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UnThree – Dimensionally ordered macroporous amorphous C/TiO2 composite electrodes for lithium-ion batteries
Date
2024
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.
Supervisor
Description
Publisher
The Electrochemical Society
Citation
ECS Advances, 2024, 3, 010502
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Ahad_2024_Three.pdf
Adobe PDF, 2.42 MB
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Funding Information
We acknowledge support from the Irish Research Council under an Advanced Laureate Award (IRCLA/19/118) and a Government of Ireland Postdoctoral Fellowship (GOIPD/2021/438). We also acknowledge support from the European Union’s Horizon 2020 research and innovation program under grant agreement No 825114. SAH and HG acknowledge support from SFI under grant agreement no. 18/SIRG/5484