Self‐Formed Electronic/Ionic Conductive Fe3S4 @ S @ 0.9Na3SbS4⋅0.1NaI Composite for High‐Performance Room‐Temperature All‐Solid‐State Sodium–Sulfur Battery. Issue 34 (21st July 2020)

• Record Type: Journal Article
• Authors: Wan, Hongli; Cai, Liangting; Yao, Yu; Weng, Wei; Feng, Yuezhan; Mwizerwa, Jean Pierre; Liu, Gaozhan; Yu, Yan; Yao, Xiayin
• Is Part Of: Small. Volume 16:Issue 34(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-07-21
• Subjects: all‐solid‐state battery -- Fe 3S 4 @ S @ 0.9Na 3SbS 4⋅0.1NaI cathode -- self‐formed -- sodium–sulfur batteries; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202001574
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: Fe3 S4 @ S @ 0.9Na3 SbS4 ⋅0.1NaI composite cathode is prepared through one‐step wet‐mechanochemical milling procedure. During milling process, ionic conduction pathway is self‐formed in the composite due to the formation of 0.9Na3 SbS4 ⋅0.1NaI electrolyte without further annealing treatment. Meanwhile, the introduction of Fe3 S4 can increase the electronic conductivity of the composite cathode by one order of magnitude and nearly double enhance the ionic conductivities. Besides, the aggregation of sulfur is effectively suppressed in the obtained Fe3 S4 @ S @ 0.9Na3 SbS4 ⋅0.1NaI composite, which will enhance the contact between sulfur and 0.9Na3 SbS4 ⋅0.1NaI electrolyte, leading to a decreased interfacial resistance and improving the electrochemical kinetics of sulfur. Therefore, the resultant all‐solid‐state sodium–sulfur battery employing Fe3 S4 @ S @ 0.9Na3 SbS4 ⋅0.1NaI composite cathode shows discharge capacity of 808.7 mAh g −1 based on Fe3 S4 @S and a normalized discharge capacity of 1040.5 mAh g −1 for element S at 100 mA g −1 for 30 cycles at room temperature. Moreover, the battery also exhibits excellent cycling stability with a reversible capacity of 410 mAh g −1 at 500 mA g −1 for 50 cycles, and superior rate capability with capacities of 952.4, 796.7, 513.7, and 445.6 mAh g −1 at 50, 100, 200, and 500 mA g −1, respectively. This facile strategy for sulfur‐based composite cathode is attractive for achieving room‐temperature sodium–sulfur batteries with superior electrochemical performance. Abstract : Self‐formed electronic/ionic conduction pathways are achieved in Fe3 S4 @ S @ 0.9Na3 SbS4 ⋅0.1NaI composite cathode through one‐step wet mechanochemical milling procedure. Benefiting from these well‐designed triple‐phase contacts, the interfacial resistance is reduced and the electrochemical kinetics of sulfur in the cathode is significantly improved. The resultant room‐temperature all‐solid‐state sodium–sulfur battery shows excellent rate capability and cyclic performance.