de Kort Laura M, Gulino Valerio, Blanchard Didier, Ngene Peter
Materials Chemistry and Catalysis, Department of Chemistry, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CS Utrecht, The Netherlands.
The European Synchrotron Facility (ESRF), 71 Avenue des Martyrs, 38000 Grenoble, France.
Molecules. 2022 Mar 28;27(7):2187. doi: 10.3390/molecules27072187.
Complex hydrides, such as LiBH, are a promising class of ion conductors for all-solid-state batteries, but their application is constrained by low ion mobility at room temperature. Mixing with halides or complex hydride anions, i.e., other complex hydrides, is an effective approach to improving the ionic conductivity. In the present study, we report on the reaction of LiBH with LiBF, resulting in the formation of conductive composites consisting of LiBH, LiF and lithium -borates. It is believed that the in-situ formation of -borate related species gives rise to highly conductive interfaces in the decomposed LiBH matrix. As a result, the ionic conductivity is improved by orders of magnitude with respect to the Li-ion conductivity of the LiBH, up to 0.9 × 10 S cm at 30 °C. The insights gained in this work show that the incorporation of a second compound is a versatile method to improve the ionic conductivity of complex metal hydrides, opening novel synthesis pathways not limited to conventional substituents.
诸如LiBH等复合氢化物是一类很有前景的用于全固态电池的离子导体，但其应用受到室温下离子迁移率低的限制。与卤化物或复合氢化物阴离子（即其他复合氢化物）混合是提高离子电导率的有效方法。在本研究中，我们报道了LiBH与LiBF的反应，结果形成了由LiBH、LiF和锂硼酸盐组成的导电复合材料。据信，硼酸盐相关物种的原位形成在分解的LiBH基体中产生了高导电界面。因此，相对于LiBH的锂离子电导率，离子电导率提高了几个数量级，在30°C时高达0.9×10 S cm。这项工作中获得的见解表明，引入第二种化合物是提高复合金属氢化物离子电导率的通用方法，开辟了不限于传统取代基的新型合成途径。
