Abstract

A novel and facile one-pot method, named high-temperature high-energy mechanical force (HTHEMF), was successfully used to synthesize the Fe₂P/LiFePO₄/C composites. In this method, the combination of the high-energy mechanical force with the high-temperature not only simplified the synthesis process, but also reduced the temperature and time of the calcinations process. The temperature and time were 600°C and 10 h, respectively. X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM) and electrochemical performance tests were employed to analyze the properties of the samples. The results suggested that Fe₂P phase has a favorable effect on improving the electrochemical performance of the LiFePO₄ material, such as high-rate capacity, low polarization phenomena and stable cycling performance. The composites delivered higher discharge capacities at different discharge rates, and it provided the first discharge capacities of 155 mA h g^–1 about 7.6% more than which of the LiFePO₄/C composites at 0.1 C. It indicated that the one-pot HTHEMF method is promising approaches to obtain the Fe₂P/LiFePO₄/C composites with good properties.

中文翻译：

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新型简便方法合成的Fe 2 P / LiFePO 4 / C复合材料的性能

摘要

一种新颖且简便的一锅法，即高温高能机械力（HTHEMF），已成功地用于合成Fe ₂ P / LiFePO ₄ / C复合材料。在这种方法中，高能机械力与高温的结合不仅简化了合成过程，而且减少了煅烧过程的温度和时间。温度和时间分别为600℃和10小时。用X射线衍射分析（XRD），扫描电子显微镜（SEM），高分辨率透射电子显微镜（HRTEM）和电化学性能测试来分析样品的性能。结果表明Fe ₂P相在提高LiFePO ₄材料的电化学性能方面具有良好的效果，例如高倍率容量，低极化现象和稳定的循环性能。复合材料在不同的放电速率下具有更高的放电容量，其第一放电容量为155 mA hg ^–1，比0.1 Fe时的LiFePO ₄ / C复合材料高出约7.6％。这表明单锅HTHEMF方法是获得具有良好性能的Fe ₂ P / LiFePO ₄ / C复合材料的有前途的方法。