Abstract
The present study investigates on the effect of excessive Ni doping, secondary heat-treatment and their influence on the structural and electrochemical properties of LiMn1.3Ni0.7Oy spinel samples prepared by a two-step solid state synthesis. X-ray diffraction (XRD), Fourier transform infra-red spectroscopy (FTIR), scanning electron microscopy (SEM), electrochemical studies and in-situ synchrotron XRD (SXRD) results acquired during electrochemical lithiation indicates that the concentration of Mn3+ and the corresponding ordering of the spinel composition can be controlled by excessive nickel doping and secondary annealing (at 700°C). Moreover, the above characterizations also confirmed long-range cation ordering (P4332) in addition to minor contributions from the Mn3+ content in the secondary annealed spinel (LiMn1.3Ni0.7Oy). More importantly, the combined effect of extended Ni-doping and secondary heat-treatment is clearly reflected as an enhancement in the rate performances of LiMn1.3Ni0.7Oy spinel cathode at elevated current rates (discharge capacity of around 88 and 61 mAh/g at 0.457 and 0.914 A/g current densities).
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