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The electrochemical properties of Mg-doped LiFe 0.48 Mn 0.48 Mg 0.04 PO 4 and pure LiFe 0.5 Mn 0.5 PO 4 oli-vine cathodes are examined and the lattice parameters are refined by Rietveld analysis. The cal-culated atomic parameters from the refinement show that Mg 2+ doping has a significant effect inthe olivine LiFeMnPO 4 structure. The unit cell volume is 297.053(2) A 3 for pure LiFe 0.5 Mn 0.5 PO 4 and is decreased to 296.177(1) A 3 for Mg-doped LiFe 0.48 Mn 0.48 Mg 0.04 PO 4 sample. The doping ofMg 2+ cation with atomic radius smaller than Mn 2+ and Fe 2+ ion induces longer Li-O bond lengthin LiO 6 octahedra of the olivine structure. The larger interstitial sites in LiO 6 octahedra facilitate thelithium ion migration and also enhance the diffusion kinetics of olivine cathode material. TheLiFe 0.48 Mn 0.48 Mg 0.04 PO 4 sample with larger Li-O bond length delivers higher discharge capacitiesand also notably increases the rate capability of the electrode.Keywords : Lithium ion battery, Olivine structure, LiFe

Structural and Electrochemical Properties of Doped LiFe0.48Mn0.48Mg0.04PO4 as Cathode Material for Lithium ion Batteries