| 锂离子电池正极材料LiFePO4的复合改性研究 |
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| 引用本文： | 王婷,赵双群,江涌,刘红飞. 锂离子电池正极材料LiFePO4的复合改性研究[J]. 电源技术, 2010, 34(3) |
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| 作者姓名： | 王婷 赵双群 江涌 刘红飞 |
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| 作者单位： | 宁夏职业技术学院,机电工程系,宁夏,银川,750021;宁夏大学,物理电气信息学院,宁夏,银川,750021;宁夏大学,物理电气信息学院,宁夏,银川,750021;北方民族大学,材料科学与工程学院,宁夏,银川,750021 |
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| 基金项目： | 国家民委粉体材料与特种陶瓷重点实验室开放基金资助项目;;2008年宁夏高等学校科研项目资助 |
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| 摘 要： | 为了提高LiFePO4的充放电性能,通过高温固相法合成了Li0.98M0.02FePO4/C(M=Cr、W)及Li1.03M0.02Fe0.98PO4/C(M=Zr、Ni)两类橄榄石型正极材料。运用X射线衍射光谱法(XRD)、扫描电子显微镜法(SEM)、能量散射X射线谱(EDX)和电化学测试对合成产物的晶体结构、颗粒形貌和电化学性能进行了表征。结果表明:Li0.98Cr0.02FePO4/C的放电比容量最高达到157.3mAh/g,且多次循环后容量几乎无衰减;在大电流充放电倍率下,材料依然能保持优良的循环性能,Li0.98W0.02FePO4/C首次放电比容量可达130.2mAh/g,10次循环后容量保持率为97%。离子掺杂和碳包覆改性能有效地提高LiFePO4的比容量和循环性能。
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| 关 键 词： | 锂离子电池 正极材料 LiFePO4 复合改性 |
Composite modification of LiFePO4 as cathode material of lithium ion battery |
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| WANG Ting,ZHAO Shuang-qun,JIANG Yong,LIU Hong-fei. Composite modification of LiFePO4 as cathode material of lithium ion battery[J]. Chinese Journal of Power Sources, 2010, 34(3) |
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| Authors: | WANG Ting ZHAO Shuang-qun JIANG Yong LIU Hong-fei |
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| Affiliation: | 1.Department of Mechanical and Engineering;Vocational and Technical College of Ningxia;Yinchuan Ningxia 750021;China;2.School of Physics and Electrical Information Engineering;Ningxia University;3.School of Materials Science and Engineering;Northern University of Nationalities;China |
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| Abstract: | In order to improve the electrochemical performance of LiFePO4,Li0.98M0.02FePO4/C (M=Cr,W)and Li1.03M0.02Fe0.98PO4/C (M=Zr,Ni)were prepared by solid state reaction method.The structure,morphology and electrochemical performance of composite cathode materials were characterized by XRD,SEM,EDX and charge-discharge tests.The results show that the maximum discharge capacities of Li0.98Cr0.02FePO4/C can reach 157.3 mAh/g and the capacity does not fade after several cycles.,the cycling performance of the material... |
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| Keywords: | lithium ion battery cathode materials LiFePO4 composite modification |
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