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Structural engineering of cathodes for improved Zn-ion batteries

Huang, J; Li, Y; Xie, R; Li, J; Tian, Z; Chai, G; Zhang, Y; ... Brett, DJL; + view all (2021) Structural engineering of cathodes for improved Zn-ion batteries. Journal of Energy Chemistry , 58 pp. 147-155. 10.1016/j.jechem.2020.09.035. Green open access

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Abstract

Aqueous zinc-ion batteries (ZIBs) are attracting considerable attention because of their low cost, high safety and abundant anode material resources. However, the major challenge faced by aqueous ZIBs is the lack of stable and high capacity cathode materials due to their complicated reaction mechanism and slow Zn-ion transport kinetics. This study reports a unique 3D ‘flower-like’ zinc cobaltite (ZnCo2O4-x) with enriched oxygen vacancies as a new cathode material for aqueous ZIBs. Computational calculations reveal that the presence of oxygen vacancies significantly enhances the electronic conductivity and accelerates Zn2+ diffusion by providing enlarged channels. The as-fabricated batteries present an impressive specific capacity of 148.3 mAh g−1 at the current density of 0.05 A g−1, high energy (2.8 Wh kg−1) and power densities (27.2 W kg−1) based on the whole device, which outperform most of the reported aqueous ZIBs. Moreover, a flexible solid-state pouch cell was demonstrated, which delivers an extremely stable capacity under bending states. This work demonstrates that the performance of Zn-ion storage can be effectively enhanced by tailoring the atomic structure of cathode materials, guiding the development of low-cost and eco-friendly energy storage materials.

Type: Article
Title: Structural engineering of cathodes for improved Zn-ion batteries
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.jechem.2020.09.035
Publisher version: https://doi.org/10.1016/j.jechem.2020.09.035
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Zinc cobaltite, Oxygen vacancies, Aqueous zinc-ion batteries, Flexible solid-state pouch cell
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10113374
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