Cathode materials are vital for lithium-ion batteries(LIBs)because they determine their performance by directly affecting the energy density,cycle life,rate,and safety of these batteries.Olivine-type LiMnFePO4 is a commercial LIB cathode material with good market prospects due to its high energy density,low cost,environmental compatibility,stability,and safety.However,the inherent shortcomings of LiMnFePO4,such as low electronic and ionic conductivity,seriously hinder its large-scale commercial application in high-performance LIBs.Thus,improving the electron and ion conductivity of LiMnFePO4 is an urgent problem to solve.This review comprehensively discusses the structural characteristics,synthesis methods,and the recent research progress in LiMnFePO4 cathode materials.Improving the conductivity of LiMnFePO4 cathode materials by surface coating,morphology control,and ion doping is discussed.Although these three modification methods can optimize the electron and ion transport path in the LiMnFePO4 matrix,the problem of poor electronic and ionic conductivity is difficult to solve via a single method.To improve the comprehensive performance of LiMnFePO4 cathode materials,this paper summarizes the current research progress and proposes future research directions for LiMnFePO4.The modification strategy of combining carbon-doped heteroatom coating,control of the short b-axis morphology,and ion doping is considered an effective remedy for the poor electronic and ionic conductivity and can endow LiMnFePO4 cathode materials with high capacity and high stability.
关键词
磷酸锰铁锂/导电性能/表面包覆/形貌控制/离子掺杂
Key words
lithium manganese iron phosphate/conductivity/surface coating/morphology control/ion doping
维普
万方数据