| 双相碳改性硅酸铁锂正极材料研究 |
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| 引用本文： | 段松,张露露,杨学林,彭刚,黄云辉,覃磊,李明,倪世兵.双相碳改性硅酸铁锂正极材料研究[J].无机化学学报,2013,29(18). |
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| 作者姓名： | 段松 张露露 杨学林 彭刚 黄云辉 覃磊 李明 倪世兵 |
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| 作者单位： | 三峡大学机械与材料学院, 宜昌 443002;三峡大学机械与材料学院, 宜昌 443002;三峡大学机械与材料学院, 宜昌 443002;三峡大学机械与材料学院, 宜昌 443002;华中科技大学材料科学与工程学院, 武汉 430074;三峡大学机械与材料学院, 宜昌 443002;三峡大学机械与材料学院, 宜昌 443002;三峡大学机械与材料学院, 宜昌 443002 |
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| 基金项目： | 国家自然科学基金（No.51302153、51302152、51272128）；湖北省教育厅重点（No.D20131303）；湖北省杰出青年基金（No.2011CDA093）；宜昌市科学技术研究与开发项目（No.A2011-302-8）和三峡大学人才科研启动基金（No.KJ2012B043）资助项目。 |
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| 摘 要： | 以活化的天然石墨为碳源，采用固相辅助回流法成功合成了双相碳改性的Li2FeSiO4复合材料。采用XRD、SEM、HRTEM和Raman光谱分析了Li2FeSiO4/(C+G)复合材料的物相、形貌及其微观结构；并研究了活化石墨用量对Li2FeSiO4/(C+G)复合材料的电化学性能的影响。结果表明：活化石墨以石墨微晶和无定形碳的形态共存于Li2FeSiO4/(C+G)材料中，活化石墨用量为5%时所得样品的首次放电容量较高(170.3mAh·g-1)，循环50次后其容量保持率为88.7%，表现出了良好的电化学性能。
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| 关 键 词： | 正极材料 硅酸铁锂 活化石墨 电化学性能 |
Research on Two-Phase Carbon Modified Li2FeSiO4 as Cathode Material |
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| DUAN Song,ZHANG Lu-Lu,YANG Xue-Lin,PENG Gang,HUANG Yun-Hui,QIN Lei,LI Ming and NI Shi-Bing.Research on Two-Phase Carbon Modified Li2FeSiO4 as Cathode Material[J].Chinese Journal of Inorganic Chemistry,2013,29(18). |
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| Authors: | DUAN Song ZHANG Lu-Lu YANG Xue-Lin PENG Gang HUANG Yun-Hui QIN Lei LI Ming and NI Shi-Bing |
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| Institution: | College of Mechanical and Material Engineering, Three Gorges University, Yichang, Hubei 443002, China;College of Mechanical and Material Engineering, Three Gorges University, Yichang, Hubei 443002, China;College of Mechanical and Material Engineering, Three Gorges University, Yichang, Hubei 443002, China;College of Mechanical and Material Engineering, Three Gorges University, Yichang, Hubei 443002, China;School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;College of Mechanical and Material Engineering, Three Gorges University, Yichang, Hubei 443002, China;College of Mechanical and Material Engineering, Three Gorges University, Yichang, Hubei 443002, China;College of Mechanical and Material Engineering, Three Gorges University, Yichang, Hubei 443002, China |
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| Abstract: | Two-phase carbon modified Li2FeSiO4 composites (Li2FeSiO4/(C+G)) were synthesized via solid-state reaction assisted with refluxing. Activated natural graphite was chosen as carbon source. The phase and the microstructure of Li2FeSiO4/(C+G) were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM) and Raman spectrometry (Raman). The effect of activated graphite content on the electrochemical performance of Li2FeSiO4/(C+G) was also investigated. The results show that activated graphite exists in Li2FeSiO4/(C+G) samples in the form of amorphous carbon as well as graphite crystallite. Li2FeSiO4/(C+G) composite prepared with 5wt% activated graphite achieved the excellent electrochemical performance with a higher initial discharge capacity of 170.3 mAh·g-1 and with a capacity retention ratio of 88.7% after 50 cycles. |
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| Keywords: | cathode material lithium iron silicate activated graphite electrochemical performance |
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