| 锂离子电池正极材料LiFePO_(3.99)F_(0.01)/C的结构与性能 |
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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LiFePO_(3.99)F_(0.01)/C的结构与性能[J].功能材料,2011,42(5). |
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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： | 龙云飞,王凡,杨克迪,文衍宣,LONG Yun-fei,WANG Fan,YANG Ke-di,WEN Yan-xuan(广西大学,化学化工学院,广西,南宁,530004);吕小艳,LV Xiao-yan(广西大学,教务处,广西,南宁,530004) |
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| 基金项目： | 国家自然科学基金，广西大型仪器协作网基金 |
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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LiFePO4-xFx/C复合正极材料,并用X射线衍射(XRD)、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F-掺杂和碳包覆对材料的结构和电化学性能的影响.研究表明,掺杂少量的F-可以减少电极极化、降低电荷转移电阻、增大Li+的扩散速率.其中LiFePO3.99F0.01/C的5C放电比容量为109.9mAh/g,50次循环后仍保持110.6mAh/g,表现出良好的倍率性能.
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| 关 键 词： | 锂离子电池 正极材料 |
Performance and structure of LiFePO_(3.99)F_(0.01)/C as cathode material for lithium ion battery |
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| LONG Yun-fei,WANG Fan,LV Xiao-yan,YANG Ke-di,WEN Yan-xuan.Performance and structure of LiFePO_(3.99)F_(0.01)/C as cathode material for lithium ion battery[J].Journal of Functional Materials,2011,42(5). |
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| Authors: | LONG Yun-fei WANG Fan LV Xiao-yan YANG Ke-di WEN Yan-xuan |
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| Affiliation: | LONG Yun-fei1,WANG Fan1,LV Xiao-yan2,YANG Ke-di1,WEN Yan-xuan1(1.School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,China,2.Educational Administration Department,China) |
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| Abstract: | LiFePO4 has been studied intensively as a potential cathode material for rechargeable Li-ion batteries.However,poor rate performance limits its commercial application.In our work,LiFePO4-xFx/C composite cathode materials were prepared by carbothermal reduction technology to improve its rate performance.The crystalline structure,morphology and electrochemical performances of the samples were characterized by X-ray diffraction(XRD),Fourier transfer infrared spectroscopy(FT-IR),charge-discharge experiments,cyc... |
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| Keywords: | LiFePO4 |
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