Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 36, Pages 42927-42934Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c13000
Keywords
sodium-sulfur battery; monolithic structure; neutron powder diffraction; Al-doped Na3.4Zr2(Si0.8P0.2O4)(3); ionic transport
Funding
- China University of Mining & Technology (Beijing)
- National Natural Science Foundation of China [51672029, 51372271]
- Spanish Ministry of Science, Innovation [MAT2017-84496-R]
- ANPCyT, UNSL, Argentine [PICT2017-1842, PROICO 2-2016]
- Beijing National Laboratory for Condensed Matter Physics
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The study shows that AI doping can significantly improve the ionic conductivity of Na3.4Zr2(Si0.8P0.2O4)(3), and a solid-state sodium-sulfur battery with a monolithic structure is proposed to tackle interfacial resistance issues.
The limit of the energy density and increasing security issues on sodium-ion batteries (SIBs) impede their further development. Solid-state sodium metal batteries are potential candidates to replace the present SIBs. However, low ionic conductivity and poor interface contact hinder their progress. In this work, the impact of AI doping on the crystalline structure and ionic transport in Na3.4Zr2(Si0.8P0.2O4)(3) was studied by neutron powder diffraction. The ionic conductivity of Na3.5Zr1.9Al0.1Si2.4P0.6O12 achieves 4.43 x 10(-3 )S cm(-1) at 50 degrees C. The polarization voltage of the Na parallel to Na symmetric battery is about 40 mV after cycling for more than 1600 h. Moreover, a solid-state sodium-sulfur battery with a monolithic structure was constructed to alleviate the interfacial resistance problems. Its specific discharge capacity can still keep 300 mA h g(-1) after 480 cycles at 300 mA g(-1). The work provides a promising strategy to design solid-state sodium-sulfur batteries with high performances.
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