摘要
针对水系镁离子电池正极材料循环不稳定及电化学性能差的问题,采用Mn_(3)O_(4)作为水系镁离子电池正极材料,通过简单的溶液共沉淀法将Mn_(3)O_(4)与碳纳米管(CNTs)原位复合形成Mn_(3)O_(4)/CNTs。经X射线粉末衍射仪(X-ray diffractometer,XRD)、扫描电子显微镜(scanning electron microscopy,SEM)、通射电子显微镜(transmission electron microscopy,TEM)和循环伏安(cyclic voltammetry,CV)及充放电测试等表征,结果表明CNTs表面均匀附着尖晶石型Mn_(3)O_(4)纳米颗粒,提高了Mn_(3)O_(4)电极的导电性和电化学性能。Mn_(3)O_(4)/CNTs正极材料在100 mA/g下表现出305 mAh/g的比容量及长循环寿命,远高于Mn_(3)O_(4)的电池性能。Mn_(3)O_(4)/CNTs材料作为水系镁离子电池正极材料具有潜在的应用价值。
Cathode materials for aqueous magnesium-ion battery face some limitations such as poor cycling stabilities and electrochemical performance.Herein,Mn_(3)O_(4)/carbon nanotubes(CNTs)nanocomposites were successfully synthesized via a facile and low-cost chemical precipitation route.The nanocomposites were characterized by X-ray diffraction(XRD),scan⁃ning electron microscopy(SEM),transmission electron microscopy(TEM),respectively.The spinel Mn_(3)O_(4)nanoparticles are highly dispersed on the surface of carbon nanotubes.Cyclic voltammetry(CV)and galvanostatic charge/discharge technique are performed for the Mn_(3)O_(4)/CNTs nanocomposites,the specific capacity of Mn_(3)O_(4)/CNTs nanocomposites is about 305 mAh/g at the current density of 100 mA/g with a long life time,which is much higher than the performance of Mn_(3)O_(4).Mn_(3)O_(4)/CNTs shows a promising cathode candidate for aqueous magnesium-ion battery.
作者
潘海洋
陈桂林
蔡锋石
PAN Haiyang;CHEN Guilin;CAI Fengshi(School of Materials Science and Engineering,Tianjin 300384,China;National Demonstration Center for Experimental Function Materials Education,Tianjin 300384,China;Tianjin Key Laboratory for Photoelectric Materials and Devices,Tianjin University of Technology,Tianjin 300384,China)
出处
《天津理工大学学报》
2022年第1期18-22,共5页
Journal of Tianjin University of Technology
基金
国家级大学生创新项目(201810060011)。
