Anchored oxygen-retardant phase stabilizing high-voltage Ni-rich cathode materials

Ni-rich LiNixCoyMn1−x−yO2 (x ≥ 0.9) cathode materials (NCMs) have been considered promising for next-generation Li-ion batteries owing to their high-energy density. However, their practical application is hindered by gas evolution and rapid capacity degradation, primarily caused by irreversible oxygen release and structural instability. Herein, a facile one-step anchoring strategy is proposed to overcome this challenge by engineering a precisely tailored dual-architecture LiNi0.9Co0.05Mn0.05O2 (DA-NCM). It enables perovskite-phase La4LiNiO8 coating on the cathode surface, stabilized by inert La2Mo2O9 phase via enhanced La–O bond pinning effect. This dual oxygen-retardant architecture effectively regulates oxygen activity, suppresses structural degradation and interfacial parasitic reactions, achieving robust oxygen encapsulation and structural stabilization. Consequently, DA-NCM cathodes exhibit excellent capacity retention of 95.7% at 4.3 V and 93.6% at 4.5 V after 200 cycles and remarkable stability even at a high temperature (50 ℃) and high voltage (4.5 V). This precision design of dual architecture provides a new pathway for developing high-energy-density cathode materials with long cycle life.