Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.



Ionic conduction mechanism of a lithium superionic argyrodite in the Li–Al–Si–S–O system

Author affiliations

Abstract

We report the conduction mechanism in oxygen-substituted lithium conductors composed of the Li6.15Al0.15Si1.35S6−xOx (LASSO) system, which is a novel member of the argyrodite-type family and has superionic conductivities, making it suitable for all-solid-state batteries. The crystal structures, ionic conductivities, and electrochemical properties of these systems were examined using powder X-ray and neutron diffractometry combined with impedance spectroscopy and cyclic voltammetry measurements. The optimal Li6.15Al0.15Si1.35S5.4O0.6 (x = 0.6) material exhibited a high ionic conductivity of 1.24 mS cm−1 at 25 °C with a low activation energy of 36.6 kJ mol−1. Rietveld refinement and maximum-entropy-method analysis using neutron diffraction data revealed unique interstitial Li+ and O2−/S2− site disorder, which led to a flatter energy landscape for migrating Li+ ions and, thus, a low percolation threshold for three dimensional (3D) Li-ion diffusion. Oxygen substitution also stabilized the structure, and a wide electrochemical window from −0.1 V to 5 V vs. Li/Li+ was achieved. The significant improvements in the ionic conductivity and stability owing to structural changes after cation and anion substitutions reveal an important strategy toward the development of argyrodite-type superionic conductors.

Graphical abstract: Ionic conduction mechanism of a lithium superionic argyrodite in the Li–Al–Si–S–O system

Back to tab navigation

Supplementary files

Article information


Submitted
22 Mar 2020
Accepted
20 Apr 2020
First published
22 Apr 2020

This article is Open Access

Mater. Adv., 2020, Advance Article
Article type
Paper

Ionic conduction mechanism of a lithium superionic argyrodite in the Li–Al–Si–S–O system

W. Huang, L. Cheng, S. Hori, K. Suzuki, M. Yonemura, M. Hirayama and R. Kanno, Mater. Adv., 2020, Advance Article , DOI: 10.1039/D0MA00115E

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.


Social activity

Search articles by author

Spotlight

Advertisements