 Nanotube Arrays Doped with Fe, S and Fe-S for Li-ion Batteries. Preprints 2021, 2021070675 (doi: 10.20944/preprints202107.0675.v1).

Abstract

Vertically aligned Fe, S, and Fe-S doped anatase TiO2 nanotube arrays are prepared by electrochemical anodization process using an organic electrolyte in which lactic acid is added as an additive. In the electrolyte, nanotube layers of greater length (12 μm) and high order with inner diameter of approx. 90 nm and outer diameter of approx. 170 nm are achieved. Doping of Fe, S, and Fe-S via simple wet impregnation method substituted Ti and O sites with Fe and S, which leads to enhance the rate performance at high discharge current densities. Discharge capacities of TiO2 tubes increased from 82 mAh g-1 (bare) to 165 mAh g-1 for Fe-S doped TiO2 at high current densities of 0.3 mAcm-2 after 100 cycles with exceptional capacity retention of 85% after 100 cycles. Owing to the enhancement of thermodynamic and kinetic properties by doping of Fe-S, Li-diffusion increas2ed resulting in remarkable discharge capacities of 143 mAh g-1 and 89 mAh g-1 at a current density of 7.4 mA cm-2 and 19 mA cm-2, respectively.

Keywords

Li-ion batteries; Binder-free electrodes; TiO2 nanotube arrays; Electrochemical anodization; Elemental doping

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