Mitigating Lattice Distortion of High-Voltage LiCoO₂ via Core-Shell Structure Induced by Cationic Heterogeneous Co-Doping for Lithium-Ion Batteries.

ABSTRACT: Inactive elemental doping is commonly used to improve the structural stability of high-voltage layered transition-metal oxide cathodes. However, the one-step co-doping strategy usually results in small grain size since the low diffusivity ions such as Ti⁴⁺ will be concentrated on grain boundaries, which hinders the grain growth. In order to synthesize large single-crystal layered oxide cathodes, considering the different diffusivities of different dopant ions, we propose a simple two-step multi-element co-doping strategy to fabricate core-shell structured LiCoO₂ (CS-LCO). In the current work, the high-diffusivity Al³⁺/Mg²⁺ ions occupy the core of single-crystal grain while the low diffusivity Ti⁴⁺ ions enrich the shell layer. The Ti

SUBMITTER: Lin Z 

PROVIDER: S-EPMC10713914 | biostudies-literature | 2023 Dec

REPOSITORIES: biostudies-literature