MnO2包覆尖晶石型LiMn2O4的改性研究  

A study on the modification of spinel LiMn2O4 coated with MnO2

作　　者：谭立波 张海朗 TAN Libo;ZHANG Hailang(School of Chemistry and Materials Engineering, Jiangnan University, Wuxi 214122, China)

机构地区：[1]江南大学化学与材料工程学院,江苏无锡214122

出　　处：《功能材料》2020年第6期6062-6066,共5页Journal of Functional Materials

摘　　要：使用MnO2对尖晶石型LiMn2O4材料进行了包覆改性研究,以简单的工艺流程合成了MnO2包覆的LiMn2O4材料,具有一定的商业价值,此外对合成的材料进行了XRD、SEM以及电化学性能测试,结果表明MnO2的包覆能够很好地抑制尖晶石型LiMn2O4材料在充放电过程中由于因Mn溶解所造成的容量衰减问题,同时高温下(55℃)在50个循环后,其容量保持率达到了94.2%,循环性能优异,此外对其进行了EIS测试,结果显示MnO2的包覆能够有效地降低材料的电荷转移阻抗.In this paper,spinel LiMn2O4 material coated with MnO2 was synthesized by a simple process,which had a certain commercial value.And the synthesized materials were analyzed by XRD,SEM and electrochemical performance test.The results show that the coating of MnO2 could effectively inhibit the dissolution of Mn in Spinel LiMn2O4 during charging and discharging,and after 50 cycles at high temperature(55℃),the capacity retention was 94.2%,showing excellent cycling performance.In addition,EIS test shows that MnO2 coating could effectively reduce the charge transfer impedance of the material.

关 键 词：尖晶石 包覆改性 MNO2 循环性能 

分 类 号：O646[理学—物理化学]