The Impact of Aluminum Doping on the Performance of MgV<sub>2</sub>O<sub>4</sub> Spinel Cathodes for High-Rate Zinc-Ion Energy Storage

The Impact of Aluminum Doping on the Performance of MgV<sub>2</sub>O<sub>4</sub> Spinel Cathodes for High-Rate Zinc-Ion Energy Storage

This study explores the development of aluminum-doped MgV<sub>2</sub>O<sub>4</sub> spinel cathodes for aqueous zinc-ion batteries (AZIBs), addressing the challenges of poor Zn<sup>2+</sup> ion diffusion and structural instability. Al<sup>3+</sup> ions...

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Bibliographic Details
Main Authors: He Lin, Zhiwen Wang, Yu Zhang
Format: Article
Language:English
Published: MDPI AG 2025-07-01
Series:Molecules
Subjects:
zinc-ion batteries
cathode materials
vanadium oxide
aluminum doping
Online Access:https://www.mdpi.com/1420-3049/30/13/2833
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Summary:This study explores the development of aluminum-doped MgV<sub>2</sub>O<sub>4</sub> spinel cathodes for aqueous zinc-ion batteries (AZIBs), addressing the challenges of poor Zn<sup>2+</sup> ion diffusion and structural instability. Al<sup>3+</sup> ions were pre-inserted into the spinel structure using a sol-gel method, which enhanced the material’s structural stability and electrical conductivity. The doping of Al<sup>3+</sup> mitigates the electrostatic interactions between Zn<sup>2+</sup> ions and the cathode, thereby improving ion diffusion and facilitating efficient charge/discharge processes. While pseudocapacitive behavior plays a dominant role in fast charge storage, the diffusion of Zn<sup>2+</sup> within the bulk material remains crucial for long-term performance and stability. Our findings demonstrate that Al-MgV<sub>2</sub>O<sub>4</sub> exhibits enhanced Zn<sup>2+</sup> diffusion kinetics and robust structural integrity under high-rate cycling conditions, contributing to its high electrochemical performance. The Al-MgVO cathode retains a capacity of 254.3 mAh g<sup>−1</sup> at a high current density of 10 A g<sup>−1</sup> after 1000 cycles (93.6% retention), and 186.8 mAh g<sup>−1</sup> at 20 A g<sup>−1</sup> after 2000 cycles (90.2% retention). These improvements, driven by enhanced bulk diffusion and the stabilization of the crystal framework through Al<sup>3+</sup> doping, make it a promising candidate for high-rate energy storage applications.
ISSN:1420-3049

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