A novel phase of superionic conductor β′-Na₃PS₄ with a large band gap and a low migration barrier

Abstract

Na3PS4 crystals with high ionic conductivity are promising solid-state electrolytes. Here, a novel phase of Na3PS4 (β'-NPS) crystalizing in a cubic lattice with a space group of P4 ̅3m was...

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

“…4,5 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, 6,7 sulfides, 8,9 halides, 10 and oxides, 11−15 etc., the sodium superionic conductor oxide SSEs 16,17 (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, 18−21 and slow migration of bulk-phase sodium 22,23 still hinder the practical application of SSSMBs.…”

“…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.…”