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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。
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An in situ sulfur deposition route has been developed for synthesizing sulfur–carbon composites as cathode materials for lithium–sulfur batteries. This facile synthesis method involves the precipitation of elemental sulfur at the interspaces between carbon nanoparticles in aqueous solution at room temperature. The product has been characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, charge–discharge measurements, and electrochemical impedance spectroscopy. The sulfur–carbon composite cathode with 75 wt.% active material thus obtained exhibits a remarkably high first discharge capacity of 1116 mAh g−1 with good cycle performance, maintaining 777 mAh g−1 after 50 cycles. The significantly improved electrochemical performance of the sulfur–carbon composite cathode is attributed to the carbon-wrapped sulfur network structure, which suppresses the loss of active material during charging/discharging and the migration of the polysulfide ions to the anode (i.e., shuttling effect). The integrity of the cathode structure during cycling is reflected in low impedance values observed after cycling. This facile in situ sulfur deposition route represents a low-cost approach to obtain high-performance sulfur–carbon composite cathodes for rechargeable Li–S batteries. |

木蟲 (著名寫手)

木蟲 (小有名氣)

木蟲 (小有名氣)
| 提出了一種原位沉積硫的方法來制備硫碳復(fù)合物以作為鋰-硫電池的陽極材料。這種合成方法通過室溫下在分散在水溶液中的碳納米粒子之間的間隙中沉積元素硫而實(shí)現(xiàn)。通過X-射線衍射、掃描電鏡、透射電鏡、恒流充放電、電化學(xué)交流阻抗等對樣品進(jìn)行測試和表征。通過這種方法得到了含活性材料的質(zhì)量分?jǐn)?shù)為75%的硫碳復(fù)合物電極,這種電極顯示了非常好的首次充放電能力,高達(dá)1116 mAh g-1,并具有良好的充放電循環(huán)性能,在50次充放電循環(huán)后還保持777 mAh g-1。硫碳復(fù)合物電極的電化學(xué)性能相比傳統(tǒng)材料有了很大提高,主要是由于碳對于硫的網(wǎng)絡(luò)結(jié)構(gòu)形成了包裹。這種包裹抑制了充放電過程中活性材料的損耗和多硫根離子向陰極的遷移(即穿梭效應(yīng))。陽極結(jié)構(gòu)在充放電循環(huán)過程中的完整性可以通過循環(huán)后的低阻抗值來驗證。該種原位硫沉積法提出一種制備低成本高性能的鋰-硫充電電池的硫碳復(fù)合物陽極的方法。 |
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木蟲 (小有名氣)

木蟲 (小有名氣)

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