Niobium based anodes are gaining increasing popularity for application in high-power lithium-ion batteries, due to their high theoretical capacities, inherent safety at high current densities, and long-term stability. Here, we report the discovery and characterisation of a new Wadsley Roth niobate system, Nb₇Ti_1.5Mo_1.5O₂₅, showing that it is isostructural with known systems: Nb₉PO₂₅ and Nb₉VO₂₅.