锂离子电池阴极材料Li0.99M0.01FePO4/C(M=In^3+,Al^3+)性能研究  

Properties of Li0.99M0.01FePO4/C(M=In^3+,Al^3+)cathode materials for lithium ion battery

作　　者：丁元生[1] 史晋宜[1] 张连中[1] DING Yuan-sheng;SHI Jin-yi;ZHANG Lian-zhong(Department of Chemical and Pharmaceutical Engineering,Jilin Institute of Chemical Technology,Jilin 132022,China)

机构地区：[1]吉林化工学院化学与制药工程学院,吉林吉林132022

出　　处：《应用化工》2020年第5期1208-1211,1214,共5页Applied Chemical Industry

基　　金：吉林省教育厅科学基金资助(2013320)。

摘　　要：采用湿法球磨辅助固相反应法制备了Li0.99M0.01FePO4/C(M=In3+,Al3+)复合材料,利用X射线衍射、扫描电镜、循环伏安法、循环实验和阻抗实验研究其物理电化学性能。结果表明,与Li0.99Al0.01FePO4/C复合材料相比,在高电流密度下,Li0.99In0.01FePO4/C在容量传递、循环性能和可逆性方面均表现出较好的电化学特性。这一改进归于掺杂了更大半径的阳离子到晶格中而引起的。此外,LiFePO4晶格中较大的离子可以在高速率循环过程中稳定晶体结构,降低电荷转移电阻。Li0.99 M0.01 FePO4/C(M=In3+,Al3+)composites were synthesized by the wet-milling solid-state method and their physical and electrochemical properties were investigated using X-Ray diffraction,Scanning electron microscopy,cyclic voltammetry,the cycling test and impedance test.The result showed that:in comparison with the Li 0.99 Al 0.01 FePO4/C composite,Li 0.99 In 0.01 FePO4/C exhibited better electrochemical characteristics in terms of its capacity delivery,cycle performance and reversibility,especially at a high current density.This improvement is ascribed to the extension of the pathways for Li-ion intercalation caused by doping the cation with a larger radius into the lattice.In addition,the larger ion in the LiFePO4 lattice can stabilize the crystal structure during high rate cycling and decrease the charge transfer resistance.

关 键 词：磷酸铁锂 锂离子电池 铟掺杂 

分 类 号：TQ152[化学工程—电化学工业] TM912[电气工程—电力电子与电力传动]