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喲喲william木蟲 (小有名氣)
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[求助]
小段英文翻譯，求助。各路大神速來呀！��！
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To understand the reason for the superior electrochemical performance of the sulfur–carbon composite synthesized by the in situ sulfur-deposition route, EIS measurements were carried out with the coin cells. The Nyquist profiles of the pure sulfur and sulfur–carbon composite cathodes and the equivalent circuits are shown in Fig. 8. Re refers to the resistance of electrolyte, Rct refers to the charge transfer resistance between the interfaces of carbon/ sulfur/electrolyte, Wo refers to the Warburg impedance, and CPE refers to the constant phase element [23]. The resistance of electrolyte was estimated from the intersection of the front end of semicircles with the Z axis, which is similar for both the cathodes. The diameter of the impedance semicircles is related to the charge transfer resistance, which is a measure of the difficulty involved for charges crossing the boundary between the electrode and electrolyte. Before cycling, the sulfur–carbon composite cathode has a slightly lower charge transfer resistance value than the pure sulfur cathode, which is expected considering its higher first discharge capacity compared to that of the pure sulfur cathode. The close contact between the conductive carbon black and the insulating sulfur lowers the resistance for electrons transferring across the interface between them. In the subsequent cycles (1st, 25th, and 50th), the charge-transfer resistance of the pure sulfur cathode grows much larger than that found with the sulfur–carbon composite cathode. The main reason for this is the porous structure of the cycled pure sulfur cathode. Electrons passing across the boundary between conductive carbon and active material are impeded by the irreversible formation of the Li2S layer in the pores [10]. The EIS measurements thus reveal that the sulfur–carbon composite cathode exhibits better electronic conductivity and lithium-ion transport than the pure sulfur cathode due to the stable network structure of carbon black wrapping around the sulfur. The impedance of the sulfur–carbon composite after 50th cycles does not increase much, suggesting that the network structure maintains its integrity during the cycling process. |
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南京工大
木蟲 (小有名氣)
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【答案】應(yīng)助回帖
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喲喲william: 金幣+10, 翻譯EPI+1, ★有幫助 2013-04-26 22:42:55
喲喲william: 金幣+10, 翻譯EPI+1, ★有幫助 2013-04-26 22:42:55
| 為了更好的理解通過原位硫沉積法制備的硫-碳復(fù)合物電極具有良好電化學(xué)性能的原因，我們使用扣式電池進(jìn)行了電化學(xué)阻抗譜的測(cè)試。圖8中所表示的是純的硫，硫碳復(fù)合物電極，以及對(duì)應(yīng)電路的尼奎斯特圖像。其中，Re代表電池液的電阻，Rct代表碳/硫/電池液界面間電荷轉(zhuǎn)移的阻力，Wo代表瓦爾堡阻抗，CPE代表常相角元件。電池液以及陰極的電阻通過圖線中半圓形曲線的前端與Z軸的交點(diǎn)確定。阻抗曲線的直徑與電荷轉(zhuǎn)移的阻力相關(guān)，通過該值可以測(cè)定電荷穿越電極和電池液界面的難易。在循環(huán)前，硫碳復(fù)合物電極的電荷傳遞阻力值略小于單純硫電極，考慮到它與單純硫電極相比較高的首次放電能力，這一點(diǎn)是可以理解的。導(dǎo)電炭黑與絕緣體硫的緊密接觸減小了兩者界面上電子傳遞的阻力。在后面的循環(huán)中（第一次，第25次，第50 次），單純硫電極的電荷傳遞阻力增大程度要遠(yuǎn)大于硫碳復(fù)合物電極。單純硫電極的多孔結(jié)構(gòu)導(dǎo)致了這一現(xiàn)象的出現(xiàn)。電子在穿過導(dǎo)體碳和活性材料之間的界面時(shí)，被孔中不可逆生成的Li2S層阻礙。電化學(xué)阻抗譜的測(cè)試結(jié)果顯示，硫碳復(fù)合物電極中，炭黑包裹在硫的表面生成穩(wěn)定的網(wǎng)絡(luò)結(jié)構(gòu)，使其與單純硫電極相比具有更好的電子傳導(dǎo)性能以及鋰離子傳輸性能。硫碳電極在50次循環(huán)后，阻抗并沒有明顯的增加，顯示了其網(wǎng)絡(luò)結(jié)構(gòu)在循環(huán)過程中保持了很好的完整性。 |
7樓2013-04-26 22:40:46
ruiyuan121
木蟲 (著名寫手)
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喲喲william2樓2013-04-26 22:04:33
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木蟲 (小有名氣)
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3樓2013-04-26 22:05:21
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