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喲喲william木蟲 (小有名氣)
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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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ruiyuan121
木蟲 (著名寫手)
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【答案】應(yīng)助回帖
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喲喲william: 金幣+40, ★★★★★最佳答案, 金幣給你吧，呵呵，這么晚還幫我翻譯，真是感謝你 2013-04-26 23:28:00
喲喲william: 金幣+40, ★★★★★最佳答案, 金幣給你吧，呵呵，這么晚還幫我翻譯，真是感謝你 2013-04-26 23:28:00
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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. 通過對(duì)紐扣電池進(jìn)行電化學(xué)阻抗分析，來了解原位硫沉積法合成的碳硫復(fù)合物為什么具有良好的電化學(xué)特性。 The Nyquist profiles of the pure sulfur and sulfur–carbon composite cathodes and the equivalent circuits are shown in Fig. 8. 純硫陰極電極和碳硫復(fù)合陰極電極的 Nyquist剖面和等效電路如圖8所示。 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]. 其中，Re代表電解液的電阻，Rct代表碳/硫/電解液界面間電荷轉(zhuǎn)移電阻，Wo代表瓦爾堡阻抗，CPE代表常相位角元件。 The resistance of electrolyte was estimated from the intersection of the front end ofsemicircles with the Z axis, which is similar for both the cathodes.與陰極電阻計(jì)算方法相似，電解液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。 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.阻抗曲線的直徑與電荷轉(zhuǎn)移電阻有關(guān)，通過該值可以斷定電荷穿越電極和電池液界面的難易程度。 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. 循環(huán)前，硫碳復(fù)合電極的電荷轉(zhuǎn)移阻力值略小于純硫電極，這是由于碳硫復(fù)合電極的首次放電容量比純硫電極高。 The close contact between the conductive carbon black and the insulating sulfurlowers the resistance for electrons transferring across the interface between them. 導(dǎo)電炭黑與絕緣硫的緊密接觸減小了兩者界面間電子轉(zhuǎn)移電阻。 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.在隨后的循環(huán)中（第1圈，第25圈，第50 圈），純硫電極電荷轉(zhuǎn)移電阻的增加程度要遠(yuǎn)大于碳硫復(fù)合物電極。 The main reason for this is the porous structure of the cycled pure sulfur cathode. 循環(huán)純硫電極的多孔結(jié)構(gòu)導(dǎo)致了這一現(xiàn)象的出現(xiàn)。 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]. 在孔內(nèi)單向生產(chǎn)的硫化鋰層阻礙了電子在導(dǎo)電碳和活性材料之間的轉(zhuǎn)移。 The EIS measurements thus reveal that the sulfur–carbon composite cathode exhibits better electronic conductivity and lithium-ion transport than the puresulfur cathode due to the stable network structure of carbon black wrapping around the sulfur. 電化學(xué)阻抗譜的測(cè)試結(jié)果顯示，由于碳硫復(fù)合電極具有碳包裹硫的穩(wěn)定網(wǎng)狀結(jié)構(gòu)，它的電子導(dǎo)電性以及鋰離子的轉(zhuǎn)移要比純硫電極好。 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. 在50圈循環(huán)后，碳硫復(fù)合電極的阻抗并沒有明顯增加，說明在循環(huán)過程中網(wǎng)狀結(jié)構(gòu)保持完整。 參考…… |
9樓2013-04-26 23:18:57
ruiyuan121
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喲喲william2樓2013-04-26 22:04:33
喲喲william
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3樓2013-04-26 22:05:21
ruiyuan121
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4樓2013-04-26 22:11:12
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