We also perform additional DFT calculations to evaluate how the degree of oxygen/fluorine ordering in ReO 3type TiOF 2 affects its lithium-intercalation properties. We find that increasing anion disorder makes lithium intercalation more favourable by, on average, up to 2 eV. This result suggests that the electrochemical properties of ReO 3 -type TiOF 2 , and potentially other heteroanionic intercalation electrode materials, can be controlled through synthesis protocols designed to produce samples with specific degrees of short-range anion order.