Thermal Stability of NASICON-Type Na3V2(PO4)3 and Na4VMn(PO4)3 as Cathode Materials for Sodium-ion Batteries

The thermal stability of NASICON-type cathode materials for sodium-ion batteries was studied using differential scanning calorimetry (DSC) and in situ high-temperature powder X-ray diffraction (HTPXRD) applied to the electrodes a pristine or charged state. Na3V2(PO4)3 Na4VMn(PO4)3 were analyzed their peak temperatures exothermic effect values decomposition processes, as well phase transformations that took place upon heating. obtained results indicate Mn-substituted material demonstrates much poorer state, although samples both exhibit similar behavior without any DSC peaks temperature-induced transitions temperature range. HTPXRD revealed amorphization desodiated Na4VMn(PO4)3-based occurring at 150~250 °C.