Limitations of Ultrathin Al₂O₃ Coatings on LNMO Cathodes.

ABSTRACT: This study demonstrates the application of Al₂O₃ coatings for the high-voltage cathode material LiNi_0.5-x Mn_1.5+x O_4-δ (LNMO) by atomic layer deposition. The ultrathin and uniform coatings (0.6-1.7 nm) were deposited on LNMO particles and characterized by scanning transmission electron microscopy, inductively coupled plasma mass spectrometry, and X-ray photoelectron spectroscopy. Galvanostatic charge discharge cycling in half cells revealed, in contrast to many published studies, that even coatings of a thickness of 1 nm were detrimental to the cycling performance of LNMO. The complete coverage of the LNMO particles by the Al₂O₃ coating can form a Li-ion diffusion barrier, which leads to high overpot

SUBMITTER: Ostli ER 

PROVIDER: S-EPMC8603187 | biostudies-literature | 2021 Nov

REPOSITORIES: biostudies-literature