Transformation of diffusive to capacitive kinetics in nanoscale modified Co-TiO2@CNTs composites safeguarding steady reversible capacity as sodium-ion battery anode
Document Type
Article
Publication Date
5-5-2022
Abstract
The effective diffusion-controlled performance of the SIB anode, CoxTi1-xO2/CNTs, presented here offers high reversible sodium uptake. Kinetic studies of the samples conducted through cyclic voltammetry at various scan rates suggest that by increasing the mass ratio of Co atoms in TiO2 lattice the mechanism is shifted from a slow diffusive charge contribution to a fast capacitive charge contribution. Partial amorphization of the crystalline TiO2 diffraction planes revealed by ex-situ XRD along with the attenuation of the crystal lattice reflects the ability of the electrodes for high reversible sodium uptake. The synchronous effect of CNTs and Co loading enhance the porosity with multiple electronic/ionic conducting channels favouring high sodium storage and stability from 109.3 mAh g(-1) in TiO2 to 168.5 mAh g(-1) in Co0.03Ti0.97O2/CNT electrode after 80 cycles at a current rate of 0.05 C. (C) 2022 Published by Elsevier B.V.
Keywords
TiO2, Sodium-ion battery, Carbon nanotubes, Diffusion coefficient, Pseudocapacitive
Divisions
umpedac
Funders
King Khalid University, through Research Center for Advanced Materials Science (RCAMS) [RCAMS/KKU//010/21] [KKU/RCAMS/010/21]
Publication Title
Journal of Alloys and Compounds
Volume
902
Publisher
Elsevier
Publisher Location
PO BOX 564, 1001 LAUSANNE, SWITZERLAND