Stable Electrochemical Lithium Extraction Using LiMn2O4 Coated With Lithiated Nafion

Abstract Electrochemical lithium extraction from salt lakes using LiMn 2 O 4 (LMO) presents an eco‐friendly, highly controllable, and efficient method. However, its practical application is limited due to its structure instability and manganese dissolution in water. Herein, a high‐performance LMO coated with ≈3.5 nm thickness lithiated Nafion (Li‐Nafion) for electrochemical lithium extraction is reported. The Li‐Nafion coating constructs a fast lithium‐ion transport pathway and enhances the hydrophilicity of the LMO particles, promoting charge transfer and improving rate capability. Thereby, an enhanced lithium extraction capacity of 4 mmol g −1 is achieved. Importantly, the coating significantly inhibits Mn loss in LMO, resulting in significantly improved cyclic stability, with a capacity retention rate of 96% after 50 cycles. Furthermore, the Li‐Nafion modified LMO effectively extracts lithium electrochemically in Zabuye salt lake, showcasing practical potential.