Additive effect of fluoroethylene and difluoroethylene carbonates for the solid electrolyte interphase film formation in sodium-ion batteries: a quantum chemical study

To reveal the FEC–DFEC mystery, the reduction decomposition mechanism study of Na ⁺ –PC, Na ⁺ –FEC and Na ⁺ –DFEC complexes is carried out by using DFT. This study concludes that the higher activation barrier and absence of NaF complexes make DFEC futile.