Origin of Outstanding Phase and Moisture Stability in a Na3P1–x AsxS4 Superionic Conductor
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Materials Science and Engineering
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Mechanical and Nuclear Engineering
- 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
Web of Science
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 |
Similar Records
Solid electrolyte for solid-state batteries: Have lithium-ion batteries reached their technical limit?
Evidence for a Solid-Electrolyte Inductive Effect in the Superionic Conductor Li10Ge1–xSnxP2S12