Facile solvothermal synthesis of NaTi2(PO4)3/C porous plates as electrode materials for high-performance sodium ion batteries

Self-standing NASICON-type electrodes with high mass loading for fast-cycling all-phosphate sodium-ion batteries

“…The straight lines in the low-frequency region in the Nyquist plots were attributed to the diffusion of sodium ions in the bulk of the electrode material, and the value of the diffusion coefficient (D Na +) for sodium ions can be estimated using the equation D Na + ¼ 0.5(RT/An 2 F 2 s w C) 2 , where R is the gas constant, T is the temperature, A is the area of the electrode surface (according to the BET results), n is the number of electrons per species reaction, F is the Faraday constant, s w is the Warburg factor, and C is the molar concentration of Na + ions. 47 The calculated values of the diffusion coefficient for sodium (based on the EIS data obtained aer the formation cycles) for NTP/CNFs and NVP/CNFs were 9.18 Â 10 À11 and 6.25 Â 10 À12 cm 2 s À1 , respectively, which are slightly higher than previously reported values [48][49][50][51] and demonstrate the capacity for fast transport of Na + ions of the prepared electrodes.…”

Challenges and Perspectives for NASICON‐Type Electrode Materials for Advanced Sodium‐Ion Batteries

“…Besides NaTi 2 (PO 4 ) 3 and NaZr 2 (PO 4 ) 3 , there are further NASICON anode materials that are worthy of mention, such as NaV 2 (PO 4 ) 3 , Na 3 V 2 (PO 4 ) 3 , NaSn 2 (PO 4 ) 3 , Na 3 Ti 2 (PO 4 ) 3 , and Na 3 MnTi(PO 4 ) 3 . For instance, NaV 2 (PO 4 ) 3 materials performed well as anode material in non‐aqueous electrolyte . Moreover, Na 3 V 2 (PO 4 ) 3 is demonstrated by Jian et al as anode materials for SIB with deep sodiation processes by the formation of Na 4 V 2 (PO 4 ) 3 and Na 5 V 2 (PO 4 ) 3 at 1.6 V and 0.3 V, respectively, delivering a high reversible capacity of 149 mAh g −1 at 11.7 mA g −1 (0.1 C) and good rate capacities .…”

Novel Solid-State Sodium-Ion Battery with Wide Band Gap NaTi2(PO4)3 Nanocrystal Electrolyte

“…However, when the calcination was performed at 600 °C for 3 h, it obviously becomes porous NTP nanocrystals because the crystal does not shrink and the pore shape changes during high-temperature sintering, which is consistent with the previous study. 28 − 30 This phenomenon could be explained by the diffusion and transfer of pores in the sintering of ceramic particles. 28 Figure 1 g shows the XRD patterns of the NTP nanocrystals prepared at 140 °C for 3 h and annealed at 100 °C and 600 °C for 3 h. All the observed diffraction peaks perfectly match the standard diffraction peaks (JCPDS 33-1296), 22 , 25 − 27 illustrating that the NTP nanocrystals have pure phases without any impurities.…”