Heavily Tungsten-Doped Sodium Thioantimonate Solid-State Electrolytes with Exceptionally Low Activation Energy for Ionic Diffusion.

Autor: Feng X; Materials Science and Engineering Program & Texas Materials Institute (TMI), The University of Texas at Austin, Austin, TX, 78712-1591, USA., Fang H; Department of Physics, Virginia Commonwealth University, Richmond, VA, 23284, USA., Liu P; Materials Science and Engineering Program & Texas Materials Institute (TMI), The University of Texas at Austin, Austin, TX, 78712-1591, USA., Wu N; Materials Science and Engineering Program & Texas Materials Institute (TMI), The University of Texas at Austin, Austin, TX, 78712-1591, USA., Self EC; Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA., Yin L; X-ray Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL, 60439, USA., Wang P; Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL, 32306, USA., Li X; Argonne National Laboratory, 9700S. Cass Avenue, Lemont, IL, 60439, USA., Jena P; Department of Physics, Virginia Commonwealth University, Richmond, VA, 23284, USA., Nanda J; Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA., Mitlin D; Materials Science and Engineering Program & Texas Materials Institute (TMI), The University of Texas at Austin, Austin, TX, 78712-1591, USA.
Jazyk: angličtina
Zdroj: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2021 Dec 06; Vol. 60 (50), pp. 26158-26166. Date of Electronic Publication: 2021 Nov 08.
DOI: 10.1002/anie.202110699
Abstrakt: A strategy for modifying the structure of solid-state electrolytes (SSEs) to reduce the cation diffusion activation energy is presented. Two heavily W-doped sodium thioantimonate SSEs, Na 2.895 W 0.3 Sb 0.7 S 4 and Na 2.7 W 0.3 Sb 0.7 S 4 are designed, both exhibiting exceptionally low activation energy and enhanced room temperature (RT) ionic conductivity; 0.09 eV, 24.2 mS/cm and 0.12 eV, 14.5 mS/cm. At -15 °C the Na 2.895 W 0.3 Sb 0.7 S 4 displays a total ionic conductivity of 5.5 mS/cm. The 30 % W content goes far beyond the 10-12 % reported in the prior studies, and results in novel pseudo-cubic or orthorhombic structures. Calculations reveal that these properties result from a combination of multiple diffusion mechanisms, including vacancy defects, strongly correlated modes and excessive Na-ions. An all-solid-state battery (ASSB) using Na 2.895 W 0.3 Sb 0.7 S 4 as the primary SSE and a sodium sulfide (Na 2 S) cathode achieves a reversible capacity of 400 mAh g -1 .
(© 2021 Wiley-VCH GmbH.)
Databáze: MEDLINE
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