乳液界面法制备的氮掺杂的C/ZnCo_(2)O_(4)复合材料及电化学性能研究  

Electrochemical properties of nitrogen-doped C/ZnCo_(2)O_(4)composites prepared by emulsion interfacial method

作　　者：张家豪 李继 冉燕 黄鑫 王石泉[1] 刘建文[1] 易琼[1] ZHANG Jiahao;LI Ji;RAN Yan;HUANG Xin;WANG Shiquan;LIU Jianwen;YI Qiong(College of Chemistry and Chemical Engineering,Hubei University,Wuhan 430062,China)

机构地区：[1]湖北大学化学化工学院,湖北武汉430062

出　　处：《湖北大学学报（自然科学版）》2023年第2期270-279,共10页Journal of Hubei University：Natural Science

基　　金：湖北三峡实验室开放/创新基金(SK211005)资助。

摘　　要：以Zn(Ac)_(2)·2H_(2)O、Co(Ac)2·4H_(2)O、2-甲基咪唑为原料,采用乳液界面法合成不同浓度的前驱体金属有机框架)MOFs)材料(Zn,Co-ZIF),然后将三种前驱体在氩气气氛下热解处理得到含氮掺杂的碳和ZnCo_(2)O_(4)复合物(ZCO),探究合成产物的形貌结构以及电化学性能等方面存在的不同.结果表明,当有机配体(2-甲基咪唑)的质量为4 g时所得产物(ZCO-2)有较高的放电比容量和较好的循环性能与倍率性能,循环100圈后仍有793.5 mAh·g^(-1)的可逆放电比容量.采用双金属离子合成金属有机框架)MOFs)中的ZIF,经高温热解处理后引入氮掺杂的碳,增加材料的导电性,从而解决ZnCo_(2)O_(4)循环性能较差的问题,制备的ZCO-2样品可以作为较有潜力的锂离子电池负极材料.Using Zn(Ac)_(2)·2H_(2)O,Co(Ac)_(2)·4H_(2)O,and 2-methylimidazole as raw materials,metal-organic framework(MOFs)materials(Zn,Co-ZIF)precursors with different concentrations were synthesized by emulsion interface method,and then the nitrogen-doped carbon and ZnCo_(2)O_(4)(ZCO)composites were obtained by pyrolysis of the three precursors in argon atmosphere.The morphologies and electrochemical performance of the synthesized products were investigated.The results show that when the mass of organic ligand(2-methylimidazole)is 8.0 g,the product(ZCO-2)exhibits higher specific discharge capacity,better cycling performance and rate performance,which remains at 793.5 mAh·g^(-1)of reversible discharge capacity after 100 cycles.By using bimetallic ions to synthesize MOFs precursors,the nitrogen-doped carbon was introduced to increase the conductivity of ZnCo_(2)O_(4)prepared after high temperature pyrolysis of MOF precursors,so as to solve the problem of cycling performance of ZnCo_(2)O_(4).The as-prepared ZCO samples can be used as a potential anode material for lithiumion batteries.

关 键 词：锂离子电池 负极材料 ZnCo_(2)O_(4) 电化学性能 

分 类 号：TQ132.41[化学工程—无机化工]