| 双相碳改性硅酸铁锂正极材料研究 | |
| Research on Two-Phase Carbon Modified Li2FeSiO4 as Cathode Material | |
| 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。 | |
| 关键词: 正极材料 硅酸铁锂 活化石墨 电化学性能 | |
| 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）；三峡大学人才科研启动基金（No.KJ2012B043）资助项目。 | |
| 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. | |
| Keywords: cathode material lithium iron silicate activated graphite electrochemical performance | |
| 投稿时间：2013-07-20 修订日期：2013-09-30 | |
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| 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,2014,30(2):345-352. | |
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