Z-CoS_(2)-MoS_(2)/rGO的合成及电化学储锂性能  

Synthesis of Z-CoS_(2)-MoS_(2)/rGO composite and its electrochemical lithium storage performance

作　　者：姜孝男 徐刚 陈卫祥[1] JIANG Xiao-nan;XU Gang;CHEN Wei-xiang(Department of Chemistry,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学化学系,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2022年第1期152-160,共9页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(21473156);浙江省科技计划资助项目(2015C01001)。

摘　　要：为了研发比容量高和循环性能稳定的电化学储锂电极材料,用二甲基咪唑钴(ZIF-67)作为Co源前驱体,通过一步水热法制备Z-CoS_(2)-MoS_(2)/rGO(还原氧化石墨烯)复合材料,研究微观结构和电化学储锂性能.结果表明,与采用CoCl2作为钴源制得的CoS_(2)-MoS_(2)/rGO相比,Z-CoS_(2)-MoS_(2)/rGO复合材料中CoS_(2)粒子有着更加细小和较均匀的粒径,很好地分散在MoS_(2)和rGO表面,形成了相应的异质结构.作为电化学储锂电极材料,Z-CoS_(2)-MoS_(2)/rGO的可逆比容量可以达到1092 mA·h/g,经900次循环后在500 mA/g电流密度下保持了941 mA·h/g的储锂可逆比容量,显示了稳定的充放电循环性能.Z-CoS_(2)-MoS_(2)/rGO优异的电化学储锂性能主要归因于该双金属硫化物复合材料具有较多的电化学储锂电极反应电对以及复合材料中CoS_(2)纳米颗粒、MoS_(2)纳米片和rGO之间均匀的复合及所形成的异质结构.Dimethyl imidazole cobalt(ZIF-67)was employed as the cobalt source precursor to prepare Z-CoS_(2)-MoS_(2)/rGO(reduced graphene oxide)composite material by one-step hydrothermal method in order to develop the electrode materials for electrochemical lithium storage with high specific capacity and stable cycle performance.The microstructure and electrochemical lithium storage performance were analyzed.Results showed that the CoS_(2) particles in the Z-CoS_(2)-MoS_(2)/rGO composite had a smaller and more uniform particle size compared with CoS_(2)-MoS_(2)/rGO prepared by using CoCl2 as the cobalt source,and dispersed in MoS_(2) and the surface of rGO,forming the corresponding heterostructure.The reversible specific capacity of Z-CoS_(2)-MoS_(2)/rGO can reach 1092 mA·h/g as an electrochemical lithium storage electrode material,and maintains 941 mA·h/g at a current density of 500 mA/g after 900 cycles,demonstrating its stable cycle performance.The excellent electrochemical lithium storage performance of Z-CoS_(2)-MoS_(2)/rGO is mainly attributed to the bimetallic sulfide composite that has more redox pairs for electrochemical lithium storage and the heterostructure formed by the uniform composited of CoS_(2) nanoparticles,MoS_(2) nanosheets and rGO.

关 键 词：金属硫化物复合材料 二甲基咪唑钴 二硫化钴 二硫化钼 电化学储锂 

分 类 号：TM911[电气工程—电力电子与电力传动]