Corrigendum to "Generalised single particle models for high-rate operation of graded lithium-ion electrodes: Systematic derivation and validation" [Electrochimica Acta 339 (2020) 135862]. - Timms, R.; Marquis, S.G.; Korotkin, I.; Sulzer, V.; Richardson, G.; Ranom, R.; Castle, M.; Foster, J.M.; Please, C.P.; Chapman, S.J. (Electrochimica Acta, 2020)