| 水热法合成LiFePO4的掺碳改性研究 |
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| 引用本文： | 彭行圆,魏涛,张五星,黄云辉.水热法合成LiFePO4的掺碳改性研究[J].材料导报,2011,25(18):66-69. |
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| 作者姓名： | 彭行圆 魏涛 张五星 黄云辉 |
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| 作者单位： | 华中科技大学材料科学与工程学院材料成形与模具技术国家重点实验室,武汉,430074 |
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| 基金项目： | 国家自然科学基金(20803042) |
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| 摘 要： | 以LiOH、FeSO4和H3PO4为原料,采用水热法合成了结晶性良好的LiFePO4颗粒。在此基础上,以葡萄糖为碳源,掺入不同量的碳,形成LiFePO4/C复合材料。样品经过XRD、SEM、恒流充放电测试、EIS表征,结果表明,掺碳提高了LiFePO4的比容量、循环性能和锂离子的扩散动力学性能。电化学测试表明,LiFePO4/C放电比容量开始随着碳含量的增加而上升,随后降低。其中,3%碳含量的LiFePO4/C样品具有最佳的放电性能,0.1C倍率下达到145mAh/g,0.2C倍率下达到142mAh/g,50次循环后仅衰减0.7%。
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| 关 键 词： | 水热法 磷酸铁锂 包碳 |
Study on the Electrochemical Characteristics of Hydrothermally Prepared LiFePO_4 Followed by Carbon Coating |
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| PENG Xingyuan,WEI Tao,ZHANG Wuxing,HUANG Yunhui.Study on the Electrochemical Characteristics of Hydrothermally Prepared LiFePO_4 Followed by Carbon Coating[J].Materials Review,2011,25(18):66-69. |
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| Authors: | PENG Xingyuan WEI Tao ZHANG Wuxing HUANG Yunhui |
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| Affiliation: | PENG Xingyuan,WEI Tao,ZHANG Wuxing,HUANG Yunhui(State Key Laboratory of Material Processing and Die & Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074) |
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| Abstract: | The olivine-type LiFePO4/C cathode materials were prepared via hydrothermal reaction using LiOH,FeSO4 and H3PO4 as raw materials and different contents of glucose as the carbon source.The samples were characterized by X-ray powder diffraction(XRD),scanning electron microscopy(SEM),constant current charge-discharge cycling test and and electrochemical impedance spectroscopy(EIS).The results indicate that carbon adding improves the capacity,cycle stability and lithium ion diffusion kinetics of LiFePO4.Electro... |
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| Keywords: | hydrothermal reaction LiFePO4 carbon coating |
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