固相法制备LiMnO2材料最佳温度的探究  

Research on the Optimum Temperature of LiMnO Prepared by Solid Phase Method

作　　者：李浩[1] Li Hao(University of Electronic Science and Technology of China,Chengdu Sichuan,610054)

机构地区：[1]电子科技大学,四川成都610054

出　　处：《电子测试》2020年第16期34-35,共2页Electronic Test

摘　　要：层状LiMnO2正极材料由于其高理论比容量(285 mAh g-1)、高能量密度、低成本引起了学者们的广泛注意。为了能制备出稳定的层状LiMnO2正极材料,并获得优良的循环性能,本文通过改进的高温固相法制备出了稳定的层状LiMnO2正极材料采用了XRD和电化学测试等手段对材料的晶体结构组成,电化学性能进行了测试表征,研究结果如下:本文成功合成了具有层状结构的LiMnO2正极材料。对其不同温度下合成的材料进行XRD测试以及电化学性能测试,发现不同温度下制备的LiMnO2正极材料均出现一定程度的团聚,且颗粒粒径分布不均匀;在0.1C放电倍率下,750℃下制备得到的LiMnO2正极材料具有最高的放电比容量(131 mAh g-1),经过60次循环后,材料放电比容量为100 mAh g-1,容量保持率为76.3%。The layered LiMnO2 cathode material has attracted extensive attention from scholars due to its high theoretical specific capacity(285 mAh g-1).In order to prepare a stable layered LiMnO2 cathode material and obtain excellent cycle performance,this paper prepared a stable layered LiMnO2 cathode material by an improved high-temperature solid phase method using XRD and electrochemical testing methods to crystallize the material The structural composition and electrochemical properties were tested and characterized.The research results are as follows:LiMnO2 cathode material with layered structure was successfully synthesized.The XRD and electrochemical performance test of the materials synthesized at different temperatures found that the LiMnO2 cathode materials prepared at different temperatures all showed a certain degree of agglomeration and uneven particle size distribution;at 0.1C discharge rate,The LiMnO2 cathode material prepared at 750℃has the highest discharge specific capacity(131 mAh g-1).After 60 cycles,the material discharge specific capacity is 100 mAh g-1 and the capacity retention rate is 76.3%.

关 键 词：LiMnO2材料 固相法 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]