无机化学学报

聚阴离子掺杂LiMnO_2-yX_y(X=BF₄^-，SiO₃^2-，MoO₄^2-，PO₄^3-，BO₃^3-)材料的合成及其电化学性能

Synthesis and Electrochemical Properties of Polyanion Doped LiMnO_2-yX_y(X=BF₄^-, SiO₃^2-, MoO₄^2-, PO₄^3-, BO₃^3-)

作者	单位
粟智	新疆师范大学生命科学与化学学院，乌鲁木齐 830054
叶世海	南开大学化学学院，新能源材料化学研究所，天津 300071
王永龙	南开大学化学学院，新能源材料化学研究所，天津 300071

摘要: 采用水热法合成了聚阴离子掺杂LiMnO_2-yX_y(X=BF₄^-，SiO₃^2-，MoO₄^2-，PO₄^3-，BO₃^3-，y=0.01、0.03、0.05)锂离子电池正极材料。通过X射线粉末衍射(XRD)、X光电子能谱(XPS)、扫描电镜(SEM)和恒电流充放实验，研究了不同掺杂离子和掺杂量对产物结构和电化学性能的影响。结果表明，少量聚阴离子的掺杂未改变正交LiMnO₂的晶体类型，但增大了材料晶胞体积，改善了材料的电化学循环性能。电化学交流阻抗(EIS)测试结果表明，聚阴离子掺杂增大了材料电荷转移阻抗，但明显提高了材料中Li⁺的扩散能力。

关键词: 聚阴离子掺杂锂离子电池层状LiMnO₂ 电化学性能

基金项目:

Abstract: Hydrothermal methods were used to prepare the polyanion-doping LiMnO_2-yX_y(X=BF₄^-, SiO₃^2-, MoO₄^2-, PO₄^3-, BO₃^3-) as cathode materials for lithium-ion batteries. The samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), scanning electron microscope (SEM) and their electrochemical performances were investigated including cycling behavior (CV) and constant current charge-discharge experiment. The results indicate that the low concent ration polyanion dopant does not affect the crystal type of orthorhombic LiMnO₂ but considerable improves its electrochemical performances. Electrochemical impedance spectroscopy (EIS) analysis shows that the charge-tranfer resitance and the Warburg impendance decrease obviously as compared to that the undoped LiMnO₂ samples, however, The large polyanion doping can enhances fast mobility of Li⁺ ions.

Keywords: polyanion doping lithium-ion batteries orthorhombic structure electrochemical properties

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粟智,叶世海,王永龙.聚阴离子掺杂LiMnO_2-yX_y(X=BF₄^-，SiO₃^2-，MoO₄^2-，PO₄^3-，BO₃^3-)材料的合成及其电化学性能[J].无机化学学报,2010,26(4):693-700.

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