Two-dimensional Amorphous Iron Selenide Sulfide Nanosheets for Stable and Rapid Sodium-ion Storage

Sodium ion batteries (SIBs) suffer from large electrode volume change and sluggish redox kinetics for the relatively large ionic radius of sodium ions, raising a significant challenge to improve their long-term cyclability and rate capacity. Here, we propose to apply a two-dimensional (2D) amorphous...

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Bibliographic Details
Published inAdvanced materials (Weinheim) p. e2306577
Main Authors Zheng, Tian, Hu, Pengfei, Wang, Zhongchang, Guo, Tianqi
Format Journal Article
LanguageEnglish
Published Germany 12.08.2023
Subjects
high rate
two-dimensional amorphous nanosheets
ultralong cycle life
iron selenide sulfide
sodium-ion battery
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Summary:Sodium ion batteries (SIBs) suffer from large electrode volume change and sluggish redox kinetics for the relatively large ionic radius of sodium ions, raising a significant challenge to improve their long-term cyclability and rate capacity. Here, we propose to apply a two-dimensional (2D) amorphous iron selenide sulfide nanosheets (a-FeSeS NSs) as an anode material for SIBs, and demonstrate that they exhibit remarkable rate capability of 528.7 mAh g at 1 A g and long-life cycle (10000 cycles) performance (300.4 mAh g ). This performance is much more superior to that of the previously reported Fe-based anode materials, which is attributed to their amorphous structure that alleviates volume expansion of electrode, 2D nature that facilitates electrons/ions transfer, and the S/Se double anions that offer more reaction sites and stabilize the amorphous structure. Such a 2D amorphous strategy provides a fertile platform for structural engineering of other electrode materials, making a more secure energy prospect closer to a reality. This article is protected by copyright. All rights reserved.
ISSN:1521-4095