Lin He, Wang Zhiwen, Zhang Yu
A State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, School of Chemistry, Xinjiang University, Urumqi 830017, China.
Molecules. 2025 Jul 1;30(13):2833. doi: 10.3390/molecules30132833.
This study explores the development of aluminum-doped MgVO spinel cathodes for aqueous zinc-ion batteries (AZIBs), addressing the challenges of poor Zn ion diffusion and structural instability. Al 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 mitigates the electrostatic interactions between Zn 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 within the bulk material remains crucial for long-term performance and stability. Our findings demonstrate that Al-MgVO exhibits enhanced Zn 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 at a high current density of 10 A g after 1000 cycles (93.6% retention), and 186.8 mAh g at 20 A g after 2000 cycles (90.2% retention). These improvements, driven by enhanced bulk diffusion and the stabilization of the crystal framework through Al doping, make it a promising candidate for high-rate energy storage applications.
本研究探索了用于水系锌离子电池（AZIBs）的铝掺杂MgVO尖晶石阴极的发展，解决了锌离子扩散不良和结构不稳定的挑战。采用溶胶-凝胶法将铝离子预插入尖晶石结构中，增强了材料的结构稳定性和电导率。铝的掺杂减轻了锌离子与阴极之间的静电相互作用，从而改善了离子扩散并促进了高效的充放电过程。虽然赝电容行为在快速电荷存储中起主导作用，但锌在块状材料中的扩散对于长期性能和稳定性仍然至关重要。我们的研究结果表明，Al-MgVO在高倍率循环条件下表现出增强的锌扩散动力学和稳健的结构完整性，这有助于其高电化学性能。Al-MgVO阴极在1000次循环后，在10 A g的高电流密度下保持254.3 mAh g的容量（保留率93.6%），在20 A g下经过2000次循环后保持186.8 mAh g的容量（保留率90.2%）。这些改进是由增强的体扩散和通过铝掺杂实现的晶体框架稳定驱动的，使其成为高倍率储能应用的有前途的候选材料。
