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Anion and cation co-doping of Na4SnS4 as sodium superionic conductors

Journal Article · · Materials Today Physics
 [1];  [1];  [1];  [1];  [2];  [3];  [1]
  1. Georgia Institute of Technology, Atlanta, GA (United States)
  2. Argonne National Lab. (ANL), Lemont, IL (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Na based all-solid-state batteries are one of the most promising candidates for large-scale electrochemical energy storage owing to their low cost and outstanding safety properties. The key enabler of this technology is solid electrolyte with sufficiently high ionic conductivity at room temperature. In this work, the design, synthesis, characterization and testing of a series of novel fast Na-ion conductors, Na4-x-ySn1-xAxS4-yXy with aliovalent cation (P5+/Sb5+) and anion substitutions (Cl-/Br-) of the parent compound Na4SnS4 are reported. The doped samples crystalize in a new phase with space group I41/acd and show ionic conductivities that are one to four orders of magnitude higher than that of undoped Na4SnS4. R. t. conductivity of 0.64 mS cm-1 is achieved in Na3.7Sn0.8Sb0.2S3.9Cl0.1 with a low activation energy of 0.26 eV. Furthermore, Rietveld refinement against high resolution synchrotron X-ray powder diffraction data reveals that the distribution of the doping ions and the resulted Na vacancies are underlying cause of the enhanced conductivity.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
Georgia Institute of Technology; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357; SC0012704
OSTI ID:
1763332
Alternate ID(s):
OSTI ID: 1775100
Report Number(s):
BNL--220923-2021-JAAM
Journal Information:
Materials Today Physics, Journal Name: Materials Today Physics Vol. 15; ISSN 2542-5293
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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