题目：Metal organic frameworks-derived multi-shell copper-cobalt-zinc sulfide cubes for sodium-ion battery anode
作者：Xiaoli Lua, Xinyi Zhoua, Ransha Denga, Xijun Weib, Xiaoqin Liua, Qiaoji Zhenga, Dunmin Lina* and Yingze Songb*
单位：aCollege of Chemistry and Materials science, Sichuan Normal University, Chengdu 610066, P. R. China.
bState Key Laboratory of Environment-Friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, P. R. China.
摘要：Transition metal sulfides (TMSs) have been considered as one type of promising anode materials for sodium-ion batteries (SIBs) due to their high theoretical capacity and outstanding redox reversibility. However, the application of TMSs for SIB anode still faces the fatal challenge mainly pertaining to rapid capacity decay and slow reaction kinetics. Herein, we employ Cu/Zn co-doped ZIF-67 (Cu/Zn-ZIF-67) as the precursor to prepare multi-shell hollow carbon-coated Cu39S28-CoS2-ZnS@nitrogen doped carbon cubes (CCZS@NC@C-15), where the outer shell is a carbon coating layer, and the interior is the double shells formed by Cu39S28, CoS2 and ZnS in a porous nitrogen-rich carbon matrix. The as-prepared CCZS@NC@C-15 with unique multi-shell structure can not only effectively buffer the volumetric stress during the sodium insertion/extraction processes, but also increase the volume utilization rate of anode materials. Additionally, the porous carbon cube structure not only increases the contact area between the anode materials and the electrolyte but also prevent the agglomeration of active particles effectively. Furthermore, the carbon coating layer combine with the internal N-rich carbon matrix increases the conductivity of anode and improve the electrochemical stability. As a result, the as-prepared CCZS@NC@C-15 anode shows the remarkable electrochemical stability and rate capability. Our research provides a new strategy for the rational design of TMSs with unique structure for high-performance SIBs.
期刊及影响因子：Chemical Engneering Journal; 13.273.
链接：https://www.sciencedirect.com/science/article/pii/S1385894721030825#!