Jump to main content
Jump to site search

Issue 40, 2019
Previous Article Next Article

The influence of silica surface groups on the Li-ion conductivity of LiBH4/SiO2 nanocomposites

Author affiliations

Abstract

Lithium borohydride is a promising lithium ion conductor for all-solid-state batteries. However, the compound only exhibits high ionic conductivity at elevated temperatures, typically above 110 °C. It was shown that the addition of oxides such as silica or alumina increases the room temperature ionic conductivity by 3 orders of magnitude. The origin of this remarkable effect is not yet well understood. Here, we investigate the influence of oxide surface groups on the ionic conductivity of LiBH4/SiO2 nanocomposites. We systematically varied the density and nature of the surface groups of mesoporous silica by heat treatment at different temperatures, or surface functionalization, and subsequently prepared LiBH4/SiO2 nanocomposites by melt infiltration. The ionic conductivity is strongly influenced by the heat treatment temperature, hence the density of the free surface silanol groups. Replacing some of the silanol groups with hydrophobic surface groups resulted in an order of magnitude reduction of the room temperature ionic conductivity, suggesting that their presence is crucial to obtain high ionic conductivity in the nanocomposites. This systematic study and insight provide a basis for further exploration of the impact of surface groups, and for the rational design of novel solid-state nanocomposite electrolytes via interface engineering.

Graphical abstract: The influence of silica surface groups on the Li-ion conductivity of LiBH4/SiO2 nanocomposites

Back to tab navigation

Supplementary files

Publication details

The article was received on 30 Jul 2019, accepted on 16 Sep 2019 and first published on 28 Sep 2019


Article type: Paper
DOI: 10.1039/C9CP04235K
Phys. Chem. Chem. Phys., 2019,21, 22456-22466
  • Open access: Creative Commons BY-NC license
  •   Request permissions

    The influence of silica surface groups on the Li-ion conductivity of LiBH4/SiO2 nanocomposites

    P. Ngene, S. F. H. Lambregts, D. Blanchard, T. Vegge, M. Sharma, H. Hagemann and P. E. de Jongh, Phys. Chem. Chem. Phys., 2019, 21, 22456
    DOI: 10.1039/C9CP04235K

    This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material and it is not used for commercial purposes.

    Reproduced material should be attributed as follows:

    • For reproduction of material from NJC:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
    • For reproduction of material from PCCP:
      [Original citation] - Published by the PCCP Owner Societies.
    • For reproduction of material from PPS:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
    • For reproduction of material from all other RSC journals:
      [Original citation] - Published by The Royal Society of Chemistry.

    Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.

Search articles by author

Spotlight

Advertisements