Abstract
Sodium superionic conductors are keys to realize room-temperature and high safety all-solid-state sodium batteries. Sulfide based sodium superionic conductors are promising but most reported examples are based on group 15 elements. To extend the horizon, we demonstrate a development route from group 14 elements based sodium chalcogenide. Na4Sn0.67Si0.33S4 shows a distinctly new structure with space group I41/acd and 3D diffusion pathway by silicon doping in Na4SnS4, which exhibits 2 orders of magnitude conductivity improvement than that of the mother compound Na4SnS4. And the Na4Sn0.67Si0.33S4 can be taken as a high tolerance structural template for chemical manipulation. Based on the structural template, aliovalent substitution of P5+ for M4+ leads to a wide range of solid solutions of Na4-x[Sn0.67Si0.33]1-xPxS4 (0 ≤ x ≤ 0.4) with enhanced sodium conductivity. The highest ionic conductivity reaches 1.6 × 10−3 S cm−1 with x = 0.25. Change of vacancy population and weak Na-S interaction induced from P doping are main reasons for the improvement of ionic conductivity. In addition, excellent air stability is demonstrated. This work expands the exploration opportunities and provides further understanding of structure-property relationship for sodium superionic conductors.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
