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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