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- Title
A stable cathode-solid electrolyte composite for high-voltage, long-cycle-life solid-state sodium-ion batteries.
- Authors
Wu, Erik A.; Banerjee, Swastika; Tang, Hanmei; Richardson, Peter M.; Doux, Jean-Marie; Qi, Ji; Zhu, Zhuoying; Grenier, Antonin; Li, Yixuan; Zhao, Enyue; Deysher, Grayson; Sebti, Elias; Nguyen, Han; Stephens, Ryan; Verbist, Guy; Chapman, Karena W.; Clément, Raphaële J.; Banerjee, Abhik; Meng, Ying Shirley; Ong, Shyue Ping
- Abstract
Rechargeable solid-state sodium-ion batteries (SSSBs) hold great promise for safer and more energy-dense energy storage. 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. Here, we report the discovery of the ion conductor Na3-xY1-xZrxCl6 (NYZC) that is both electrochemically stable (up to 3.8 V vs. Na/Na+) and chemically compatible with oxide cathodes. 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 MCl6 rotation, resulting in an extremely low interfacial impedance. A SSSB comprising a NaCrO2 + NYZC composite cathode, Na3PS4 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 °C. These findings highlight the immense potential of halides for SSSB applications. Rechargeable solid-state sodium-ion batteries hold great promise for safer and more energy-dense energy storage. Here, the authors show a new sodium-based halide, Na3-xY1-xZrxCl6, for sodium-all-solid-state batteries with enhanced ionic conductivity and long-term cycling stability.
- Subjects
SOLID electrolytes; ELECTROLYTES; ENERGY storage; IONIC conductivity; OXIDE coating; MAGNITUDE (Mathematics); STORAGE batteries
- Publication
Nature Communications, 2021, Vol 12, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-021-21488-7