ZnS-Sb2S3@C Core-Double Shell Polyhedron Structure Derived from Metal-Organic Framework as Anodes for High Performance Sodium Ion Batteries
ZnS-Sb2S3@C Core-Double Shell Polyhedron Structure Derived from Metal-Organic Framework as Anodes for High Performance Sodium Ion Batteries
复制标题
金属有机骨架ZnS-Sb2S3@C核-双壳多面体结构作为高性能钠离子电池负极
DOI：
10.1021/acsnano.7b03321
复制
发表时间：
2017-06-01
期刊：
影响因子：
17.1
通讯作者：
Yin, Longwei
中科院分区：
文献类型：
--
作者：
Dong, Shihua;Li, Caixia;Yin, Longwei
利用ZIF-8分子筛的咪唑骨架，通过Zn ~（2+）与硫代乙酰胺（TAA）中的S ~（2-）发生硫化反应，再通过Zn ~（2+）与Sb ~（3+）之间的金属阳离子交换反应，合成了ZnS-Sb_2S_3@C核-双壳多面体结构。以ZnS为内核，Sb 2S 3/C为双壳的多面体复合材料作为钠离子电池负极，具有循环稳定性好、库仑效率高、比容量大等优点。特别地，引入碳壳不仅作为重要的保护层以形成刚性结构并适应体积变化，而且还改善了电子传导性以优化稳定的循环性能和优异的倍率性能。ZnS内核和Sb 2S 3/C复合壳层构成的结构不仅有利于电解液的渗透，缩短Na离子的扩散长度，改善电化学反应动力学，而且防止了Na离子插入/拔出引起的结构粉化。这种制备基于MOFs的金属硫化物的方法可以进一步扩展到设计用于高性能储能器件的其他纳米结构系统。
Taking advantage of zeolitic imidazolate framework (ZIF-8), ZnS-Sb2S3@C core-double shell polyhedron structure is synthesized through a sulfurization reaction between Zn2+ dissociated from ZIF-8 and S2- from thioacetamide (TAA), and subsequently a metal cation exchange process between Zn2+ and Sb-,(3+) in which carbon layer is introduced from polymeric resorcinol-formaldehyde to prevent the collapse of the polyhedron. The polyhedron composite with a ZnS inner-core and Sb2S3/C double-shell as anode for sodium ion batteries (SIBs) shows us a significantly improved electrochemical performance with stable cycle stability, high Coulombic efficiency and specific capacity. Peculiarly, introducing a carbon shell not only acts as an important protective layer to form a rigid construction and accommodate the volume changes, but also improves the electronic conductivity to optimize the stable cycle performance and the excellent rate property. The architecture composed of ZnS inner core and a complex Sb2S3/C shell not only facilitates the facile electrolyte infiltration to reduce the Na-ion diffusion length to improve the electrochemical reaction kinetics, but also prevents the structure pulverization caused by Na-ion insertion/extraction. This approach to prepare metal sulfides based on MOFs can be further extended to design other nanostructured systems for high performance energy storage devices.