Interfacial anchoring of manganese boosting cycle stability of LiMn0.6Fe0.4PO4 cathode for lithium-ion battery

Lithium manganese iron phosphate (LMFP) has been considered as a highly promising cathode for next-generation lithium-ion batteries due to its high operating potential and energy density. However, the continuous Mn dissolution during cycling caused capacity fading and voltage decay, severely limiting the practical application. To address this issue, the interfacial anchoring strategy based on the construction of C S Mn bond between LMFP and carbon coating layer has been proposed to suppress Mn dissolution during cycling. It has been demonstrated that the formation of C S Mn bond can enhance the structural stability during cycling and suppress the interfacial side reactions caused by Mn migration. Moreover, the introduction of C S Mn bond can facilitate charge transportation and improve ion diffusion kinetics. Benefiting from these effects, LMFP@C/S exhibited excellent cycling stability (75.2% retention over 1500 cycles at 5C) and outstanding rate performance (110.1 mAh g −1 at 5C). When assembled into pouch cells with a commercial graphite anode, LMFP@C/S can maintain a capacity retention of 80.1% after 160 cycles at 0.5C, demonstrating high practicality of the LMFP@C/S cathode. This study provides a simple and effective strategy to enhance the electrochemical performance of LMFP cathodes, offering new insights into the interfacial chemical regulation of Mn-based cathode.