We provide a survey of the defect chemistry by calculating the defect concentrations around the perimeter of the chemical potential stability region in fig. . Surveying these extrema allows us to identify the maximum possible concentrations of defects that will leave undercoordinated oxygen in the structure at top of charge in delithiated LiNiO 2 . Under most conditions the dominant defects are the electron polaron η -, Ni Li antisite defect, the hole polaron η + and the ] antisite. The relatively low formation energy of the electron and hole polarons is a reflection of the charge-disproportionated nature of "pristine" LiNiO 2 .