Electrochemical characteristics of LiNi0.9Co0.1O2 synthesized at 800 °C from the different combinations of carbonates and oxides

Cathode active materials with a composition of LiNi0.9Co0.1O2 were synthesized by a solid-state reaction method at 800 °C using Li2CO3, NiO or NiCO3, and CoCO3 or Co3O4 as the sources of Li, Ni, and Co, respectively. The electrochemical properties of the synthesized samples were then investigated. The structure of the synthesized LiNi0.9Co0.1O2 was analyzed, and the microstructures of the samples were observed. The curves of voltage vs. x in LixNi0.9Co0.1O2 for the first charge-discharge and the intercalated and deintercalated Li quantity Δx were studied. The LiNi0.9Co0.1O2 sample synthesized from Li2CO3, NiCO3, and Co3O4 had the largest first discharge capacity (152 mAh/g), with a discharge capacity deterioration rate of 1.4 mAh/g/cycle.