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LiFeO_2包覆锂离子正极材料Li[Li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2制备及性能表征

Synthesis and performance characterization of LiFeO_2 coating Li-[Li_(0.2)Mn_(0.54)Ni_(0.13)Co_(0.13)]O_2 cathode materials for lithium-ion batteries
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摘要 采用溶胶-凝胶工艺在Li[Li0.2Mn0.54Ni0.13Co0.13]O2表面包覆LiFeO2,并用扫描电镜(SEM),X-射线衍射(XRD),EIS和恒电流充放电等方法研究了不同包覆量的LiFeO2包覆对Li[Li0.2Mn0.54Ni0.13Co0.13]O2结构和电化学性能的影响。XRD、SEM实验数据表明,该材料具有层状α-NaFeO2结构,包覆后材料结构没有变化,表面覆盖上一层纳米级别的颗粒。电化学性能测试结果表明,质量分数1%LiFeO2包覆能显著改善Li[Li0.2Mn0.54Ni0.13Co0.13]O2材料在高截止电压(4.8 V)下的循环性能和倍率性能,EIS研究结果显示其界面阻抗明显减小,电子电导率得到提高,从而提高电化学性能。 LiFeO2 coating Li[Li0.2Mn0.54Ni0.13Co0.13]O2 was prepared by sol-gel process. The effect of LiFeO2 coating quantity on the structure and electrochemical performance of Li[Li0.2Mn0.54Ni0.13Co0.13]O2 was characterized by scanning electron microscope（SEM）, X-ray diffraction（XRD）, electrochemical impedance spectroscopy（EIS） and galvanostatic charge-discharge tests. The XRD and SEM electrochemical data show that coated material structure does not change with α- NaFeO2 layered structure, the surface covered with a layer of nanometer-scale particles. Electrochemical tests suggest that the cycle performance and rate capability of lwt% LiFeO2-coated Li[Li0.2Mn0.54Ni0.13Co0.13]O2 can be greatly improved under a high cutoff voltage range of 4.8 V; EIS results confirm that interfacial impedance is significantly reduced, and the electronic conductivity is improved, thereby enhancing the electrochemical performance.
作者 陈佚 吴伯荣 赵章宏 陶丹 李佳
机构地区 北京理工大学化工与环境学院环境科学与工程北京市重点实验室 高平唐一新能源科技有限公司
出处 《电源技术》 CAS CSCD 北大核心 2014年第6期1018-1021,共4页 Chinese Journal of Power Sources
关键词 锂离子电池 LiFeO2 Li[Li0 2Mn0 54Ni0 13Co0 13]O2 包覆 lithium-ion battery Li[Li0.2Mn0.54Ni0.13Co0.13]O2 coating
分类号 TM912.9 [电气工程—电力电子与电力传动]
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参考文献13

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共引文献6

电源技术
2014年 第6期

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