Corrigendum: CTAB-Assisted Synthesis of C@Na3V2(PO4)2F3 With Optimized Morphology for Application as Cathode Material for Na-Ion Batteries - Criado, Ana; Lavela, Pedro; Ortiz, Gregorio F.; Tirado, José L.; Gzouli, Somaya; Edfouf, Zineb; Pérez-Vicente, Carlos (Frontiers in Physics, 2021)