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arXiv 1907.03320cond-mat.mtrl-sciphysics.chem-phphysics.comp-ph
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镁电池电位涂层材料中的离子输运

Ionic Transport in Potential Coating Materials for Mg Batteries

Tina Chen, Gopalakrishnan Sai Gautam, Pieremanuele Canepa

摘要:

镁电池发展的一个主要瓶颈是同时与镁金属阳极和高压阴极相容的液体电解质的鉴定。拓宽当前非水电解质的稳定性窗口的一种策略是在电极处引入保护性涂层材料,其中涂层材料需要表现出快速的Mg传输。在这项工作中,我们使用的组合第一性原理计算和离子传输理论,以评估迁移障碍近27含镁的二元,三元和四元化合物跨越广泛的化学空间。结合迁移率、电子带隙和稳定性要求,我们确定MgSiN $_2$、MgI $_2$、MgBr $_2$、MgSe和MgS作为对抗高度还原性Mg金属阳极的潜在涂层材料,并且我们发现MgAl $_2$ O $_4$和Mg(PO $_3$)$_2$是对抗高压氧化物阴极(高达$\sim$ 3~V)的有前景的材料。

英文摘要:

A major bottleneck for the development of Mg batteries is the identification of liquid electrolytes that are simultaneously compatible with the Mg-metal anode and high-voltage cathodes. One strategy to widen the stability windows of current non-aqueous electrolytes is to introduce protective coating materials at the electrodes, where coating materials are required to exhibit swift Mg transport. In this work, we use a combination of first-principles calculations and ion-transport theory to evaluate the migration barriers for nearly 27 Mg-containing binary, ternary, and quaternary compounds spanning a wide chemical space. Combining mobility, electronic band gaps, and stability requirements, we identify MgSiN$_2$, MgI$_2$, MgBr$_2$, MgSe, and MgS as potential coating materials against the highly reductive Mg metal anode, and we find MgAl$_2$O$_4$ and Mg(PO$_3$)$_2$ to be promising materials against high-voltage oxide cathodes (up to $\sim$3~V).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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