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Title: Origin of Outstanding Phase and Moisture Stability in a Na3P1–x AsxS4 Superionic Conductor

Journal Article · · ACS Applied Materials and Interfaces
ORCiD logo [1];  [2]; ORCiD logo [1]; ORCiD logo [3];  [1]
  1. Pennsylvania State Univ., University Park, PA (United States). Dept. of Materials Science and Engineering
  2. Pennsylvania State Univ., University Park, PA (United States). Dept. of Mechanical and Nuclear Engineering
  3. Pennsylvania State Univ., University Park, PA (United States). Dept. of Mechanical and Nuclear Engineering

Sodium ion (Na) solid-state electrolytes (SSEs) are critical to address notorious safety issues associated with liquid electrolytes used in the current Na ion batteries. Fulfilling multiple innovations is a grand challenge but is imperative for advanced Na ion SSEs, such as a combination of high ionic conductivity and excellent chemical stability. Here, our first-principles and phonon calculations reveal that Na3P1–xAsxS4 (0 ≤ x ≤ 1) is a solid-state superionic conductor stabilized at 0 K by zero-point vibrational energy and at finite temperatures by vibrational and configurational entropies. Especially, our integrated first-principles and experimental approach indicates that Na3P1–xAsxS4 is dry-air stable. Additionally, the alloying element arsenic greatly enhances the moisture (i.e., H2O) stability of Na3P1–xAsxS4 by shifting the reaction products from the easy-forming oxysulfides (such as Na3POS3 and Na3PO2S2 with H2S release) to the difficult-forming hydrates (such as Na3P1–xAsxS4·$$n$$H2O with n = 8 and/or 9) due mainly to a weaker As–O affinity compared to that of P–O. The present work demonstrates that alloying is able to achieve multiple innovations for solid-state electrolytes, such as a desirable superionic conductor with not only a high ionic conductivity (for example, 1.46 mS/cm at room temperature achieved in Na3P0.62As0.38S4) but also an excellent chemical stability with respect to temperature, composition, and moisture.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1484768
Journal Information:
ACS Applied Materials and Interfaces, Vol. 9, Issue 19; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 40 works
Citation information provided by
Web of Science

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Cited By (4)

Sulfide Solid Electrolytes for Lithium Battery Applications journal August 2018
Electrolytes and Interphases in Sodium‐Based Rechargeable Batteries: Recent Advances and Perspectives journal April 2020
Electrolytes and Interphases in Sodium-Based Rechargeable Batteries : Recent Advances and Perspectives text January 2020
Electrolytes and Interphases in Sodium-Based Rechargeable Batteries: Recent Advances and Perspectives text January 2020

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