Stabilizing nickel-rich layered oxide cathodes by magnesium doping for rechargeable lithium-ion batteries.

ABSTRACT: Nickel-rich layered transition metal oxides are attractive cathode materials for rechargeable lithium-ion batteries but suffer from inherent structural and thermal instabilities that limit the deliverable capacity and cycling performance on charging to a cutoff voltage above 4.3 V. Here we report LiNi_0.90Co_0.07Mg_0.03O₂ as a stable cathode material. The obtained LiNi_0.90Co_0.07Mg_0.03O₂ microspheres exhibit high capacity (228.3 mA h g^-1 at 0.1C) and remarkable cyclability (84.3% capacity retention after 300 cycles). Combined X-ray diffraction and Cs-corrected microscopy reveal that Mg doping stabilizes the layered structure by suppressing Li/Ni cation mixing and Ni migration to interlayer Li sla

SUBMITTER: Li H 

PROVIDER: S-EPMC6354825 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature