Restraining the escape of lattice oxygen enables superior cyclic performance towards high-voltage Ni-rich cathodes.

ABSTRACT: Layered Ni-rich cathodes, operating at high voltage with superior cyclic performance, are required to develop future high-energy Li-ion batteries. However, the worst lattice oxygen escape at the high-voltage region easily causes structural instability, rapid capacity fading and safety issues upon cycling. Here, we report a dual-track strategy to fully restrain the escape of lattice oxygen from Ni-rich cathodes within 2.7-4.5 V by one-step Ta doping and CeO₂ coating according to their different diffusion energy barriers. The doped Ta can alleviate the charge compensation of oxygen anions as a positive charge centre to reduce the lattice oxygen escape and induce the formation of elongated primary particles, significantly inhibiting microcrack generation and propagation. Additional

SUBMITTER: Yu H 

PROVIDER: S-EPMC9843122 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature