Effect of calcining temperature on the structure and electrochemical performance of Li[Mn_1/3Ni_1/3Co_1/3]O₂

Li[Mn_1/3Ni_1/3Co_1/3]O₂ powder was prepared by carbonate co-precipitation method. The effects of precusor calcining temperature on the structure and electrochemical oxide compounds were studied under different annealing temperature. X-ray diffraction(XRD) revealed that the layered Li[Mn_1/3Ni_1/3Co_1/3]O₂ can be synthesized at lower temperature of 800°C with low cation mixing. SEM observations showed that the synthesized materials have spherical secondary particles of about 5 μm, made up of small nano-sized particles (200 nm). In the voltage range of 2.8-4.3 V, the maximum discharge specific capacity and the minimum capacity loss were obtained for the material synthesized at 800°C, which has the initial discharge capacity of 159. 06 mAh·g^-1, and 95. 7% of the initial capacity was retained after 50 charge-discharge cycling. Electrochemical impedance spectroscopy analysis indicated that the material synthesized at 800°C have higher electrochemical activity.