Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.
Nat Commun. 2017 Nov 24;8(1):1759. doi: 10.1038/s41467-017-01772-1.
Magnesium batteries appear a viable alternative to overcome the safety and energy density limitations faced by current lithium-ion technology. The development of a competitive magnesium battery is plagued by the existing notion of poor magnesium mobility in solids. Here we demonstrate by using ab initio calculations, nuclear magnetic resonance, and impedance spectroscopy measurements that substantial magnesium ion mobility can indeed be achieved in close-packed frameworks (~ 0.01-0.1 mS cm at 298 K), specifically in the magnesium scandium selenide spinel. Our theoretical predictions also indicate that high magnesium ion mobility is possible in other chalcogenide spinels, opening the door for the realization of other magnesium solid ionic conductors and the eventual development of an all-solid-state magnesium battery.
镁电池似乎是一种可行的替代方案，可以克服当前锂离子技术所面临的安全性和能量密度限制。开发具有竞争力的镁电池受到了现有固体中镁迁移率差的观念的困扰。在这里，我们通过使用从头算计算、核磁共振和阻抗光谱测量证明，在密堆积框架中（在 298 K 时约为 0.01-0.1 mS cm）确实可以实现大量镁离子迁移率，特别是在镁钪硒尖晶石中。我们的理论预测还表明，在其他硫属化物尖晶石中也有可能实现高镁离子迁移率，为实现其他镁固体离子导体和最终开发全固态镁电池打开了大门。
