Al Doped into Si/P Sites of Na₃Zr₂Si₂PO₁₂ with Conducted Na₃PO₄ Impurities for Enhanced Ionic Conductivity

Stabilized Solid–Solid Interface for Solid-State Sodium Batteries Using Gradient Ion-Electron Conductive Phases Modified Sodium Metal Anode

“…Driven by the emerging need for large-scale energy storage, Na-ion batteries are considered the ideal battery system to replace the existing Li-ion batteries with their abundant reserves and low prices. − However, traditional Na-ion batteries using organic electrolytes present safety issues, and conventional hard carbon anodes cannot meet high energy density requirements. , High-performance solid-state sodium–metal batteries (SSSMBs) with solid-state electrolytes (SSEs) are considered the ideal new-generation Na-ion batteries because they can apply high-energy-density Na-metal anodes and high-voltage cathodes. Among various types of SSEs, including polymers, , sulfides, , halides, and oxides, − etc., the sodium superionic conductor oxide SSEs , (usually indicated as NZSP, Na 1+ x Zr 2 Si x P 3– x O 12 ) have gained extensive prominence owing to their high ionic conductivity, wide electrochemical window, and good chemical compatibility with Na metal. Although the NZSP-based SSSMBs boast impressive advantages, the issues of poor solid–solid contact between sodium metal and NZSP, inhomogeneous sodium deposition, − and slow migration of bulk-phase sodium , still hinder the practical application of SSSMBs.…”