Wei Luyao, Lian Ruqian, Wang Dashuai, Zhao Yingying, Yang Di, Zhao Hainan, Wang Yizhan, Chen Gang, Wei Yingjin
Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), Jilin Engineering Laboratory of New Energy Materials and Technology, College of Physics, Jilin University, Changchun 130012, P.R. China.
School of Physical Science and Technology, Hebei University, Baoding 071002, P.R. China.
ACS Appl Mater Interfaces. 2021 Jul 7;13(26):30625-30632. doi: 10.1021/acsami.1c06398. Epub 2021 Jun 25.
Magnesium ion batteries have attracted increasing attention as a promising energy storage device due to the high safety, high volumetric capacity, and low cost of Mg. However, the strong Coulombic interactions between Mg ions and cathode materials seriously hinder the electrochemical performance of the batteries. To seek a promising cathode material for magnesium ion batteries, in this work, (NH)VO·1.5HO and water-free (NH)VO materials are synthesized by a one-step hydrothermal method. The effects of NH and lattice water on the Mg storage properties in these kinds of layered cathode materials are investigated by experiments and first-principles calculations. Lattice water is demonstrated to be of vital importance for Mg storage, which not only stabilizes the layered structure of (NH)VO·1.5HO but also promotes the transport kinetics of Mg. Electrochemical experiments of (NH)VO·1.5HO show a specific capacity of 100 mA·h·g with an average discharge voltage of 2.16 V vs Mg/Mg, highlighting the potential of (NH)VO·1.5HO as a high-voltage cathode material for magnesium ion batteries.
镁离子电池作为一种很有前景的储能装置，因其高安全性、高体积容量和镁的低成本而受到越来越多的关注。然而，镁离子与阴极材料之间强烈的库仑相互作用严重阻碍了电池的电化学性能。为了寻找一种有前景的镁离子电池阴极材料，在这项工作中，通过一步水热法合成了(NH)VO·1.5HO和无水(NH)VO材料。通过实验和第一性原理计算研究了NH和晶格水对这类层状阴极材料储镁性能的影响。结果表明，晶格水对储镁至关重要，它不仅稳定了(NH)VO·1.5HO的层状结构，还促进了镁的传输动力学。(NH)VO·1.5HO的电化学实验表明，其比容量为100 mA·h·g，相对于Mg/Mg的平均放电电压为2.16 V，突出了(NH)VO·1.5HO作为镁离子电池高压阴极材料的潜力。
