Search for anode materials for sodium ions batteries (SIBs) attracts researchers around the world because of their high-rate capability and excellent capacity. However, their stability needs to be improved. Thus, this work demonstrates a controllable method for the synthesis of one-dimensional (1D) hollow microfibers using “egg-box-structured” Fe-alginate fibers. The goal was to obtain an SIBs anode material with the optimal number of voids for efficient Na⁺ storage. An optimized micro and pore structures were designed to obtain the shortest Na⁺-diffusion distance. The novel FeS₂/Fe₂O₃-HF composite was able to withstand volume expansion during charge/discharge processes and showed high specificity and rate capacity (483 mAh/g at 100 mA/g, 241 mAh/g at 2000 mA/g). The capacity retention of this cell was excellent: it maintained 245 mAh/g over four hundred 1000 mA/g cycles. Thus, FeS₂/Fe₂O₃-HF composite is a very promising active anode material for SIBs.

寻找钠离子电池 (SIB) 的负极材料因其高倍率性能和出色的容量吸引了世界各地的研究人员。但是，它们的稳定性需要提高。因此，这项工作展示了一种使用“蛋盒结构”海藻酸铁纤维合成一维 (1D) 中空微纤维的可控方法。目标是获得具有最佳空隙数的 SIBs 阳极材料，以实现高效的 Na ⁺存储。设计了优化的微孔结构以获得最短的Na ⁺ -扩散距离。新颖的FeS ₂ /Fe ₂ O ₃-HF 复合材料能够在充电/放电过程中承受体积膨胀​​，并显示出高特异性和倍率容量（ 100  mA/g 时为 483 mAh/g，2000  mA/g 时为 241 mAh/g）。该电池的容量保持性非常好：它 在四百个 1000  mA/g 循环中保持 245 mAh/g。因此，FeS ₂ /Fe ₂ O ₃ -HF复合材料是一种非常有前途的SIB活性负极材料。