College of Chemistry, Zhengzhou University, Zhengzhou450001, Henan Province, P. R. China.
College of Computer, National University of Defense Technology, Changsha410073, China.
ACS Appl Mater Interfaces. 2023 Jan 25;15(3):4011-4020. doi: 10.1021/acsami.2c18444. Epub 2023 Jan 11.
Due to the high electrical conductivity and abundant redox active sites, bimetal sulfides are highly competitive anode materials for sodium storage with long-life and high-rate. Herein, a heterostructured metal sulfide (BiS-CuS) with a carbon-based support is prepared by calcination and ion exchange methods. The synergistic effects of the heterostructure and defective structure provide facile diffusion channels, fast Na migration, and plentiful active sites for Na, which reflect in the impressive electrochemical performance with a high reversible capacity of 592.2 mA h g after 1000 cycles at 8 A g. Furthermore, the Na-ion full batteries exhibit an ultra-long cycling performance with a value of 216 mA h g after 4000 cycles at 10 A g. Interestingly, the defective structure of BiS remains after cycling. Kinetic analyses and density functional theoretical calculations clarified that the heterointerfacial structure, especially on the interface containing sulfur defects in BiS of BiS-CuS, could induce feasible ion adsorption and promote ion transfer, which lays the foundation for achieving ultrafast sodiation kinetics.
由于具有高导电性和丰富的氧化还原活性位点,双金属硫化物是一种极具竞争力的用于钠存储的长寿命、高倍率的阳极材料。在此,通过煅烧和离子交换方法制备了一种具有碳基载体的异质结构金属硫化物(BiS-CuS)。异质结构和缺陷结构的协同作用提供了易于扩散的通道、快速的 Na 迁移以及丰富的 Na 活性位点,这反映在令人印象深刻的电化学性能上,在 8 A g 的电流密度下循环 1000 次后具有 592.2 mA h g 的高可逆容量。此外,钠离子全电池在 10 A g 的电流密度下循环 4000 次后仍具有超长效的循环性能,容量值为 216 mA h g。有趣的是,循环后 BiS 的缺陷结构仍然存在。动力学分析和密度泛函理论计算表明,异质界面结构,特别是 BiS-CuS 中含硫缺陷的 BiS 界面,能够诱导可行的离子吸附并促进离子转移,这为实现超快钠化动力学奠定了基础。