Li2 NH-LiBH4 : a Complex Hydride with Near Ambient Hydrogen Adsorption and Fast Lithium Ion Conduction

Han Wang; Hujun Cao; Weijin Zhang; Jian Chen; Hui Wu; Claudio Pistidda; Xiaohua Ju; Wei Zhou; Guotao Wu; Martin Etter; Thomas Klassen; Martin Dornheim; Ping Chen

doi:10.1002/chem.201703910

Li₂ NH-LiBH₄ : a Complex Hydride with Near Ambient Hydrogen Adsorption and Fast Lithium Ion Conduction

Chemistry. 2018 Jan 26;24(6):1342-1347. doi: 10.1002/chem.201703910. Epub 2017 Dec 20.

Authors

Han Wang^{1

2}, Hujun Cao³, Weijin Zhang^{1

2}, Jian Chen⁴, Hui Wu⁵, Claudio Pistidda³, Xiaohua Ju¹, Wei Zhou⁵, Guotao Wu¹, Martin Etter⁶, Thomas Klassen³, Martin Dornheim³, Ping Chen¹

Affiliations

¹ Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian, 116023, P.R. China.
² University of Chinese Academy of Sciences, Beijing, 100049, P.R. China.
³ Institute of Materials Research, Materials Technology, Helmholtz-Zentrum Geesthacht GmbH, Max-Planck-Straße 1, D-21502, Geesthacht, Germany.
⁴ Advanced Rechargeable Battery Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P.R. China.
⁵ NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland, 20899-6102, USA.
⁶ Deutsches Elektronen-Synchrotron, A Research Centre of the Helmholtz Association, Notkestraße 85, Hamburg, Germany.

PMID: 29024174
DOI: 10.1002/chem.201703910

Abstract

Complex hydrides have played important roles in energy storage area. Here a complex hydride made of Li₂ NH and LiBH₄ was synthesized, which has a structure tentatively indexed using an orthorhombic cell with a space group of Pna2₁ and lattice parameters of a=10.121, b=6.997, and c=11.457 Å. The Li₂ NH-LiBH₄ sample (in a molar ratio of 1:1) shows excellent hydrogenation kinetics, starting to absorb H₂ at 310 K, which is more than 100 K lower than that of pristine Li₂ NH. Furthermore, the Li⁺ ion conductivity of the Li₂ NH-LiBH₄ sample is about 1.0×10^-5 S cm^-1 at room temperature, and is higher than that of either Li₂ NH or LiBH₄ at 373 K. Those unique properties of the Li₂ NH-LiBH₄ complex render it a promising candidate for hydrogen storage and Li ion conduction.

Keywords: hydrogen storage; lithium borohydride; lithium imide; lithium ion conductor.