far off the values present in experiment (∼ 10 -6 -10 -2 S cm -1 ). Figure displays the ionic conductivity as a function of µ O calculated with the same strategy using our defect model for undoped and H-doped Li 3 OCl. Our results align well with Squires et al. where low conductivities of ∼ 10 -10 S cm -1 are observed. Upon incorporation of hydrogen, the V Li conductivity increases from ∼ 3.75 × 10 -11 S cm -1 under Li-poor conditions to ∼ 3.35 × 10 -10 S cm -1 under Li-rich conditions. By including the "pseudo-V Li " into our model, before considering potential enhancements to the mobility due to OH rotations the ionic conductivity of H-doped Li Included is also the "pseudo" v Li whereby H Li is treated as a v Li using the same migration barrier. A range of literature values is given, taken from reference [28].