Wang Ping, Yuan Aihua, Wang Zhitao, Shen Xiaoping, Chen Hantao, Zhou Hu
School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, PR China.
Nanoscale. 2021 Jan 28;13(3):1988-1996. doi: 10.1039/d0nr07450k.
Hierarchical ZnS/NC dodecahedra are successfully constructed via a two-step synthetic method combining a sulfidation process and subsequent carbonization treatment, benefiting from the inherent merits of zeolitic imidazolate frameworks as ideal precursors/self-sacrificing templates. Studies reveal that the sulfidation time plays a vital role in the morphological evolution and lithium storage performances of final products. To our knowledge, this is the first example of carbon-based ZnS hierarchical materials with yolk-shell structures. When used as anode materials for lithium-ion batteries (LIBs), the resultant ZnS(x h)/NC (x is the sulfidation time) electrodes showed high lithium storage abilities, excellent cycling stabilities, and good rate capabilities. The optimal ZnS(72 h)/NC sample shows a well-defined multi-yolk-shell structure and delivers a high reversible specific capacity (757 mA h g-1 after 100 cycles at 200 mA g-1), extraordinary rate capability, and intriguing long-term cycling stability (∼500 mA h g-1 at 2 A g-1 after 1000 cycles). Such a type of architecture simultaneously integrates several attractive design principles for high-performance LIB anodes including the yolk-shell structure, nitrogen-doped carbon coupling, and ultrafine ZnS nanoparticles.
通过结合硫化过程和后续碳化处理的两步合成方法，成功构建了分级结构的ZnS/NC十二面体，这得益于沸石咪唑酯骨架作为理想前驱体/自牺牲模板的固有优点。研究表明，硫化时间对最终产物的形态演变和储锂性能起着至关重要的作用。据我们所知，这是具有蛋黄壳结构的碳基ZnS分级材料的首个实例。当用作锂离子电池（LIBs）的负极材料时，所得的ZnS(x h)/NC（x为硫化时间）电极表现出高储锂能力、优异的循环稳定性和良好的倍率性能。最佳的ZnS(72 h)/NC样品呈现出明确的多蛋黄壳结构，并具有高可逆比容量（在200 mA g-1下循环100次后为757 mA h g-1）、出色的倍率性能和引人注目的长期循环稳定性（在2 A g-1下循环1000次后约为500 mA h g-1）。这种结构同时整合了高性能LIB负极的几种有吸引力的设计原则，包括蛋黄壳结构、氮掺杂碳耦合和超细ZnS纳米颗粒。
