| 双相碳改性硅酸铁锂正极材料研究 |
| Study of Two-phase Carbon Modified Li2FeSiO4as Cathode Material |
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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(170.3 mAh 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: |
| 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 5 wt% 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：2013-10-08 |
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