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

Read the full article See related articles

Listed in

This article is not in any list yet, why not save it to one of your lists.
Log in to save this article

Abstract

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.

Article activity feed