Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Synergistic Theoretical and Experimental Insights into NH₄⁺-Enhanced Vanadium Oxide Cathodes for Aqueous Zinc-Ion Batteries

Version 1 : Received: 13 May 2024 / Approved: 13 May 2024 / Online: 13 May 2024 (17:01:09 CEST)

How to cite: Lin, H.; Xu, J.; Zhang, Y. Synergistic Theoretical and Experimental Insights into NH₄⁺-Enhanced Vanadium Oxide Cathodes for Aqueous Zinc-Ion Batteries. Preprints 2024, 2024050878. https://doi.org/10.20944/preprints202405.0878.v1 Lin, H.; Xu, J.; Zhang, Y. Synergistic Theoretical and Experimental Insights into NH₄⁺-Enhanced Vanadium Oxide Cathodes for Aqueous Zinc-Ion Batteries. Preprints 2024, 2024050878. https://doi.org/10.20944/preprints202405.0878.v1

Abstract

This study explores the enhancement of aqueous zinc-ion batteries (AZIBs) using ammonium-enhanced vanadium oxide cathodes. Density Functional Theory (DFT) calculations reveal that NH₄⁺ incorporation into V₆O₁₆ lattices significantly facilitates Zn²⁺ ion diffusion by reducing electrostatic interactions, acting as a structural lubricant. Subsequent experimental validation using (NH₄)₂V₆O₁₆ cathodes synthesized via a hydrothermal method corroborates the DFT findings, demonstrating remarkable electrochemical stability with a capacity retention of 90% after 2000 cycles at 5 A g⁻¹. These results underscore the potential of NH₄⁺ in improving the performance and longevity of AZIBs, providing a pathway for sustainable energy storage solutions.

Keywords

zinc-ion batteries; cathode materials; ammonium; vanadium oxide

Subject

Chemistry and Materials Science, Electrochemistry

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