2D Amorphous Iron Selenide Sulfide Nanosheets for Stable and Rapid Sodium-Ion Storage,Advanced Materials

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2D Amorphous Iron Selenide Sulfide Nanosheets for Stable and Rapid Sodium-Ion Storage
Advanced Materials ( IF 27.4 ) Pub Date : 2023-08-12 , DOI: 10.1002/adma.202306577
Tian Zheng ₁ , Pengfei Hu ₁ , Zhongchang Wang ₂ , Tianqi Guo ₂

Affiliation

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, it is proposed to apply 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⁻¹ at 1 A g⁻¹ and long-life cycle (10 000 cycles) performance (300.4 mAh g⁻¹). 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.

中文翻译：

用于稳定快速钠离子存储的二维非晶硒化铁硫化物纳米片

钠离子电池（SIB）由于钠离子的离子半径相对较大，因此电极体积变化较大，氧化还原动力学缓慢，这给提高其长期循环性能和倍率容量提出了重大挑战。在此，提出应用二维非晶硒化铁硫化物纳米片（a-FeSeS NSs）作为SIB负极材料，并证明它们在1 A g ^{-1下表现出528.7 mAh g}^-1的卓越倍率性能和长生命周期（10000次循环）性能（300.4mAh g ^-1）。这种性能远远优于之前报道的铁基负极材料，这归因于它们的无定形结构可以减轻电极的体积膨胀，二维性质有利于电子/离子转移，以及S/Se双阴离子提供更多的反应位点并稳定非晶结构。这种二维非晶策略为其他电极材料的结构工程提供了丰富的平台，使更安全的能源前景更接近现实。

更新日期：2023-08-12

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