The Li5(BH4)3NH complex hydride, obtained by ball milling LiBH4 and Li2NH in various molar ratios, has been investigated. Using X-ray powder diffraction analysis the crystalline phase has been indexed with an orthorhombic unit cell with lattice parameters a = 10.2031(3), b = 11.5005(2), and c = 7.0474(2) Å at 77 °C. The crystal structure of Li5(BH4)3NH has been solved in space group Pnma, and refined coupling density functional theory (DFT) and synchrotron radiation X-ray powder diffraction data have been obtained for a 3LiBH4:2Li2NH ball-milled and annealed sample. Solid-state nuclear magnetic resonance measurements confirmed the chemical shifts calculated by DFT from the solved structure. The DFT calculations confirmed the ionic character of this lithium-rich compound. Each Li+ cation is coordinated by three BH4– and one NH2– anion in a tetrahedral configuration. The room-temperature ionic conductivity of the new orthorhombic compound is close to10–6 S/cm at room temperature, with activation energy of 0.73 eV.

Li5(BH4)3NH: Lithium-Rich Mixed Anion Complex Hydride

WOLCZYK, Anna Roza;NERVI, Carlo;CHIEROTTI, Michele Remo;GOBETTO, Roberto;BARICCO, Marcello
2017-01-01

Abstract

The Li5(BH4)3NH complex hydride, obtained by ball milling LiBH4 and Li2NH in various molar ratios, has been investigated. Using X-ray powder diffraction analysis the crystalline phase has been indexed with an orthorhombic unit cell with lattice parameters a = 10.2031(3), b = 11.5005(2), and c = 7.0474(2) Å at 77 °C. The crystal structure of Li5(BH4)3NH has been solved in space group Pnma, and refined coupling density functional theory (DFT) and synchrotron radiation X-ray powder diffraction data have been obtained for a 3LiBH4:2Li2NH ball-milled and annealed sample. Solid-state nuclear magnetic resonance measurements confirmed the chemical shifts calculated by DFT from the solved structure. The DFT calculations confirmed the ionic character of this lithium-rich compound. Each Li+ cation is coordinated by three BH4– and one NH2– anion in a tetrahedral configuration. The room-temperature ionic conductivity of the new orthorhombic compound is close to10–6 S/cm at room temperature, with activation energy of 0.73 eV.
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http://dx.doi.org/10.1021/acs.jpcc.7b00821
Wolczyk, Anna; Paik, Biswajit; Sato, Toyoto; Nervi, Carlo; Brighi, Matteo; Gharibdoust, SeyedHosein Payandeh; Chierotti, Michele; Matsuo, Motoaki; Li, Guanqiao; Gobetto, Roberto; Jensen, Torben R.; Černý, Radovan; Orimo, Shin-ichi; Baricco, Marcello
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1637919
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