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aaa_dujiang金蟲 (正式寫手)
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[求助]
一段鋰電池材料英文摘要翻譯，謝謝
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里面有些專業(yè)詞匯不太懂 謝謝了 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
金蟲 (小有名氣)
- 翻譯EPI: 8
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【答案】應助回帖
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愛與雨下: 金幣+2 2012-07-08 21:23:33
sltmac: 金幣+5, 翻譯EPI+1 2012-08-04 13:16:29
愛與雨下: 金幣+2 2012-07-08 21:23:33
sltmac: 金幣+5, 翻譯EPI+1 2012-08-04 13:16:29
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太長了，超時了10分鐘，去干活了~ 磷酸鐵鋰表面的碳包覆層對電極的電化學性能具有十分重要的作用。本課題使用蔗糖作為碳 源，研究了碳包覆對超臨界水熱法(SHS)和傳統(tǒng)固相法(SS)制備的磷酸鐵鋰顆粒的影響。對碳包覆磷酸鐵鋰的碳含量、結(jié)構(gòu)、形貌、電導和電化學性能隨包覆條件（蔗糖濃度、預燒溫度和預燒時間）的變化進行了表征。和SS方法相比（顆粒粒徑3-15um，比表面積2.4m2/g），使用SHS方法制備的磷酸鐵鋰顆粒具有較小的粒徑（0.4-1um），較大的比表面積（7.3m2/g）和較低的顆粒團聚度。這兩種方法制備的磷酸鐵鋰在顆粒粒徑和形貌上的不同給碳包覆的連續(xù)性、碳層的結(jié)構(gòu)及電導性能來來較大的差異。使用SS方法制備的LFP顆粒表面的碳包覆層更均一，碳含量也更高。這使得其具有更高的請充放電容量（147mA·h/g）和更大的電流密度17mA/g(0.1C)，高于SHS方法（135mA/g）。實驗沒有觀察到明顯的容量衰減現(xiàn)象。當碳包覆含量為6w%時，在1700mA/g(10C)的放電電流下，兩種方法制備的C-LFP顆粒的放電容量分別達到理論值的55%和52%。隨碳含量的變化，兩種方法制備的C-LFP的放電容量呈現(xiàn)相似的變化趨勢。當碳包覆的含量增加到6w%時，放電容量增加；但當進一步升高碳含量至10w%時，放電容量反而降低。因此，碳含量和顆粒的性質(zhì)對于C-LFP的電化學性能至關(guān)重要，需嚴格控制。 |
2樓2012-07-07 13:41:46
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