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An in situ sulfur deposition route has been developed by the heterogeneous nucleation of sulfur onto conductive carbon black (Super P) from a solution-based reaction of sodium thiosulfate with hydrochloric acid. This facile synthesis method can produce high-purity sulfur¨Ccarbon composites for large-scale manufacturing. The sulfur¨Ccarbon composite thus produced exhibits discharge capacities of, respectively, 1116 mAh g−1 in the first cycle and 777 mAh g−1 after 50 cycles. Even after 50 cycles at a higher rate of C/4 (419 mA g−1), the reversible capacity is still 697 mAh g−1, which translates to a capacity retention of 82%. The excellent cycle performance of this sulfur¨Ccarbon composite can be attributed to the conductive carbon-wrapped sulfur network structure, which not only decreases the charge transfer resistance but also helps maintaining the integrity of the electrode structure during cycling. The carbon black matrix also plays a protective role as an adsorbent agent to keep the soluble polysulfides within the electrode structure, avoiding the unwanted shuttle effect during charging. We believe this facile in situ sulfur deposition route to obtain sulfur¨Ccarbon composites possessing good electrochemical performance could enhance the feasibility of practical Li¨CS batteries. ¹òÇó´óÉñ׼ȷ·Ò룬ÓÃÈí¼þ·ÒëµÄÇëÈÆÐУ¬Ð»Ð»¡£ ![]() ![]() |
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