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Intercalation-type catalyst for non-aqueous room temperature sodium-sulfur batteries
Ambient-temperature sodium-sulfur (Na-S) batteries are potential attractive alternatives to lithium-ion batteries owing to their high theoretical specific energy of 1,274 Wh kg(−1) based on the mass of Na(2)S and abundant sulfur resources. However, their practical viability is impeded by sodium poly...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10582099/ https://www.ncbi.nlm.nih.gov/pubmed/37848498 http://dx.doi.org/10.1038/s41467-023-42383-3 |
Sumario: | Ambient-temperature sodium-sulfur (Na-S) batteries are potential attractive alternatives to lithium-ion batteries owing to their high theoretical specific energy of 1,274 Wh kg(−1) based on the mass of Na(2)S and abundant sulfur resources. However, their practical viability is impeded by sodium polysulfide shuttling. Here, we report an intercalation-conversion hybrid positive electrode material by coupling the intercalation-type catalyst, MoTe(2), with the conversion-type active material, sulfur. In addition, MoTe(2) nanosheets vertically grown on graphene flakes offer abundant active catalytic sites, further boosting the catalytic activity for sulfur redox. When used as a composite positive electrode and assembled in a coin cell with excess Na, a discharge capacity of 1,081 mA h g(s)(−1) based on the mass of S with a capacity fade rate of 0.05% per cycle over 350 cycles at 0.1 C rate in a voltage range of 0.8 to 2.8 V is realized under a high sulfur loading of 3.5 mg cm(−2) and a lean electrolyte condition with an electrolyte-to-sulfur ratio of 7 μL mg(−1). A fundamental understanding of the electrocatalysis of MoTe(2) is further revealed by in-situ synchrotron-based operando X-ray diffraction and ex-situ time-of-flight secondary ion mass spectrometry. |
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