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首页> 外文期刊>Advanced Functional Materials >High-rate LiFePO4 electrode material synthesized by a novel route from FePO4 center dot 4H(2)O
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High-rate LiFePO4 electrode material synthesized by a novel route from FePO4 center dot 4H(2)O

机译：由FePO4中心点4H（2）O通过新颖途径合成的高速率LiFePO4电极材料

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摘要

A LiFePO4 material with ordered olivine structure is synthesized from amorphous FePO4 center dot 4H(2)O through a solid-liquid phase reaction agent, followed by thermal conversions of the intermediate NH4FEPO4 in the presence of LiOOCH3 center dot 2H(2)O. Simultaneous thermagravimetric-differential thermal analysis indicates that the crystallization mainly in the range 100-300 nm is observed by using by using scanning electron microscopy of the resulting LiFePO4 powder with a particle size mainly in the range 100-300 nm is observed by using scanning electron microscopy. As an electrode material for rechargeable lithium batteries, the LiFePO4 sample delivers a discharge capacity of 167 mA h g(-1) at constant current of 17 mA g(-1) (0.1 C rate throughout this study nC rate means that rated capacity of LiFePO4 (170 mA h g(-1)) is charged or discharged completely in 1 hour), approaching the theoretical value of 170 mA h g(-1). Moreover, the electrode shows excellent high-rate charge and discharge capability and high-rate charge under 5 C and 10 C rate conditions. With a conventional charge mode, that is, 5 C rate charging to 4.2 V and then keeping this voltage until the charge current is decreased to 0.1 C rate, a discharge capacity of ca. 134 mA h g(-1) and cycling efficiency of 99.2-99.6% can be obtained at 5 C rate.
机译：由无定形的FePO4中心点4H（2）O通过固-液相反应剂合成具有有序橄榄石结构的LiFePO4材料，然后在LiOOCH3中心点2H（2）O存在下将中间体NH4FEPO4热转化。同时的热重差热分析表明，通过使用扫描电子显微镜观察，主要在100-300nm范围内观察到结晶，通过使用扫描电子观察到所得的LiFePO4粉末的粒径主要在100-300nm范围内。显微镜检查。作为可充电锂电池的电极材料，LiFePO4样品在17 mA g（-1）的恒定电流下可提供167 mA hg（-1）的放电容量（整个研究中的0.1 C速率nC速率表示LiFePO4的额定容量（170 mA hg（-1））在1 / n小时内完全充电或放电），接近170 mA hg（-1）的理论值。而且，该电极在5 C和10 C速率条件下显示出优异的高速率充电和放电能力以及高速率充电。在传统的充电模式下，即以5 C的速率充电至4.2 V，然后保持该电压直到充电电流降低至0.1 C的速率，放电容量约为。在5 C速率下可获得134 mA h g（-1）和99.2-99.6％的循环效率。

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