Electrochemical performances of dual metal substituted nano LiCe(x-y)La(y)Ni1-xO2 cathode materials for rechargeable Li-ion batteries.

: Pristine and Cerium, Lanthanum substituted LiCe(x-y)La(y)Ni1-xO2 (x = 0.20; y = 0.05, 0.10 and 0.15) nanoparticles were synthesized by sol-gel technique using aqueous solutions of metal nitrates and tartaric acid as a chelating agent at 600 degrees C for 10 hours. The structure and Electrochemical properties of the synthesized materials were characterized by using XRD, SEM, EDAX, TEM, Cyclic voltammetry, Charge discharge and Electrochemical Impedance spectroscopy. X-ray powder diffraction analysis was showed an increase in lattice parameters with increasing Lanthanum and Cerium content, which occupies within the layer. The defined layer structure and the lattice parameters were linearly increased with increasing dual substituting contents in LiCe(x-y)La(y)Ni1-xO2. SEM analyses shows that, LiCe0.10La0.10Ni0.80O2 has smaller particle size and more regular morphological structure with narrow size distribution than those of LiNiO2. Cyclic voltammetry results suggests that, LiCe0.10La0.10Ni0.80O2 has lower electrode polarization and high lithium ion diffusivity in solid state body of sample, implying that the substitution is beneficial to the reversible intercalation/deintercalation of Li+ ions. The variations of Ce, La mixing and hexagonal ordering with the higher elements amounts of (increase in R-factor) have favoured the first charge/discharge capacity. The LiCe0.10La0.10Ni0.80O2 cathode materials may find promising applications in lithium ion batteries and electrochemical cells due to the excellent electrochemical performances.