The synthesis-defect chemistry-property relationship of several complex oxide battery cathode materials have been investigated by theoretical studies. One key term for calculating the defect formation energies is the atomic chemical potential, which can be considered as the available atomic species responsible for generating the defects. The ranges of atomic chemical potentials where the target compound is stable reflect the ranges of possible growth environments for the material to be synthesized experimentally. A large atomic chemical potential stability field corresponds to a wider range of growth environments for the host. The defect formation energies, therefore, can vary over a larger range. Since defect concentrations scale exponentially with the defect formation energies, the predicted concentrations can be orders of magnitude different. To correctly calculate the atomic chemical potentials term, it is essential to consider all the stable phases in the corresponding phase diagrams. Hoang and Johannes presented a detailed DFT study on the intrinsic point defects for the layered