Investigation into the ability of langbeinite-type K2M2(SO4)3 (M = Mn, Fe, Co and Ni) materials to accommodate Na: The importance of the electronegativity of the framework cation
作者:L.L. Driscoll、E.H. Driscoll、P.R. Slater
DOI:10.1016/j.jssc.2020.121363
日期:2020.7
langbeinite-type K2-xNaxM2(SO4)3 materials (M = Mn, Fe, Co and Ni) in order to evaluate the level of Na incorporation possible. The work showed that the level of Na incorporation decreased across the transition metal series, with the highest level of Na incorporation (up to x=1.3) observed for M=Mn. This trend does not appear to be related to the ionic radius of the transition metal, but rather its' electronegativity
在这项工作中,我们报告了对兰贝石型K 2-x Na x M 2(SO 4)3材料(M = Mn,Fe,Co和Ni)的研究,以评估可能的Na掺入水平。这项工作表明,在过渡金属系列中,Na的掺入量下降,对于M = Mn,Na的掺入量最高(最高x = 1.3)。这种趋势似乎与过渡金属的离子半径无关,而与它的电负性有关。我们通过包括先前关于K 2-x Na x Mg 2(SO 4)3的工作来说明这种关系。其中甚至可能有更高水平的Na,并证明通过与Mg共掺杂,对于K 2-x Na x M 2(SO 4)3材料(M = Mn,Fe)可以达到更高的Na水平。对二价阳离子电负性的依赖性归因于更大的电负性,导致骨架的极化增强,因此,当较小的Na阳离子“移向”骨架框架的边缘时,可以更好地稳定它,从而更好地实现其“配位”要求。鉴于对钠离子电池应用相关系统的兴趣,这项工作为设计用于此类应用的新材料提供了一个新的考虑因素。