Reviving Fatigue Surface for Solid‐State Upcycling of Highly Degraded Polycrystalline LiNi1‐x‐yCoxMnyO2 Cathodes

The ongoing tide of spent lithium-ion batteries (LIBs) urgently calls for high-value output in efficient recycling. Recently, direct regeneration has emerged as a novel recycling strategy but fails to repair the irreversible morphology and structure damage of the highly degraded polycrystalline layered oxide materials. Here, this work carries out a solid-state upcycling study for the severely cracked LiNi