Effect of Mn and Ni Doping and Co-Doping into Lifepo4/C Cathodes of Li Ion Batteries

Mn and Ni doped and co-doped LiFePO4/C composites were synthesized through solid state reaction. The structural and morphological characterization of the as-synthesized samples were done using X-ray diffraction, Fourier Transform Infrared Spectroscopy, X-ray Absorption spectroscopy and scanning electron microscopy measurements. Electrochemical performance of the Mn and Ni doped and co-doped LiFePO4/C composite electrodes were evaluated through cycle stability test, rate capability test, cyclic voltammetry measurements and electrochemical impedance spectroscopy measurements. Theoretical insight into the effect of Mn and Ni doping and co-doping into olivine LiFePO4 structure have been obtained through Density Functional Theory calculations. Co-doping of LiFePO4 electrodes of Li ion batteries by transition metals has not been investigated both theoretically and experimentally earlier in the literature.