Volume 9 Issue 2 ( June 2022 )

The lithium-ion battery is the most advanced battery technology widely available. Lithium rechargeable batteries have recently been used in transportation (for example, electric cars) and energy storage systems that need a lot of energy and power on a large scale. LiNi_0.6Mn_0.2Co_0.2O₂ (NMC622) is a cathode material that has a high energy density. Doping in lithium-ion battery cathode materials has become a topic of interest worldwide. In this study, NMC622 cathode synthesis was conducted with transition metal doping using co-precipitation. The co-precipitation approach was chosen for the material's production (LiNi_0.6Mn_0.2Co_0.2O₂)_1-xM_x (M = Fe, Ti, Zn, Ce, and Cu) because of its ability to produce particles with a high degree of atomic uniformity. Due to the high energy metal oxygen bond dissociation, Fe, Ti, Zn, Ce, and Cu were utilized as doping materials in this work. Oxalic acid was used as a precipitation agent, and ammonia was used as a chelating agent. The doping metal used was precipitated using oxalic acid. NMC622 which has been precipitated into NMC622 precursor and doped metal that has been precipitated is mixed for later solid-state processing. Under the flow of air, the obtained oxalate precursor is heated. The characterization of metal-doped NMC622 was carried out. The x-ray diffraction pattern depicts the hexagonal layered material's structure. FTIR analysis confirmed the missing C-O bonds of the obtained product. SEM (scanning electron microscope) studies show a polyhedral morphology of the material. A charge-discharge test at 1/10 C between 2.6 and 4.3 V was used to achieve the electrochemical performance. Ce doping resulted in the best specific capacity and could be compared with non-doped materials.

Keywords: Battery, Cathode, NMC622, Doping