Li ] resulting from a nominal dopant concentration of 0.25 per formula unit and the assumption that all added dopants will be incorporated into the structure. The solid lines show [V Li ] resulting from equilibrium dopant concentrations. Regardless of the synthesis technique, dopants incorporated into the structure require charge compensation and will stabilise additional defects. Therefore, a dopant's "success" is highly dependent on both the quantity of dopant incorporated into the structure during sintering as well as the temperature at which its defects freezes-in. At what temperature the different dopants freezes-in is highly complex and has not been investigated in our work.