Studies of Functional Defects for Fast Na-Ion Conduction in Na 3-yPS4-xClx with a Combined Experimental and Computational Approach
- Florida State Univ., Tallahassee, FL (United States). Dept. of Chemistry and Biochemistry
- Univ. of California, San Diego, CA (United States). Dept. of NanoEngineering
- Florida State Univ., Tallahassee, FL (United States). Dept. of Chemistry and Biochemistry; National High Magnetic Field Lab., Tallahassee, FL (United States). Center for Interdisciplinary Magnetic Resonance
Abstract All‐solid‐state rechargeable sodium (Na)‐ion batteries are promising for inexpensive and high‐energy‐density large‐scale energy storage. In this contribution, new Na solid electrolytes, Na 3− y PS 4− x Cl x , are synthesized with a strategic approach, which allows maximum substitution of Cl for S ( x = 0.2) without significant compromise of structural integrity or Na deficiency. A maximum conductivity of 1.96 mS cm −1 at 25 °C is achieved for Na 3.0 PS 3.8 Cl 0.2 , which is two orders of magnitude higher compared with that of tetragonal Na 3 PS 4 (t‐Na 3 PS 4 ). The activation energy ( E a ) is determined to be 0.19 eV. Ab initio molecular dynamics simulations shed light on the merit of maximizing Cl‐doping while maintaining low Na deficiency in enhanced Na‐ion conduction. Solid‐state nuclear magnetic resonance (NMR) characterizations confirm the successful substitution of Cl for S and the resulting change of P oxidation state from 5+ to 4+, which is also verified by spin moment analysis. Ion transport pathways are determined with a tracer‐exchange NMR method. The functional detects that promote Na ‐ion transport are maximized for further improvement in ionic conductivity. Full‐cell performance is demonstrated using Na/Na 3.0 PS 3.8 Cl 0.2 /Na 3 V 2 (PO 4 ) 3 with a reversible capacity of ≈100 mAh g ‐1 at room temperature.
- 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), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0012118
- OSTI ID:
- 1542272
- Alternate ID(s):
- OSTI ID: 1491266
- Journal Information:
- Advanced Functional Materials, Vol. 29, Issue 9; ISSN 1616-301X
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Enhanced sodium ion conductivity in Na 3 VS 4 by P-doping
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journal | January 2019 |
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