Liang Yazhan, Song Ning, Zhang Zhengchunyu, Chen Weihua, Feng Jinkui, Xi Baojuan, Xiong Shenglin
National Engineering Research Center for Advanced Polymer Processing Technology, Key Laboratory of Material Processing & Mold (Ministry of Education), Zhengzhou University, Zhengzhou, 450001, P. R. China.
School of Chemistry and Chemical Engineering, and State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, P. R. China.
Adv Mater. 2022 Jul;34(28):e2202673. doi: 10.1002/adma.202202673. Epub 2022 Jun 6.
Sodium-ion batteries (SIBs) have emerged as an alternative technology because of their merits in abundance and cost. Realizing their real applications, however, remains a formidable challenge. One is that among the limitations of anode materials, the alloy-type candidates tolerate fast capacity fading during cycling. Here, a 3D framework superstructure assembled with carbon nanobelt arrays decorated with a metallic bismuth (Bi) nanospheres coated carbon layer by thermolysis of Bi-based metal-organic framework nanorods is synthesized as an anode material for SIBs. Due to the unique structural superiority, the anode design promotes excellent sodium-storage performance in terms of high capacity, excellent cycling stability, and ultrahigh rate capability up to 80 A g with a capacity of 308.8 mAh g . The unprecedented sodium-storage ability is not only attributed to the unique hybrid architecture, but also to the production of a homogeneous and thin solid electrolyte interface layer and the formation of uniform porous nanostructures during cycling in the ether-based electrolyte. Importantly, deeper understanding of the underlying cause of the performance improvement is illuminated, which is vital to provide the theoretical basis for application of SIBs.
钠离子电池（SIBs）因其在资源丰富性和成本方面的优势而成为一种替代技术。然而，要实现其实际应用仍然是一项艰巨的挑战。其中一个问题是，在负极材料的局限性中，合金型候选材料在循环过程中容量会快速衰减。在此，通过对铋基金属有机框架纳米棒进行热解，合成了一种由碳纳米带阵列组装而成的三维框架超结构，该阵列装饰有涂覆碳层的金属铋（Bi）纳米球，作为SIBs的负极材料。由于独特的结构优势，这种负极设计在高容量、优异的循环稳定性以及高达80 A g的超高倍率性能（容量为308.8 mAh g）方面展现出卓越的储钠性能。这种前所未有的储钠能力不仅归因于独特的混合结构，还归因于在醚基电解质中循环时形成了均匀且薄的固体电解质界面层以及均匀多孔纳米结构。重要的是，对性能提升背后原因有了更深入的理解，这对于为SIBs的应用提供理论基础至关重要。
