Dobbins Tabbetha A
Department of Physics and Astronomy, Rowan University, Glassboro, NJ 08028, USA.
Molecules. 2021 May 28;26(11):3239. doi: 10.3390/molecules26113239.
The goal of this article is to highlight crucial breakthroughs in solid-state ionic conduction in borohydrides for battery applications. Borohydrides, MBH, form in various molecular structures, for example, nido-MBH; closo-MBH; closo-MBH; and planar-MBH with M = cations such as Li, K, Na, Ca, and Mg, which can participate in ionic conduction. This overview article will fully explore the phase space of boron-hydrogen chemistry in order to discuss parameters that optimize these materials as solid electrolytes for battery applications. Key properties for effective solid-state electrolytes, including ionic conduction, electrochemical window, high energy density, and resistance to dendrite formation, are also discussed. Because of their open structures (for closo-boranes) leading to rapid ionic conduction, and their ability to undergo phase transition between low conductivity and high conductivity phases, borohydrides deserve a focused discussion and further experimental efforts. One challenge that remains is the low electrochemical stability of borohydrides. This overview article highlights current knowledge and additionally recommends a path towards further computational and experimental research efforts.
本文的目标是突出硼氢化物在电池应用中固态离子传导方面的关键突破。硼氢化物MBH具有多种分子结构，例如，巢式-MBH；闭式-MBH；闭式-MBH；以及平面-MBH，其中M为Li、K、Na、Ca和Mg等阳离子，这些阳离子可参与离子传导。这篇综述文章将全面探索硼氢化学的相空间，以讨论将这些材料优化为电池应用固态电解质的参数。还讨论了有效固态电解质的关键特性，包括离子传导、电化学窗口、高能量密度和抗枝晶形成能力。由于其开放结构（对于闭式硼烷）导致快速离子传导，以及它们在低电导率和高电导率相之间发生相变的能力，硼氢化物值得进行重点讨论和进一步的实验研究。仍然存在的一个挑战是硼氢化物的电化学稳定性较低。这篇综述文章突出了当前的知识，并额外推荐了一条进一步开展计算和实验研究工作的路径。
