Surface enrichment and diffusion enabling gradient-doping and coating of Ni-rich cathode toward Li-ion batteries.

ABSTRACT: Critical barriers to layered Ni-rich cathode commercialisation include their rapid capacity fading and thermal runaway from crystal disintegration and their interfacial instability. Structure combines surface modification is the ultimate choice to overcome these. Here, a synchronous gradient Al-doped and LiAlO₂-coated LiNi_0.9Co_0.1O₂ cathode is designed and prepared by using an oxalate-assisted deposition and subsequent thermally driven diffusion method. Theoretical calculations, in situ X-ray diffraction results and finite-element simulation verify that Al³⁺ moves to the tetrahedral interstices prior to Ni²⁺ that eliminates the Li/Ni disorder and internal structure stress. The Li⁺-conductive LiAlO₂ skin

SUBMITTER: Yu H 

PROVIDER: S-EPMC8316340 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature