Electrochemical characteristics of LiNi0.7Co0.3O2 synthesized from different combinations of hydro-oxides, carbonates, and oxides at 800 °C

Cathode active materials with a composition of LiNi0.7Co0.3O2 were synthesized by solid-state reaction at 800 °C using Li2CO3 or LiOH·H2O, NiO or NiCO3, and CoCO3 or Co3O4 as sources of Li, Ni, and Co, respectively. The electrochemical properties of the synthesized samples were then investigated. The structures of the synthesized LiNi0.7Co0.3O2 samples were analyzed, and the microstructures of the samples were observed. The curves of voltage vs. x in LixNi0.7Co0.3O2 for the first charge-discharge and the intercalated and deintercalated Li quantity Δx were studied. The LiNi0.7Co0.3O2 sample synthesized from LiOH·H2O, NiO, and Co3O4 had the largest first discharge capacity of 162 mAh/g with a discharge capacity deterioration rate of 9.1 mAh/g/cycle.