Skip to Main content Skip to Navigation
Journal articles

Synthesis in Molten Salts and Characterization of Li 6 B 18 (Li 2 O) x Nanoparticles

Abstract : Lithium borides have been synthesized exclusively through classical solid-state chemistry processes that lead to bulk materials. Indeed, due to the lack of reactivity of the solid boron precursors usually employed and to the high covalent connectivity in such solids, high temperatures and long reaction times are necessary to obtain lithium borides. These conditions result in extensive crystal growth. Here we present the synthesis of nanoparticles of a lithium boride bearing tunnel-like cavities templated by neutral Li2O species, which have been reported to be labile. To reach this goal, a liquid-phase synthesis in inorganic molten salts has been developed. The Li6B18(Li2O)x nanoparticles have been characterized by scanning and transmission electronic microscopy (SEM and TEM), X-ray diffraction (XRD), and Raman spectroscopy. We provide an in-depth structural characterization by using 1H, 7Li, and 11B solid-state nuclear magnetic resonance (NMR) coupled with DFT modeling to provide the first assignment of 7Li and 11B solid-state NMR signals in lithium borides. We then assess the nanoparticle morphology oriented along the direction of the cavities. This feature shows similarities with structurally related hexagonal tungsten bronzes and could therefore affect the electrochemical and ion exchange properties.
Complete list of metadatas

Cited literature [24 references]  Display  Hide  Download

https://hal.sorbonne-universite.fr/hal-02993703
Contributor : David Portehault <>
Submitted on : Friday, November 6, 2020 - 11:22:40 PM
Last modification on : Friday, February 19, 2021 - 3:15:30 AM
Long-term archiving on: : Monday, February 8, 2021 - 3:31:21 AM

File

 Restricted access
To satisfy the distribution rights of the publisher, the document is embargoed until : 2021-05-06

Please log in to resquest access to the document

Identifiers

Citation

Simon Delacroix, Yann Le Godec, Cristina Coelho, Christel Gervais, Isabelle Genois, et al.. Synthesis in Molten Salts and Characterization of Li 6 B 18 (Li 2 O) x Nanoparticles. Inorganic Chemistry, American Chemical Society, 2020, 59 (20), pp.14983-14988. ⟨10.1021/acs.inorgchem.0c01694⟩. ⟨hal-02993703⟩

Share

Metrics

Record views

95