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Defected vanadium bronzes as superb cathodes in aqueous zinc-ion batteries

Li, J; Luo, N; Wan, F; Zhao, S; Li, Z; Li, W; Guo, J; ... Parkin, IP; + view all (2020) Defected vanadium bronzes as superb cathodes in aqueous zinc-ion batteries. Nanoscale , 12 (40) pp. 20638-20648. 10.1039/d0nr03394d. Green open access

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Abstract

There is a growing need for fast, efficient, safe, and low-cost energy storage. Aqueous zinc-ion batteries (AZIBs) may be able to address this need, but suffer from fast capacity fade and poor ion diffusion kinetics due to unstable structures and non-optimised interspacing of layered cathode materials. Herein, we propose a structural engineering strategy by synergistically inducing anionic defects and cationic groups within vanadium bronze structures to improve kinetics and boost capacity. The materials discovered and used as the cathodes in AZIBs showed a high capacity of 435 mA h g-1 at a current density of 0.2 A g-1 and excellent stability with 95% capacity retention after 1500 cycles at 10 A g-1. This combined experimental and computational study systemically indicated that rapid Zn2+ storage was achieved from both a highly porous structure and enlarged d-spacing combined with improved electron conductivity as determined by density of states calculations. The modification of vanadium bronze-type cathodes achieved by controlled pre-intercalated species and tailored oxygen deficiency opens up an avenue for the realization of superior material design, whose feasibility is proved in this work.

Type: Article
Title: Defected vanadium bronzes as superb cathodes in aqueous zinc-ion batteries
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1039/d0nr03394d
Publisher version: https://doi.org/10.1039/d0nr03394d
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.
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/10105336
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