| 锂离子电池正极材料Li0.99Na0.01FePO4/C的结构与电化学性能 |
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| 引用本文： | 龙云飞,王凡,吕小艳,杨克迪,文衍宣.锂离子电池正极材料Li0.99Na0.01FePO4/C的结构与电化学性能[J].无机材料学报,2011(6):625-630. |
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| 作者姓名： | 龙云飞 王凡 吕小艳 杨克迪 文衍宣 |
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| 作者单位： | 广西大学化学化工学院;广西大学教务处; |
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| 基金项目： | 国家自然科学基金(50474092); 广西省自然科学基金(2011GXNSFA018015)~~ |
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| 摘 要： | 为了提高LiFePO4的倍率性能,用碳热还原法制备了Na+掺杂的LiFePO4/C复合正极材料,并用X射线衍射(XRD)、扫描电子显微镜(SEM)、红外光谱(FT-IR)、恒电流充放电技术、循环伏安(CV)和交流阻抗(EIS)研究了Na+掺杂对LiFePO4/C材料的结构、微观形貌和电化学性能的影响.结果表明,Na+掺杂的LiFePO4/C复合材料具有单一的橄榄石型晶体结构,不存在杂质衍射峰,Na+在Li位掺杂可提高材料的导电性能和Li+扩散速率,降低电极极化,能有效改善材料的循环性能和倍率性能.与LiFePO4/C相比,Li0.99Na0.01FePO4/C的0.5C、2C和5C放电比容量分别为147.6、126.4和105.1 mAh/g,并表现出良好的循环性能和倍率性能.
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| 关 键 词： | 锂离子电池 正极材料 LiFePO4 |
Electrochemical Characterizations and Structure of Li_(0.99)Na_(0.01)FePO_4/C as Cathode Material for Li-ion Battery |
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| LONG Yun-Fei,WANG Fan,Lü Xiao-Yan,YANG Ke-Di,WEN Yan-Xuan.Electrochemical Characterizations and Structure of Li_(0.99)Na_(0.01)FePO_4/C as Cathode Material for Li-ion Battery[J].Journal of Inorganic Materials,2011(6):625-630. |
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| Authors: | LONG Yun-Fei WANG Fan Lü Xiao-Yan YANG Ke-Di WEN Yan-Xuan |
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| Affiliation: | LONG Yun-Fei1,WANG Fan1,Lü Xiao-Yan2,YANG Ke-Di1,WEN Yan-Xuan1(1.School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,China,2.Educational Administra-tion Department,China) |
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| Abstract: | In order to improve the rate performance of lithium iron phosphate,Na+ doped LiFePO4/C cathode ma-terials were prepared by carbothermal reduction technology.Samples were characterized by X-ray diffraction(XRD),scanning electron microscope(SEM),Fourier transfer infrared spectroscopy(FT-IR),cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS).Their electrochemical performances were investigated by galvanostatic charge/discharge in terms of cycling performance and rate capability.The results ... |
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| Keywords: | lithium ion battery cathode material LiFePO4 |
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