Zheng Tian, Hu Pengfei, Wang Zhongchang, Guo Tianqi
School of Chemistry, Beihang University, Beijing, 100191, P. R. China.
Department of Advanced Materials and Computing, International Iberian Nanotechnology Laboratory (INL), 4715-330, Braga, Portugal.
Adv Mater. 2023 Nov;35(48):e2306577. doi: 10.1002/adma.202306577. Epub 2023 Oct 20.
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 at 1 A g and long-life cycle (10 000 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.
钠离子电池（SIBs）由于钠离子相对较大的离子半径而面临较大的电极体积变化和缓慢的氧化还原动力学，这对提高其长期循环稳定性和倍率性能提出了重大挑战。在此，有人提出将二维非晶态硒硫化铁纳米片（a-FeSeS NSs）用作SIBs的负极材料，并证明它们在1 A g下表现出528.7 mAh g的显著倍率性能以及长寿命循环（10000次循环）性能（300.4 mAh g）。该性能远优于先前报道的铁基负极材料，这归因于其非晶态结构减轻了电极的体积膨胀、二维特性促进了电子/离子传输，以及S/Se双阴离子提供了更多的反应位点并稳定了非晶态结构。这种二维非晶态策略为其他电极材料的结构工程提供了一个丰富的平台，使更安全的能源前景更接近现实。
