Regulating Lattice Robustness and Lithium-Ion Kinetics via Complex Multielement Substitution for Durable LiNiO ₂ Cathodes

LiNiO₂ (LNO), as the ultimate form of Ni-rich layered cathodes with a capacity exceeding 230 mAh g⁻¹, faces severe challenges including Li⁺/Ni²⁺ cation disordering, high interfacial reactivity, and lattice instability, which collectively lead to sluggish Li⁺ kinetics, parasitic side reactions, and detrimental phase transitions during cycling. Conventional strategies such as elemental doping and surface coating fail to simultaneously address the trade-off between capacity and stability. Herein, we propose a synergistic approach that combines high-entropy doping and precise composition modulation. A structurally reinforced high-entropy doped LNO material is synthesized via coprecipitation, where atomic-level dispersion of dopants and entropy stabilization effects collaboratively optimize multielement synergy. This design suppresses cation disordering, enhances Li⁺ diffusion kinetics at high rates, strengthens lattice robustness in highly charged states, and ultimately improves the durability of LNO cathode.