Yinguo Xiao

Keywords Li/Ni anti-site defects shear strength interlayer gliding suppression Ni-rich single-crystal cathodes dopant-free processing oxygen loss inhibition Introduction Ni-rich layered cathode materials such as LiNi0.8Mn0.1Co0.1O2 (NMC811) have gained popularity because of their high capacity and limited cobalt content.1,2 However, these Ni-rich NMC formulations tend to suffer from an accelerated capacity loss, in particular when used at high cutoff voltages.3,4,5,6 A promising strategy to...

Abstract Sodium-ion batteries are among the most promising alternatives to lithium-based technologies for grid and other energy storage applications due to their cost benefits and sustainable resource supply. For the cathode—the component that largely determines the energy density of a sodium-ion battery cell—one major category of materials is P2-type layered oxides.

Abstract In P2-type layered transition metal (TM) oxides, which are typical cathode materials for Na-ion batteries, the presence of Li within the TM layer could lead to the formation of specific Na–O–Li configurations that trigger additional oxygen redox at high charging voltages. However, the prismatic-type (P-type) to octahedral-type (O-type) phase transition and irreversible TM migration could be simultaneously aggravated in high state of charge, resulting in structural distortion.