Enhanced electrochemical properties of NASICON-type Na3Zr2Si2PO12 solid electrolytes with Tb3+-ions-assisted sintering

Na3Zr2Si2PO12 Solid Electrolyte Separator for Aqueous Sodium-Ion Batteries: Synthesis via the One-Step Sintering of Glass-Ceramics

“…The Warburg resistance was not observed probably because of its high value (10 MΩ). 23 However, in a previous study, the resistance of the pellet was considered higher (one to two orders of magnitude) than the value reported here because of its smaller area. A semicircular impedance plot similar to the one presented for the NASICON-type Li-ion conductor in Fig.…”

“…The total conductivity, encompassing both the grain and grain-boundary resistances, was compared with those reported in previous studies. [21][22][23] The impedance plots had two shapes: a semicircle with high resistance that passes through the origin from 800 to 950 °C (Fig. 6a) and a semicircle with low resistance that does not pass through the origin from 1000 to 1200 °C (Fig.…”

Ionic Conductivity Analysis of NASICON Solid Electrolyte Coated with Polyvinyl-Based Polymers

“…The markedly high value obtained for the total resistance corresponds, in turn, to an ionic conductivity of 6.03 × 10 −4 mS cm −1 , which is much lower than both the initially reported conductivity of 0.67 mS cm −1 and the value indicated by the manufacturer for this specific NZSP pellet of ≈0.8 mS cm −1 [8,10]. This discrepancy is due to the fact that this conductivity in ideal conditions is obtained by coating the ion-blocking electrodes onto the NZSP pellet directly, using techniques such as sputtering, thus minimizing the electrode/electrolyte interfacial resistance [36,37]. In this study, the focus is on reducing the interfacial resistance of NZSP under practical real-world cell operating conditions, where the effective electrode/electrolyte contact surface area is smaller compared to the electrode deposition case.…”

“…The electrochemical performance baseline was obtained by conducting an EIS test on an Au/NZSP/Au symmetric cell and the subsequent analysis of the resulting Nyquist plot presented in Figure 2a. This plot was then fitted to the corresponding equivalent circuit for this cell configuration, which encompasses a resistor R 1 that accounts for the ohmic resistance of all the components of the cell, followed by a parallel of another resistor, R 2 , and a constant phase element, CPE 1 , that represent the grain-boundary resistance, both in the bulk and at the electrode/electrolyte interface, associated with charge accumulation through the double layer capacitance (EDLC) [35,36]. By adding the values obtained for R 1 and R 2 , the total resistance of the cell, R t = 67.7 kΩ , was calculated.…”

Zirconia-free NaSICON solid electrolyte materials for sodium all-solid-state batteries

“…[8][9][10][11][12] Notably, NaSICONs have been studied as both electrodes [13][14][15][16][17][18][19] and solid electrolytes. [20][21][22][23][24][25][26] NaSICON-type structures, Na 1+x Zr 2 Si x P 3−x O 12 (0 # x # 3), hereaer referred to as NZSP, exhibits superior ionic conductivity, 27,28 with total ionic conductivities approaching ∼5 mS cm −1 . Na 3 Zr 2 Si 2 PO 12 (N3.0ZSP) is widely studied and optimized, via doping or materials processing to improve its ionic conductivity for ASSBs.…”