ZnMn2O4电极材料的简单制备及储锂性能研究  

Facile preparation and lithium storage properties of ZnMnO electrode materials

作　　者：张天戈 吴晶晶 李延伟 姚金环[1,2] ZHANG Tiange;WU Jingjing;LI Yanwei;YAO Jinhuan(Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials,Guilin 541004,China;College of Chemistry and Bioengineering,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]广西电磁化学功能物质重点实验室,广西桂林541004 [2]桂林理工大学化学与生物工程学院,广西桂林541004

出　　处：《功能材料》2020年第9期9083-9090,共8页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51964012);广西自然科学基金资助项目(2017GXNSFAA198117)。

摘　　要：以蔗糖为软模板剂,采用混合液体直接焙烧的方法制备了ZnMn2O4电极材料,利用XRD、FESEM、电化学性能测试等手段研究了蔗糖用量对合成的ZnMn2O4电极材料结构、形貌和储锂性能的影响规律。研究发现,当原料中Zn^2+与蔗糖的摩尔比为1∶1.5时,制备出的ZnMn2O4样品(ZMO-1.5)为不规则颗粒与纳米片混合结构,且其储锂性能相对最好。在0.5 A/g的电流密度下经过200次循环后,可逆容量仍可达到575 mAh/g,即使在5 A/g的高电流密度下仍具有295 mAh/g的可逆容量。电化学反应动力学分析发现,ZMO-1.5样品电极的电化学反应阻抗值相对最小,锂离子扩散系数相对最大。该研究可望为简便低成本制备高性能ZnMn2O4电极材料提供指导和理论参考。ZnMn2O4 electrode materials were prepared by directly roasting mixed liquid with sucrose as the soft template.The influences of the amounts of sucrose on the structure,morphology and lithium storage properties of the synthesized ZnMn2O4 electrode materials were studied by XRD,FESEM,and electrochemical performance tests.When the molar ratio of Zn^2+to sucrose in the raw materials was 1∶1.5,the prepared ZnMn2O4 sample showed a mixed morphology of irregular particles and nano-sheets,and exhibited the best lithium storage performance.The reversible capacity could reach 575 mAh/g after 200 cycles at 0.5 A/g current density.Even at the high current density of 5 A/g,it still delivered a reversible capacity of 295 mAh/g.The electrochemical reaction kinetic analysis showed that the ZMO-1.5 electrode had the lowest electrochemical reaction resistance and the highest lithium ion diffusion coefficient.This study was expected to provide guidance and theoretical reference for the facile and low-cost preparation of high performance ZnMn2O4 electrode materials.

关 键 词：ZnMn2O4 锂离子电池 负极材料 蔗糖 储锂性能 

分 类 号：TQ152[化学工程—电化学工业]