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aaa_dujiang金虫 (正式写手)
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[求助]
一段锂电池材料英文摘要翻译，谢谢
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里面有些专业词汇不太懂 谢谢了 Carbon coating on lithium iron phosphate (LiFePO4) plays a crucial role in determining its electrochemical performance. This study investigates the effect of carbon coating on lithiumironphosphate particles synthesized using a continuous supercritical hydrothermal synthesis (SHS) method and a conventional solid-state (SS) method, with sucrose as a carbon precursor. The carbon content, carbon structure, morphology, electronic conductivity, and electrochemical performance of the carbon-coated LiFePO4 (C-LiFePO4) are characterized as a function of the following coating conditions: sucrose concentration, calcination temperature, and calcination time. The particles produced using supercritical water have a smaller size (400–1000 nm), larger BET surface area of 7.3 m2/g, and lower degree of particle aggregation compared with those produced via solid-state synthesis (particle size: 3–15 μm; BET surface area: 2.4 m2/g). The differences in the particle size and particle morphology of the LiFePO4 prepared using the two synthetic methods cause a significant difference in the uniformity of the carbon coating, carbon structure, and electronic conductivity. A more uniform carbon layer coating and greater amount of graphitic carbon are found in the LiFePO4 particles produced via the SS method. This leads to a higher discharge capacity of 147 mA h/g at a current density of 17 mA/g (0.1 C) after 30 cycles when compared with the C-LiFePO4 produced by the SHS method (135 mA h/g). No obvious capacity fading was observed. At a high current of 1700 mA/g (10 C), the delivered capacities of the C-LiFePO4 particles produced via the SS and the SHS methods are 55% and 52% of the theoretical value, respectively, at a carbon content of 6 wt.%. The carbon-coated samples prepared using the SHS and SS methods exhibit similar discharge capacity trends for the carbon content. As the carbon content increased to 6 wt.%, the discharge capacity increased, while a further increase in the carbon content to 10 wt.% resulted in a decrease in the discharge capacity. Thus, the carbon content and particle properties need to be carefully optimized to enhance the electrochemical performance of C-LiFePO4 |
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yufenfei3002
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爱与雨下: 金币+2 2012-07-08 21:23:33
sltmac: 金币+5, 翻译EPI+1 2012-08-04 13:16:29
爱与雨下: 金币+2 2012-07-08 21:23:33
sltmac: 金币+5, 翻译EPI+1 2012-08-04 13:16:29
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太长了，超时了10分钟，去干活了~ 磷酸铁锂表面的碳包覆层对电极的电化学性能具有十分重要的作用。本课题使用蔗糖作为碳 源，研究了碳包覆对超临界水热法(SHS)和传统固相法(SS)制备的磷酸铁锂颗粒的影响。对碳包覆磷酸铁锂的碳含量、结构、形貌、电导和电化学性能随包覆条件（蔗糖浓度、预烧温度和预烧时间）的变化进行了表征。和SS方法相比（颗粒粒径3-15um，比表面积2.4m2/g），使用SHS方法制备的磷酸铁锂颗粒具有较小的粒径（0.4-1um），较大的比表面积（7.3m2/g）和较低的颗粒团聚度。这两种方法制备的磷酸铁锂在颗粒粒径和形貌上的不同给碳包覆的连续性、碳层的结构及电导性能来来较大的差异。使用SS方法制备的LFP颗粒表面的碳包覆层更均一，碳含量也更高。这使得其具有更高的请充放电容量（147mA·h/g）和更大的电流密度17mA/g(0.1C)，高于SHS方法（135mA/g）。实验没有观察到明显的容量衰减现象。当碳包覆含量为6w%时，在1700mA/g(10C)的放电电流下，两种方法制备的C-LFP颗粒的放电容量分别达到理论值的55%和52%。随碳含量的变化，两种方法制备的C-LFP的放电容量呈现相似的变化趋势。当碳包覆的含量增加到6w%时，放电容量增加；但当进一步升高碳含量至10w%时，放电容量反而降低。因此，碳含量和颗粒的性质对于C-LFP的电化学性能至关重要，需严格控制。 |
2楼2012-07-07 13:41:46
