Designing Highly Conductive Sodium?Based Metal Hydride Nanocomposites: Interplay between Hydride and Oxide Properties

Sodium-based complex hydrides have recently gained interest as electrolytes for all-solid-state batteries due to their light weight and high electrochemical stability. Although room temperature conductivities are not sufficiently battery application, nanocomposite formation with metal oxides has emerged a promising approach enhance the ionic conductivity of hydrides. This enhancement is generally attributed space charge layer at hydride-oxide interface. However, in this study it found that results from interface reactions between hydride oxide. Highly conductive NaBH4 NaNH2/oxide nanocomposites obtained by optimizing reaction, which strongly depends on interplay surface chemistry reactivity Notably, NaBH4, best performance Al2O3, while NaNH2/SiO2 most of, respectively, 4.7 × 10?5 2.1 S cm?1 80 °C. Detailed structural characterization reveals disparity originates different tertiary interfacial compounds, only effect. These provide useful insights preparation highly interactions.