Direct Repair of the Crystal Structure and Coating Surface of Spent LiFePO4 Materials Enables Superfast Li-Ion Migration

Simultaneously repairing the degraded crystal structure and reconstructing the damaged carbon coating in spent LiFePO 4 cathode enables superfast lithium-ion diffusion kinetics and produces a stable cathode–electrolyte interface. The regenerated LiFePO 4 cathode delivers remarkable rate capability, low-temperature performance and compatibility in solid-state batteries. The proposed direct regeneration approach has high economic and environmental benefits compared to hydrometallurgical and conventional direct recycling methods.