LiFePO4: From molten ingot to nanoparticles with high-rate performance in Li-ion batteries
LiFePO4: From molten ingot to nanoparticles with high-rate performance in Li-ion batteries
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DOI：
10.1016/j.jpowsour.2010.07.010
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发表时间：
2010-12
影响因子：
9.2
通讯作者：
K. Zaghib;P. Charest;M. Dontigny;A. Guerfi;M. Lagacé;A. Mauger;M. Kopeć;C. Julien
中科院分区：
文献类型：
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作者：
K. Zaghib;P. Charest;M. Dontigny;A. Guerfi;M. Lagacé;A. Mauger;M. Kopeć;C. Julien
通过研磨在熔融状态下合成的锭获得LiFePO 4（LFP）颗粒。这个过程，随后是喷射研磨，然后湿磨，提供了一种简单的方法来获得具有从宏观到25 nm范围内的受控粒度的粉末。然而，在这个时候，我们发现这些颗粒倾向于聚集形成尺寸为100 nm的二次颗粒。通过该方法获得的颗粒通过X射线衍射（XRD）表征。原位和非原位扫描电子显微镜（SEM）和透射电子显微镜（TEM）。通过红外光谱（FTIR）和磁性测量的物理性能分析，也研究了研磨的效果。在含有Li/IM LiPF 6的EC：DEC（1：1）/C-LiFePO 4电池中评价电化学性能。在碳涂覆之后，不含杂质的LFP颗粒表现出高倍率性能。即使使用有限量的碳（2 wt.%）适用于商用电池，0.1C时容量为157 mAhg − 1，10 C时容量为120 mAhg − 1，60次循环后容量无衰减。
LiFePO4(LFP) particles were obtained by grinding ingot synthesized in the molten state. This process, followed by jet milling, and then wet milling, provides a simple way to obtain powders with controlled particle size in the range from macroscopic to 25nm. However, at this time, we find that these particles tend to agglomerate to form secondary particles of size ∼100nm. The particles obtained by this process are characterized by X-ray diffraction (XRD). In situ and ex situ scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The effect of milling was also investigated by analysis of physical properties using infrared spectroscopy (FTIR) and magnetic measurements. The electrochemical performance was evaluated in cells containing Li/1M LiPF6in EC:DEC (1:1)/C-LiFePO4. After carbon coating, the LFP particles which are free of impurities, exhibit high-rate capability. Even with a limited amount of carbon (2wt.%) appropriate for commercial batteries, the capacity is 157mAhg−1at 0.1C, 120mAhg−1at 10C, without capacity fading after 60 cycles.