Lu, Y;
Wang, T;
Naresh, N;
Borowiec, J;
Parkin, IP;
Boruah, BD;
(2024)
Pre-doped cations in V2O5 for high-performance Zn-ion batteries.
Nano Research Energy
, 3
(4)
, Article e9120125. 10.26599/NRE.2024.9120125.
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Abstract
Aqueous rechargeable zinc-ion batteries (ZIBs) have garnered considerable attention due to their safety, cost-effectiveness, and eco-friendliness. There is a growing interest in finding suitable cathode materials for ZIBs. Layered vanadium oxide has emerged as a promising option due to its ability to store zinc ions with high capacity. However, the advancement of high-performance ZIBs encounters obstacles such as sluggish diffusion of zinc ions resulting from the high energy barrier between V2O5 layers, degradation of electrode structure over time and consequently lower capacity than the theoretical value. In this study, we investigated the pre-doping of different cations (including Na+ , K+ , and NH+4 ) into V2O5 to enhance the overall charge storage performance. Our findings indicate that the presence of V4+ enhances the charge storage performance, while the introduction of NH+4 into V2O5 (NH4-V2O5) not only increases the interlayer distance (d(001) = 15.99 Å), but also significantly increases the V4+/V5+ redox couple (atomic concentration ratio increased from 0.14 to 1.08), resulting in the highest electrochemical performance. The NH4-V2O5 cathode exhibited a high specific capacity (310.8 mAh·g–1 at 100 mA·g–1), improved cycling stability, and a significantly reduced charge transfer resistance (~ 17.9 Ω) compared to pristine V2O5 (112.5 mAh·g–1 at 0.1 A·g–1 and ~ 65.58 Ω charge transfer resistance). This study enhances our understanding and contributes to the development of high-capacity cathode materials, offering valuable insights for the design and optimization of cathode materials to enhance the electrochemical performance of ZIBs.
| Type: | Article |
|---|---|
| Title: | Pre-doped cations in V2O5 for high-performance Zn-ion batteries |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.26599/NRE.2024.9120125 |
| Publisher version: | https://doi.org/10.26599/nre.2024.9120125 |
| Language: | English |
| Additional information: | © The Author(s) 2024. Published by Tsinghua University Press. The articles published in this open access journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited |
| Keywords: | pre-doped cations strategy, layered vanadium pentoxide, tuning oxidation states of vanadium, high-charge storage performance, zinc-ion batteries |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences 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 > Dept of Chemistry UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office > Institute for Materials Discovery |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10206565 |
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