Molybdenum Carbide Electrocatalyst In Situ Embedded in Porous Nitrogen‐Rich Carbon Nanotubes Promotes Rapid Kinetics in Sodium‐Metal–Sulfur Batteries (Adv. Mater. 26/2022)

Hao, Hongchang; Wang, Yixian; Katyal, Naman; Yang, Guang; Dong, Hui; Liu, Pengcheng; Hwang, Sooyeon; Mantha, Jagannath; Henkelman, Graeme; Xu, Yixin; Boscoboinik, J. Anibal; Nanda, Jagjit; Mitlin, David

doi:10.1002/adma.202270199

Cited by 17 publications

(25 citation statements)

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“…With discharging to 1.8 V, two new peaks emerged at binding energies of 163.10 and 163.75 eV, respectively. According to the previous reports, [ 42,68 ] it was caused by the formation of high‐order Na 2 S x ( x = 4–8). When the voltage reached down to 1.5 V, the two peaks evidently shifted to 162.78 and 163.35 eV, respectively.…”

Section: Resultsmentioning

confidence: 86%

Orthorhombic Nb₂O₅ Decorated Carbon Nanoreactors Enable Bidirectionally Regulated Redox Behaviors in Room‐Temperature Na–S Batteries

et al. 2022

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Regulating redox kinetics is able to spur the great-leap-forward development of room-temperature sodium-sulfur (RT Na-S) batteries, especially on propelling their Na-ion storage capability. Here, an innovative metal oxide kinetics accelerator, orthorhombic Nb 2 O 5 Na-ion conductor, is proposed to functionalize porous carbon nanoreactors (CNR) for S cathodes. The Nb 2 O 5 is shown to chemically immobilize sodium polysulfides via strong affinity. Theoretical and experimental evidence reveals that the Nb 2 O 5 can bidirectionally regulate redox behaviors of S cathodes, which accelerates reduction conversions from polysulfides to sulfides as well as promotes oxidation reactions from sulfides to S. In situ and ex situ characterization techniques further verify its electrochemical lasting endurance in catalyzing S conversions. The well-designed S cathode demonstrates a high specific capacity of 1377 mA h g −1 at 0.1 A g −1 , outstanding rate capability of 405 mA h g −1 at 2 A g −1 , and stable cyclability with a capacity retention of 617 mA h g −1 over 600 cycles at 0.5 A g −1 . An ultralow capacity decay rate of 0.0193% per cycle is successfully realized, superior to those of current state-of-the-art RT Na-S batteries. This design also suits emerging Na-Se batteries, which contribute to outstanding electrochemical performance as well.

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Section: Resultsmentioning

confidence: 86%

Orthorhombic Nb₂O₅ Decorated Carbon Nanoreactors Enable Bidirectionally Regulated Redox Behaviors in Room‐Temperature Na–S Batteries

et al. 2022

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“…For Cu 2 S + 2Na + + 2e − → Na 2 S + 2Cu, there are two sloping plateaus corresponding to stepwise sodiation through intermediate solid‐state products such as Na 2 S 2 . [ 83–88 ] During the first desodiation to 1 V, as well as in the four subsequent cycles, both Na 2 Te@CF and Na 2 S@CF deliver negligible capacity, confirming kinetic irreversibility.…”

Section: Resultsmentioning

confidence: 88%

Intermetallics Based on Sodium Chalcogenides Promote Stable Electrodeposition–Electrodissolution of Sodium Metal Anodes

Wang

Dong

Katyal

et al. 2023

Advanced Energy Materials

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Sodiophilic micro‐composite films of sodium‐chalcogenide intermetallics (Na2Te and Na2S) and Cu particles are fabricated onto commercial copper foam current collectors (Na2Te@CF and Na2S@CF). For the first time a controllable capacity thermal infusion process is demonstrated. Enhanced wetting by the metal electrodeposition leads to state‐of‐the‐art electrochemical performance. For example, Na2Te@CF‐based half‐cells demonstrate stable cycling at 6 mA cm−2 and 6 mAh cm−2, corresponding to 54 µm of Na electrodeposited/electrodissolved by geometric area. Sodium metal batteries with Na3V2 (PO4)3 cathodes are stable at 30C (7 mA cm−2) and for 10 000 cycles at 5C and 10C. Cross‐sectional cryogenic focused ion beam (cryo‐FIB) microscopy details deposited and remnant dissolved microstructures. Sodium metal electrodeposition onto Na2Te@CF is dense, smooth, and free of dendrites or pores. On unmodified copper foam, sodium grows in a filament‐like manner, not requiring cycling to achieve this geometry. Substrate–metal interaction critically affects the metal–electrolyte interface, namely the thickness and morphology of the solid electrolyte interphase. Density functional theory and mesoscale simulations provide insight into support‐adatom energetics, nucleation response, and early‐stage morphological evolution. On Na2Te sodium atomic dispersion is thermodynamically more stable than isolated clusters, leading to conformal adatom coverage of the surface.

