i , and Li +1 O with defect formation energies ( E D,q ) of 0.43 eV, 1.03 eV, 1.39 eV, and 1.86 eV, respectively. When the temperature is raised to 500 K, E D,q for a q = +1 (q = 1) defect decreases (increases) by 6 meV, in line with the change in E Fermi, eq . In 300-500 K temperature range, the range of defect concentrations