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Title: A stable cathode-solid electrolyte composite for high-voltage, long-cycle-life solid-state sodium-ion batteries

Journal Article · · Nature Communications
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  1. Univ. of California San Diego, La Jolla, CA (United States)
  2. Univ. of California, Santa Barbara, CA (United States)
  3. Stony Brook Univ., NY (United States)
  4. Shell International Exploration & Production Inc., Houston, TX (United States)
  5. Shell Global Solutions International BV, The Hague (Netherlands)
  6. Univ. of California San Diego, La Jolla, CA (United States); TCG Centres for Research and Education in Science and Technology (TCG CREST), Kolkata (India)

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 emperature 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.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Science Foundation (NSF)
Grant/Contract Number:
SC0012704; ECCS-1542148
OSTI ID:
1783756
Report Number(s):
BNL-221438-2021-JACI
Journal Information:
Nature Communications, Vol. 12, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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