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Ice‐Templated, Sustainable Carbon Aerogels with Hierarchically Tailored Channels for Sodium‐ and Potassium‐Ion Batteries
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Zhen Xu ,
Jean‐Charles Eloi ,
Maria‐Magdalena Titirici ,
Stephen J. Eichhorn
Advanced Functional Materials, Volume: 32, Issue: 16
Swansea University Author:
Jing Wang
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DOI (Published version): 10.1002/adfm.202110862
Abstract
Sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs) are prospective candidates for large-scale energy storage systems cause of their abundant resources. However, unsatisfactory rate and cycling performance of carbon-based anodes present a bottleneck for the applications of SIBs/PIBs due t...
| Published in: | Advanced Functional Materials |
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| ISSN: | 1616-301X 1616-3028 |
| Published: |
Wiley
2022
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa66853 |
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| Abstract: |
Sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs) are prospective candidates for large-scale energy storage systems cause of their abundant resources. However, unsatisfactory rate and cycling performance of carbon-based anodes present a bottleneck for the applications of SIBs/PIBs due to the large sizes of sodium/potassium ions. Herein, oxygen-doped vertically aligned carbon aerogels (VCAs) with hierarchically tailored channels are synthesized as anodes in SIBs/PIBs via a controllable unidirectional ice-templating technique. VCA-3 (cooling rate of 3 K min−1) delivers the highest reversible capacity of ≈298 mAh g−1 at 0.1 C with an excellent cycling performance over 2000 cycles at 0.5 C for SIBs, while VCA-5 manifests a superior capacity of ≈258 mAh g−1 at 0.1 C with an 82.7% retention over 1000 cycles at 0.5 C for PIBs. Moreover, their full cells demonstrate the promising potential of VCAs in applications. This novel controllable ice-templating strategy opens unique avenues to tune the construction of hollow aligned channels for shortening ion-transport pathways and ensuring structural integrity. New insights into structure-performance correlations regulated by the cooling rates of an ice-templating strategy and design guidelines for electrodes applicable in multiple energy storage technologies are reported. |
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| Keywords: |
hard carbon anodes; sodium/potassium-ion full cells; sustainable aerogels; unidirectional ice-templating |
| College: |
Faculty of Science and Engineering |
| Funders: |
Engineering and Physical Sciences Research Council. Grant Number: EP/V002651/1
Chemical Imaging Facility at the University of Bristol |
| Issue: |
16 |