Under the most Li-poor (oxidizing) conditions (Figure ), E Fermi,eq further decreases to 1.45 eV. The dominant defects are the same as those under the moderate conditions, i.e., Li +1 i and V - 1 Li , and show slightly di↵erent E D,q all below 1 eV. Note that the neutral defect V 0 Li , not plotted at E Fermi, eq because it is less favorable than its charged analogue (V - 1 Li on the same Wycko↵ site, also shows very low E D,q below 1 eV. All the dominant defects mediating Li di↵usion make up a total concentration of 4.34 ⇥ 10 11 cm 3 . The net free electron concentration is about 1.96 ⇥ 10 7 cm 3 .