Orthorhombic Nb₂O₅ Decorated Carbon Nanoreactors Enable Bidirectionally Regulated Redox Behaviors in Room-Temperature Na-S Batteries
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(Published version)
Date
2023
Authors
Huang, X.L.
Zhang, X.
Zhou, L.
Guo, Z.
Liu, H.K.
Dou, S.X.
Wang, Z.
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Journal article
Citation
Advanced Science, 2023; 10(4):2206558-1-2206558-12
Statement of Responsibility
Xiang Long Huang, Xiaofeng Zhang, Liujiang Zhou, Zaiping Guo, Hua Kun Liu, Shi Xue Dou, and Zhiming Wang
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Abstract
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 Nb₂O₅ Na-ion conductor, is proposed to functionalize porous carbon nanoreactors (CNR) for S cathodes. The Nb₂O₅ is shown to chemically immobilize sodium polysulfides via strong affinity. Theoretical and experimental evidence reveals that the Nb₂O₅ 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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First published: 05 December 2022
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©2022 The Authors. Advanced Science published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.