NASICON‐Type Na₃Zr₂Si₂PO₁₂ Solid‐State Electrolytes for Sodium Batteries**

Abstract

Owing to their low cost, high energy density, and reliable safety, all-solid-state sodium batteries have been regarded as one of the most promising candidates beyond lithium-ion batteries. Sodium super ionic conductor (NASICON)-structured solid-state electrolytes (SSEs), with good electrochemical stability and environmental friendliness, are potential candidates for SSEs. In this Minireview, we summarize the basic properties of Na 3 Zr 2 Si 2 PO 12 SSEs, including structural characteristics, preparation methods, ionic conductivity, and the strategies, substituting proper elements, optimizing preparation approaches, increasing packing density, and so forth, to improve the bulk and grain boundary conductivity. Additionally, we also analyze the challenges and approaches for interfacial modification between electrodes and SSEs in all-solid-state sodium batteries. Finally, future research directions for facilitating the development of allsolid-state sodium batteries are proposed.

High Sodium Ion Mobility of PEO‐NaTFSI‐Na3Zr2Si2PO12 Composite Solid Electrolyte for All‐Solid‐State Na‐S Battery

“…NZSP is also unique compared to other fillers in its sodium ion conduction abilities, so that it can provide new paths for the movement of sodium ions when introduced into the polymer, thus improving the ionic conductivity [32,33] . However, NZSP has high interfacial impedance [17,34,35] . The addition of excess NZSP will reduce the ionic conductivity of the electrolyte membrane.…”

“…[32,33] However, NZSP has high interfacial impedance. [17,34,35] The addition of excess NZSP will reduce the ionic conductivity of the electrolyte membrane. According to these results, it can be determined that the optimal composition of the PEO-NaTFSI-NZSP electrolyte is that ChemistrySelect the ratio of EO to Na + is 20 and the amount of NZSP is 30 wt%.…”

“…are widely studied for their enhanced capacity exertion of active materials through uniform contact of both electrodes. [17][18][19][20] However, their low ionic conductivity is the primary barrier to meeting good battery operation, especially under high rate conditions.…”

Identifying Migration Channels and Bottlenecks in Monoclinic NASICON‐Type Solid Electrolytes with Hierarchical Ion‐Transport Algorithms

“…[33] Thus, solid state Na-ion batteries with Na 3 Zr 2 Si 2 PO 12 electrolyte are demonstrated to be an inexpensive, safe, and reliable option for battery systems. [35] The 3D framework of Na 3 Zr 2 Si 2 PO 12 consists of PO 4 and SiO 4 tetrahedra and ZrO 6 octahedra. Each ZrO 6 octahedron shares its corners with six PO 4 or SiO 4 tetrahedra while each PO 4 or SiO 4 tetrahedron is connected to four ZrO 6 octahedra.…”

Influence of AlPO4 Impurity on the Electrochemical Properties of NASICON‐Type Li1.5Al0.5Ti1.5(PO4)3 Solid Electrolyte

“…In the recent years, a wide range of new solid electrolytes based on polymer, [4] ceramic, [5] or hybrid polymer–ceramic [6] materials have been proposed in the literature. Among ceramic electrolytes, NASICON structured phosphate [7,8] based electrolytes Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 (LAGP) [9,10] and Li 1.5 Al 0.5 Ti 1.5 (PO 4 ) 3 (LATP) [11] have garnered much attention. Their high ionic conductivity (around 10 −4 S cm −1 ), [12] high voltage stability (up to 5 V) and water stability [13] make them versatile enough for innovative battery chemistries such as Li‐O 2 , [14] Li−S [15] and all solid‐state batteries (ASSBs).…”