Multi-scale Investigations of δ-Ni0.25V2O5.nH2O Cathode Materials in Aqueous Zinc-ion Batteries

Li, Lianwei, McColl, Kit, Lu, Xuekun, Sathasivam, Sanjayan, Zhao, Siyu, Kafizas, Andreas G., Wang, Ryan, Brett, Dan J. L., Shearing, Paul R., Corà, Furio, He, Guanjie, Carmalt, Claire J. and Parkin, Ivan P. (2020) Multi-scale Investigations of δ-Ni0.25V2O5.nH2O Cathode Materials in Aqueous Zinc-ion Batteries. Advanced Energy Materials (200005). ISSN 1614-6832

Full content URL: https://doi.org/10.1002/aenm.202000058

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Multi-scale Investigations of δ-Ni0.25V2O5.nH2O Cathode Materials in Aqueous Zinc-ion Batteries
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Abstract

Cost-effective and environmentally friendly aqueous zinc-ion batteries (AZIB) exhibit tremendous potential for application in grid-scale energy storage systems but are limited by suitable cathode materials. Hydrated vanadium bronzes have gained significant attention for AZIBs and can be produced with a range of different pre-intercalated ions, allowing their properties to be optimised. However, gaining a detailed understanding of the energy storage mechanisms within these cathode materials remains a great challenge due to their complex crystallographic frameworks, limiting rational design from the perspective of enhanced Zn2+ diffusion over multiple length scales. Herein, we report on a new class of hydrated porous δ-Ni0.25V2O5.nH2O nanoribbons for use as an AZIB cathode. The cathode delivers reversibility showing 402 mAh g-1 at 0.2 A g-1 and a capacity retention of 98 % over 1200 cycles at 5 A g-1. A detailed investigation using experimental and computational approaches reveal that the host ‘δ’ vanadate lattice has favourable Zn2+ diffusion properties, arising from the atomic-level structure of the well-defined lattice channels. Furthermore, the microstructure of the asprepared cathodes is examined using multi-length scale X-ray computed tomography for the first time in AZIBs and the effective diffusion coefficient is obtained by image-based modelling, illustrating favourable porosity and satisfactory tortuosity.

Keywords:Zn-ion battery, cathode, DFT calculation, 3D tomography
Subjects:F Physical Sciences > F120 Inorganic Chemistry
F Physical Sciences > F100 Chemistry
Divisions:College of Science > School of Chemistry
ID Code:40127
Deposited On:06 Mar 2020 10:15

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