Download file (2.29 MB)
Download as zip (1.78 MB)

Collection

Citation

Description:

The cathode surface of sulfide-based all-solid-state batteries (SBs) is
commonly coated with amorphous-LiNbO3 in order to stabilize
charge–discharge reactions. However, high-voltage charging diminishes the
advantages, which is caused by problems with the amorphous-LiNbO3
coating layer. This study has investigated the degradation of
amorphous-LiNbO3 coating layer directly during the high-voltage charging of
SBs. O2 generation via Li extraction from the amorphous-LiNbO3 coating
layer is observed using electrochemical gas analysis and electrochemical X-ray
photoelectron spectroscopy. This O2 leads to the formation of an oxidative
solid electrolyte (SE) around the coating layer and degrades the battery
performance. On the other hand, elemental substitution (i.e.,
amorphous-LiNbxP1-xO3) reduces O2 release, leading to stable high-voltage
charge–discharge reactions of SBs. The results have emphasized that the
suppression of O2 generation is a key factor in improving the energy density
of SBs.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: all-solid-state battery, electrochemistry, energy conversion, interfaces, mass spectrometry

Date published: 2024-07-08

Publisher: Wiley

Journal:

• Advanced Science (ISSN: 21983844)

Funding:

• Japan Society for the Promotion of Science London JP19H05814
• New Energy and Industrial Technology Development Organization JPNP23005

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1002/advs.202402528

Related item:

Other identifier(s):

Contact agent:

Updated at: 2024-07-09 16:30:22 +0900

Published on MDR: 2024-07-09 16:30:23 +0900