Synthesis of Mg-doped LiFe0.5Mn0.5PO4/C cathode materials for Li-ion batteries
LiMnxFe1-xPO4(LMFP)cathode materials offer higher energy density compared to LiFePO4,making them a subject of widespread interest.However,their practical application is hindered by low power density resulting from inferior electron/Li-ion conductivities.In this study,a Mg-doped LiMn0.5Fe0.5PO4 cathode is designed and synthesized.This cathode comprises secondary spherical particles self-assembled from nanoscale primary particles,with each nanoparticle uniformly coated by a carbon layer.The introduction of Mg-ions enhances Li-ion transfer efficiency by increasing the gap of octahedral LiO6.At the same time,the carbon coating layer improves electronic conductivity by establishing a complete conductive network within the secondary particles.Moreover,the hierarchical structure shortens the migration path of Li-ions and prevents nanoparticle aggregation during long cycling processes.Consequently,the LMFP/C-1Mg cathode exhibits a reversible specific discharge capacity of 151.8 and 113 mAh/g at 0.1C and 5C,respectively.After 1000 cycles at 1C,the capacity retention increases from 90.6%to 96.4%compared to unmodified cathodes.
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