These findings highlight the immense potential of halides for SSSB applications.Ī solid-state architecture for rechargeable sodium-ion batteries has garnered substantial research interest in recent years 1, 2, 3, 4, 5. A SSSB comprising a NaCrO 2 + NYZC composite cathode, Na 3PS 4 electrolyte, and Na-Sn anode exhibits an exceptional first-cycle Coulombic efficiency of 97.1% at room temperature and can cycle over 1000 cycles with 89.3% capacity retention at 40 ☌. ![]() Its high ionic conductivity of 6.6 × 10 −5 S cm −1 at ambient temperature, several orders of magnitude higher than oxide coatings, is attributed to abundant Na vacancies and cooperative MCl 6 rotation, resulting in an extremely low interfacial impedance. ![]() Na/Na +) and chemically compatible with oxide cathodes. ![]() Here, we report the discovery of the ion conductor Na 3-xY 1-xZr xCl 6 (NYZC) that is both electrochemically stable (up to 3.8 V vs. ![]() However, the poor electrochemical stability between current sulfide-based solid electrolytes and high-voltage oxide cathodes has limited their long-term cycling performance and practicality. Rechargeable solid-state sodium-ion batteries (SSSBs) hold great promise for safer and more energy-dense energy storage.
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