Surface Chemistry Dependence on Aluminum Doping in Ni-rich LiNi_0.8Co_0.2-yAl_yO₂ Cathodes.

ABSTRACT: Aluminum is a common dopant across oxide cathodes for improving the bulk and cathode-electrolyte interface (CEI) stability. Aluminum in the bulk is known to enhance structural and thermal stability, yet the exact influence of aluminum at the CEI remains unclear. To address this, we utilized a combination of X-ray photoelectron and absorption spectroscopy to identify aluminum surface environments and extent of transition metal reduction for Ni-rich LiNi_0.8Co_0.2-yAlyO₂ (0%, 5%, or 20% Al) layered oxide cathodes tested at 4.75 V under thermal stress (60 °C). For these tests, we compared the conventional LiPF₆ salt with the more thermally stable LiBF₄ salt. The CEI layers are inherently different between these two electrolyte salts, partic

SUBMITTER: Lebens-Higgins ZW 

PROVIDER: S-EPMC6881288 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature