Guan Baole, Yang Shao-Jie, Tian Shu-Hui, Sun Ting, Wang Peng-Fei, Yi Ting-Feng
Department of Chemistry, College of Sciences, Northeastern University, Shenyang 110819, China.
Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province, School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, China.
J Colloid Interface Sci. 2023 Nov 15;650(Pt A):369-380. doi: 10.1016/j.jcis.2023.07.002. Epub 2023 Jul 1.
Transition metal sulfides with the high theoretical capacity and low cost have been considered as advanced anode candidate for alkali metal ion batteries, but suffered from unsatisfactory electrical conductivity and huge volume expansion. Herein, a multidimensional structure Cu-doped CoS@MoS in-situ-grown on N-doped carbon nanofibers (denoted as Cu-CoS@MoS NCNFs) have been elaborately constructed for the first time. The bimetallic zeolitic imidazolate framework CuCo-ZIFs were encapsulated in the one-dimensional (1D) NCNFs through an electrospinning route and then on which the two-dimensional (2D) MoS nanosheets were in-situ grown via a hydrothermal process. The architecture of 1D NCNFs can effectively shorten ion diffusion path and enhance electrical conductivity. Besides, the formed heterointerface between MOF-derived binary metal sulfides and MoS can provide extra active centers and accelerate reaction kinetics, which guarantee a superior reversibility. As expected, the resulting Cu-CoS@MoS NCNFs electrode delivers excellent specific capacity of Na-ion batteries (845.6 mAh/g at 0.1 A/g), Li-ion batteries (1145.7 mAh/g at 0.1 A/g), and K-ion batteries (474.3 mAh/g at 0.1 A/g). Therefore, this innovative design strategy will bring a meaningful prospect for developing high-performance multi-component metal sulfides electrode for alkali metal ion batteries.
具有高理论容量和低成本的过渡金属硫化物被认为是碱金属离子电池的先进负极候选材料，但存在电导率不理想和体积膨胀巨大的问题。在此，首次精心构建了一种在氮掺杂碳纳米纤维上原位生长的多维结构Cu掺杂CoS@MoS（表示为Cu-CoS@MoS NCNFs）。通过静电纺丝路线将双金属沸石咪唑酯骨架CuCo-ZIFs封装在一维（1D）NCNFs中，然后通过水热过程在其上原位生长二维（2D）MoS纳米片。1D NCNFs的结构可以有效缩短离子扩散路径并提高电导率。此外，MOF衍生的二元金属硫化物与MoS之间形成的异质界面可以提供额外的活性中心并加速反应动力学，从而保证了优异的可逆性。正如预期的那样，所得的Cu-CoS@MoS NCNFs电极在钠离子电池（0.1 A/g时为845.6 mAh/g）、锂离子电池（0.1 A/g时为1145.7 mAh/g）和钾离子电池（0.1 A/g时为474.3 mAh/g）中都具有出色的比容量。因此，这种创新的设计策略将为开发用于碱金属离子电池的高性能多组分金属硫化物电极带来有意义的前景。
