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An in situ sulfur deposition route has been developed for synthesizing sulfur¨Ccarbon composites as cathode materials for lithium¨Csulfur 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¨Cdischarge measurements, and electrochemical impedance spectroscopy. The sulfur¨Ccarbon 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¨Ccarbon 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¨Ccarbon composite cathodes for rechargeable Li¨CS batteries. |
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