MOF衍生钴氧化物材料的制备及其电化学性能  

Preparation and electrochemical performance of MOF-derived Cobalt Oxide Materials

作　　者：黄启高 欧阳海波[1] 刘长青[1] 张晨鸽 HUANG Qi-gao;OUYANG Hai-bo;LIU Chang-qing;ZHANG Chen-ge(School of Materials Science and Engineering,Shaanxi University of Science&Technology,Xi′an 710021,China)

机构地区：[1]陕西科技大学材料科学与工程学院,陕西西安710021

出　　处：《陕西科技大学学报》2020年第5期126-131,共6页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(51402177);陕西省科技厅重点研发计划项目(2019GY-160)。

摘　　要：将金属有机框架材料(Metal-organic frameworks,MOFs)衍生出纳米尺寸的过渡金属氧化物均匀分散在石墨烯材料上,能够大大地降低纳米颗粒的团聚和体积效应,提高锂离子电池的容量及其循环性能.研究了金属有机骨架材料沸石咪唑酯骨架(Zeolitic imidazolate framework,ZIF-67)在氧化石墨烯(GO)纳米片上的自组装生长,通过GO/ZIF-67的热处理,将超细的Co 3O 4纳米晶均匀的分布在石墨烯纳米片上.通过调整前驱体ZIF-67的质量来调节Co 3O 4在石墨烯表面的分散情况.结果表明,石墨烯/Co 3O 4作为锂离子电池的负极材料,表现出良好的倍率性能(5 A·g^-1的电流密度下仍能保持550 mAh·g^-1的容量)和良好的循环稳定性(在0.2 A·g^-1的电流密度下200次循环后860 mAh·g^-1).In this paper,the nano-sized transition metal oxides derived from metal-organic frameworks(MOFs)are uniformly dispersed on graphene carbon materials,which can greatly reduce the agglomeration and volume effect of nanoparticles,and improve the capacity and cycling performance of lithium ion batteries.This work presents the self-assembly growth of zeolitic imidazolate framework(ZIF-67)on graphene oxides(GO)nanosheets.Ultrafine Co 3O 4 nanocrystals are uniformly spread on graphene nanosheets through pyrolysis of GO/ZIF-67.The dispersion of Co 3O 4 on graphene surface was regulated by adjusting the amount of precursor ZIF-67.The results show that graphene/Co 3O 4,as the anode material of lithium Li-ion batteries,manifests good rate behavior(550 mAh·g^-1 at the current density of 5 A·g^-1)and long-term cycling stability(860 mAh·g^-1 after 200 cycles at the current density of 0.2 A·g^-1).

关 键 词：ZIF-67 钴基材料 石墨烯 锂离子电池 

分 类 号：TB333[一般工业技术—材料科学与工程]