Three-dimensionally ordered macroporous amorphous C/TiO2 composite electrodes for lithium-ion batteries

Carroll, Aoife; Grant, Alex; Zhang, Yan; Gulzar, Umair; Ahad, Syed Abdul; Geaney, Hugh; O’Dwyer, Colm

Three-dimensionally ordered macroporous amorphous C/TiO2 composite electrodes for lithium-ion batteries

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Files

Carroll_2024_ECS_Adv._3_010502.pdf(2.42 MB)

Published Version

Date

2024-02-09

Authors

Carroll, Aoife

Grant, Alex

Zhang, Yan

Gulzar, Umair

Ahad, Syed Abdul

Geaney, Hugh

O’Dwyer, Colm

Publisher

IOP Publishing

Published Version

https://doi.org/10.1149/2754-2734/ad248e

Abstract

A facile method utilizing colloidal templating and sucrose as a carbon precursor is used to synthesize highly ordered, porous inverse opal structures as C/TiO2 nanocomposites. Material characterization shows amorphous TiO2 and a large pore size of ∼400 nm allowing for enhanced electrolyte penetration. C/TiO2 inverse opals materials as electrodes in Li-ion battery half cells demonstrate discharge and charge capacities of ∼870 mAh g−1 and 470 mAh g−1, respectively, at a current density of 150 mA g−1. The enhanced capacities, which surpass theoretical limits for TiO2 and carbon based on intercalation reactions, are analyzed under voltammetric conditions to assess relative contributions to capacity from diffusion-limited intercalation and capacitive charge compensation reactions. The porous structure contributes to excellent capacity retention, rate performance and improved Coulombic efficiency (99.6% after 250 cycles), compared to individual carbon and TiO2 inverse opals.

Keywords

Three-dimensionally ordered macroporous amorphous C/TiO2 composite electrodes , Lithium-ion batteries

Citation

Carroll, A., Grant, A., Zhang, Y., Gulzar, U., Ahad, S. A., Geaney, H. and O’Dwyer, C. (2024) 'Three-dimensionally ordered macroporous amorphous C/TiO2 composite electrodes for lithium-ion batteries', ECS Advances, 3(1), 010502 (10pp). https://doi.org/10.1149/2754-2734/ad248e