Advances in Ion Doping Strategies for LiMnxFe1-xPO4 Cathodes: Progress, Challenges, and Outlook

LiMn_xFe_1-xPO₄ possesses notable advantages including high energy density, excellent safety performance, scalability for large-scale production, and low cost. Thus emerging as one of the most promising olivine-structured cathode materials. However, key technical hurdles still hinder its large-scale application, such as intrinsically low electrical conductivity and compromised cycling stability induced by the Jahn-Teller effect. Accordingly, this paper commences with an overview of the structural characteristics and underlying reaction mechanisms of lithium iron manganese phosphate LiMn_xFe_1-xPO₄, examines the merits and limitations of Mn/Fe ratio optimization on its electrochemical performance, and provides a comprehensive reviews the of doping modification strategies targeting distinct lattice sites of this material. Finally, the critical issues, new research directions, and perspectives on further commercialization of LiMn_xFe_1-xPO₄ are discussed.