uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Ionic conductivity and the formation of cubic CaH2 in the LiBH4–Ca(BH4)2 composite
Technical University of Denmark.
Technical University of Denmark.
Technical University of Denmark.
Technical University of Denmark.ORCID iD: 0000-0003-2538-8104
Show others and affiliations
2014 (English)In: Journal of Solid State Chemistry, ISSN 0022-4596, E-ISSN 1095-726X, Vol. 211, no 0, 81-89 p.Article in journal (Refereed) Published
Abstract [en]

Abstract LiBH4–Ca(BH4)2 composites were prepared by ball milling. Their crystal structures and phase composition were investigated using synchrotron X-ray diffraction and Rietveld refinement, and their ionic conductivity was measured using impedance spectroscopy. The materials were found to form a physical mixture. The composites were composed of α-Ca(BH4)2, γ-Ca(BH4)2 and orthorhombic LiBH4, and the relative phase quantities of the Ca(BH4)2 polymorphs varied significantly with LiBH4 content. The formation of small amounts of orthorhombic CaH2 and cubic CaH2 in a CaF2-like structure was observed upon heat treatment. Concurrent formation of elemental boron may also occur. The ionic conductivity of the composites was measured using impedance spectroscopy, and was found to be lower than that of ball milled LiBH4. Electronic band structure calculations indicate that cubic CaH2 with hydrogen defects is electronically conducting. Its formation along with the possible precipitation of boron therefore has an effect on the measured conductivity of the LiBH4–Ca(BH4)2 composites and may increase the risk of an internal short-circuit in the cells.

Place, publisher, year, edition, pages
2014. Vol. 211, no 0, 81-89 p.
Keyword [en]
Lithium borohydride, Calcium borohydride, Calcium hydride, Solid electrolyte, Ionic conductivity, X-ray diffraction
National Category
Materials Chemistry
URN: urn:nbn:se:uu:diva-242778DOI: 10.1016/j.jssc.2013.12.006OAI: oai:DiVA.org:uu-242778DiVA: diva2:785041
Available from: 2015-02-02 Created: 2015-02-02 Last updated: 2015-02-02

Open Access in DiVA

No full text

Other links

Publisher's full texthttp://www.sciencedirect.com/science/article/pii/S0022459613005938

Search in DiVA

By author/editor
Younesi, Reza
In the same journal
Journal of Solid State Chemistry
Materials Chemistry

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 197 hits
ReferencesLink to record
Permanent link

Direct link