Journal
ACS APPLIED ENERGY MATERIALS
Volume 4, Issue 7, Pages 7250-7258Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c01367
Keywords
sodium solid electrolyte; ion conduction; structure-transport relationships; solid-state battery; X-ray diffraction; vacancy concentration
Funding
- Deutsche Forschungsgemeinschaft (DFG) [ZE 1010/4-1]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
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The exploration of sulfidic sodium solid electrolytes and their design plays a significant role in the advancement of solid-state sodium batteries by understanding fast sodium transport. The influence of aliovalent substitution on the structure and transport properties in Na11+xSn2P1-xMxS12 with M = Ge and Sn was investigated, revealing that Na+ vacancy concentrations are a key factor in Na11Sn2PS12-type materials.
Exploration of sulfidic sodium solid electrolytes and their design contributes to advances in solid-state sodium batteries. Such a design is guided by a better understanding of fast sodium transport, for instance, in the herein studied Na11Sn2PS12-type materials. By using Rietveld refinements against synchrotron X-ray diffraction and electrochemical impedance spectroscopy, the influence of aliovalent substitution on the structure and transport in Na11+xSn2P1-xMxS12 with M = Ge and Sn is investigated. Although Sn induces stronger structural changes than Ge, the influence on the sodium sublattice and the ionic transport properties is comparable. Overall, a reduced in-grain activation energy of Na+ transport can be found with the reducing Na+ vacancy concentration. This work explores previously unreported phases in the Na11Sn2PS12 structure type based on their determined properties revealing Na+ vacancy concentrations to be an important factor providing a further understanding of Na11Sn2PS12-type materials.
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