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“…reported a composite cathode with a high sulfur loading of 12.7 mg cm − 2 (64 wt.%) and achieved stable cycling for more than 150 cycles. [ 195 ] According to the facts, in order to promote the sulfur loads from below 2 mg cm –2 to above 6 mg cm –2 , the focus for RT‐Na/S system should be set on the “teamwork” perspective that integrates the abilities of both cathode, anode, electrolyte, separator, and binder rather than developing industrial technology alone.…”

Section: Device‐scale Evaluationmentioning

confidence: 99%

The Future for Room‐Temperature Sodium–Sulfur Batteries: From Persisting Issues to Promising Solutions and Practical Applications

Yan

Zhao

Wang

et al. 2022

Adv Funct Materials

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Room‐temperature sodium–sulfur (RT‐Na/S) batteries are emerging as promising candidates for stationary energy‐storage systems, due to their high energy density, resource abundance, and environmental benignity. A better understanding of RT‐Na/S batteries in the view of the whole battery components is of essential importance for fundamental research and practical applications. In particular, the components other than sulfur cathodes in preventing the migration of polysulfides and accelerating the reaction kinetics have been greatly overlooked. Such a biased research trend is also adverse to the broader applications for RT‐Na/S batteries, which have long been ignored in previous reviews. Herein, approaches to the historical progress toward practical RT‐Na/S batteries through a “teamwork” perspective are comprehensively summarized, and balanced research trends are encouraged to enable practical RT‐Na/S batteries. In the meantime, the persisting issues, promising solutions, and practical applications of advanced sulfur host design, Na metal anode protection, electrolyte optimization, separator modification, and binder engineering are clearly emphasized. Finally, the device‐scale evaluation in practical parameters and advanced characterization tools are thoroughly provided. This review aims to provide the “teamwork” perspective on the whole‐cell design and fundamental guidelines that can shed light on research directions for practical RT‐Na/S batteries.

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Molybdenum Carbide Electrocatalyst In Situ Embedded in Porous Nitrogen‐Rich Carbon Nanotubes Promotes Rapid Kinetics in Sodium‐Metal–Sulfur Batteries (Adv. Mater. 26/2022)

Cited by 17 publications

References 0 publications

Orthorhombic Nb₂O₅ Decorated Carbon Nanoreactors Enable Bidirectionally Regulated Redox Behaviors in Room‐Temperature Na–S Batteries

Orthorhombic Nb₂O₅ Decorated Carbon Nanoreactors Enable Bidirectionally Regulated Redox Behaviors in Room‐Temperature Na–S Batteries

Intermetallics Based on Sodium Chalcogenides Promote Stable Electrodeposition–Electrodissolution of Sodium Metal Anodes

The Future for Room‐Temperature Sodium–Sulfur Batteries: From Persisting Issues to Promising Solutions and Practical Applications

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Molybdenum Carbide Electrocatalyst In Situ Embedded in Porous Nitrogen‐Rich Carbon Nanotubes Promotes Rapid Kinetics in Sodium‐Metal–Sulfur Batteries (Adv. Mater. 26/2022)

Cited by 17 publications

References 0 publications

Orthorhombic Nb2O5 Decorated Carbon Nanoreactors Enable Bidirectionally Regulated Redox Behaviors in Room‐Temperature Na–S Batteries

Orthorhombic Nb2O5 Decorated Carbon Nanoreactors Enable Bidirectionally Regulated Redox Behaviors in Room‐Temperature Na–S Batteries

Intermetallics Based on Sodium Chalcogenides Promote Stable Electrodeposition–Electrodissolution of Sodium Metal Anodes

The Future for Room‐Temperature Sodium–Sulfur Batteries: From Persisting Issues to Promising Solutions and Practical Applications

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Orthorhombic Nb₂O₅ Decorated Carbon Nanoreactors Enable Bidirectionally Regulated Redox Behaviors in Room‐Temperature Na–S Batteries

Orthorhombic Nb₂O₅ Decorated Carbon Nanoreactors Enable Bidirectionally Regulated Redox Behaviors in Room‐Temperature Na–S Batteries