稀土La掺杂对层状富锂锰基氧化物正极材料结构及电化学性能的影响  

Effect of La doping on the structure and electrochemical properties of layered Li-rich Mn-based oxide cathode materials

作　　者：罗林山[1] 刘雯雯[1] 文小强[1] 张帆 周新华[1] 郭春平[1] 周有池 普建[1] LUO Linshan;LIU Wenwen;WEN Xiaoqiang;ZHANG Fan;ZHOU Xinhua;GUO Chunping;ZHOU Youchi;PU Jian(Ganzhou Nonferrous Metallurgy Research Institute,Ganzhou 341000,China)

机构地区：[1]赣州有色冶金研究所

出　　处：《有色金属科学与工程》2019年第3期104-110,共7页Nonferrous Metals Science and Engineering

基　　金：赣州市科技计划项目(赣市财教字[2017]179号);赣州市科技计划项目(赣市科发[2018]50号)

摘　　要：采用碳酸盐共沉淀-高温烧结法制备了La掺杂层状富锂锰基氧化物正极材料Li1.2Mn0.54-xNi0.13Co0.13LaxO2(x=0,0.01,0.03,0.05),考察了La掺杂量对正极材料的结构及电化学性能的影响.采用X射线衍射(XRD)和扫描电镜(SEM)分析研究了正极材料的结构和形貌特征,材料的电化学性能采用交流阻抗和充放电测试仪进行测试分析.研究结果表明:所有样品均保持层状α-NaFeO2结构,随着La掺杂量的增加,样品形貌未发生明显变化,样品放电容量呈现先增大后降低的趋势,当La掺杂量为0.03时,具有最高的放电比容量285.3mAh/g(0.1C),经过50次循环后的放电比容量为260.5mAh/g,容量保持率为91.3%.La doping Li1.2Mn0.54-xNi0.13Co0.13LaxO2(x=0,0.01,0.03,0.05)layered Li-rich Mn-based oxide cathode materials were prepared by carbonate coprecipitation-high temperature sintering method.The effect of La doping on the structure and electrochemical properties of cathode materials was investigated.The structures and morphologies of cathode materials were analyzed by the X-ray diffraction(XRD)and scanning electron microscopy(SEM),electrochemical properties of materials were tested by AC Impedance and Charge and Discharge Tester.The results show that layeredα-NaFeO2 structure is maintained in all samples,and the morphology of samples does not change obviously with the increase of La doping amount.However,the discharge capacity of samples increases first and then decreases.They obtain the highest discharge specific capacity of 285.3 mAh/g(0.1 C)when the doping amount of La is 0.03.The specific discharge capacity is 260.5 mAh/g after 50 cycles and the capacity retention ratio is 91.3%.

关 键 词：富锂正极 LA掺杂 充放电 

分 类 号：TF125.24[冶金工程—粉末冶金] TF146.45[冶金工程—冶金物理化学]