【摘 要】
：
A novel Li2S-C composite for Li-S battery cathode material was prepared by using PVP as carbon source to coat Li2S.The effects of mass ratios (mpvp∶mLi2S=0.5, 1, 1.5, 2), evaporation temperature(90, 1
【机 构】
：
College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen,P.R.China 518060
【出 处】
：
2016’中国溶胶-凝胶学术研讨会暨国际论坛
论文部分内容阅读
A novel Li2S-C composite for Li-S battery cathode material was prepared by using PVP as carbon source to coat Li2S.The effects of mass ratios (mpvp∶mLi2S=0.5, 1, 1.5, 2), evaporation temperature(90, 110, 130, 150 ℃), carbonization temperatures (500, 700, 900 ℃) on the electrochemical performance of Li2S-C composite were also studied.The structure and morphology of the composite cathode materials were characterized by transmission electron microscope and X-Ray Diffraction.The electrochemical performances of the Li2S-C composite were determined by charge-discharge test, cyclic voltammetry and electrochemical impedance spectroscopy.The results indicate thatthe cathode material with excellent electrochemical performance was obtained with mpvp∶mLi2S=1∶1, evaporation temperature at 150 ℃ and carbonization temperatures at 900 ℃.Andthe sampledelivers an initial discharge capacity of 1024.8mAhg-1 at the current density of 0.05C.
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