作　　者： (张冬）; (李亭亭）; (邱海龙）; (魏英进）; (王春忠）; (陈岗）; (岳惠娟）;

机构地区： 吉林大学物理学院、新型电池物理与技术教育部重点实验室,长春130012

出　　处： 《高等学校化学学报》 2017年第9期1633-1638,共6页

摘　　要： 采用溶胶-凝胶法制备了氮掺杂的硅酸亚铁锂正极材料.通过X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)、充放电测试和交流阻抗测试(EIS)等对材料的结构及电化学性能进行了表征.结果表明,N元素已掺杂到Li_2FeSiO_4材料晶格中,样品具有较小的颗粒尺寸和优异的动力学性能,表现出较好的充放电比容量和倍率特性,首次放电比容量为130 mA·h/g,循环50次后比容量仍可达到124mA·h/g,容量保持率高达95%. N-doped lithium iron silicates（ N-doped Li_2FeSiO_4,N-LFs） was prepared with sol-gel method.X-Ray diffraction,field emission scanning electron microscopy,X-ray photoelectron spectroscopy,galvanostatic charge-discharge and electrochemical impedance spectra were used to investigate the effect of nitrogen doping on the characteristics of Li_2FeSiO_4. The results show that nitrogen does enter the cystal strucutre of Li_2FeSiO_4,resulting in smaller particle size and better kinetic properties,as well as higher specific capacity and rate capability. The doped sample could deliver a specific capacity of 130 mA·h/g in the first discharge and retain 124 mA·h/g after 50 cycles with the retention of 95%.

关 键 词： 锂离子电池 正极材料 硅酸亚铁锂 离子掺杂