fig10

Figure 10. The effect of FEC on SIB cathodes. (A) Interfacial degradation mechanism of the NaFeO₂ cathode, Reproduced from ref^[20], copyright 2022 IOP Publishing; (B) Na 1s XPS profiles of P2-Na_xCo_0.7Mn_0.3O₂ cathodes after 20 cycles in electrolyte with and without FEC, Reproduced from ref^[129], Copyright 2019 Acta Physico-Chimica Sinica publication; (C) TEM images of Na_2/3Ni_1/3Mn_2/3O₂ cathodes cycled in FEC electrolytes and PC electrolytes characterizing the CEI layer, Reproduced from ref^[130], copyright 2021 Wiley. CEI: Cathode electrolyte interphase; FEC: fluoroethylene carbonate; PC: propylene carbonate; SEI: solid electrolyte interphase; SIB: sodium-ion battery; TEM: transmission electron microscopy; XPS: X-ray photoelectron spectroscopy.