Thermal, structural, morphological, functional group and first cycle charge/discharge study of Co substituted LiNi_1?x-0.02Mg_0.02Co_xO₂ (x = 0.00, 0.02, 0.04, 0.06, and 0.08) cathode material for LIBs

LiNi 1?x-0.02 Mg 0.02 Co x O 2 compounds with = 0.0, 0.02, 0.04, 0.06, and 0.08 compositions are prepared by the solid-state method. Their thermal, structural, morphological, functional, first cycle charge/discharge studies were carried out help of thermogravimetric analysis (TGA)/differential thermal (DTA), XRD, SEM, FTIR, a biologic galvanostat respectively. The TGA/DTA shows their structural stability up to 800 °C. ?-NaFeO layered hexagonal-rhombohedral structure lattice parameters 2.868 Å c 14.217 space group [Formula: see text] was found XRD pattern. intensity ratio is close 1.2 or more, which indicates that there no cation-mixing. factor (R) less than 0.5, indicating stability. particles fine homogeneously distributed capacity cyclability charge/discharge. grain size be 3.19, 2.78, 4.83, 4.13, 5.09 µm for 0.08, frequency stretching bending increased doping changed covalency M–O bond. sample cobalt concentration most efficient one (?90% retention 176.61/174.17 mA h g ?1 capacity) among five. Hence, substitution an appropriate amount in combination magnesium, cheaper element, still more exotic cathode material Ni-rich lithium-ion batteries.