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Facile synthesis of Li_2S-polypyrrole composite structures for high-performance Li_2S cathodes

机译:用于高性能Li_2S阴极的Li_2S-聚吡咯复合结构的简便合成

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摘要

Li_2S is an attractive prelithiated cathode material with a high theoretical capacity of 1166 mA h g~(-1), which is far above that of its transition metal oxide/phosphate counterparts. Here, we demonstrate facile, in situ synthesis of Li_2S-polypyrrole composites for use as high-performance Li_2S cathodes. The N atoms in polypyrrole were found to possess favorable Li-N interaction with Li_2S, which enables polypyrrole to bind strongly onto and cover the surface of Li_2S to constrain intermediate polysutfides during cycling. Polypyrrole, being a conducting polymer, also helps to facilitate electronic conduction. Using the Li_2S-polypyrrole composites as a cathode material, we demonstrate a high discharge capacity of 785 mA h g~(-1) of Li_2S (~1126 mA h g~(-1) of S) with stable cycling over prolonged 400 charge/discharge cycles.
机译:Li_2S是一种有吸引力的预电镀阴极材料,具有1166 mA h g〜(-1)的高理论容量,远高于其过渡金属氧化物/磷酸盐对应物的理论容量。在这里,我们演示了用作高性能Li_2S阴极的Li_2S-聚吡咯复合材料的便捷,原位合成。发现聚吡咯中的N原子与Li_2S具有良好的Li-N相互作用,这使聚吡咯牢固地结合到Li_2S的表面并覆盖Li_2S的表面,从而在循环过程中限制了中间的多硫化物。聚吡咯是一种导电聚合物,也有助于促进电子导电。使用Li_2S-聚吡咯复合材料作为正极材料,我们证明了Li_2S的高放电容量为785 mA hg〜(-1)(S的〜1126 mA hg〜(-1)),并且在400次充/放电期间具有稳定的循环周期。

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  • 来源
    《Energy & environmental science》 |2014年第2期|672-676|共5页
  • 作者单位

    Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA;

    Department of Applied Physics, Stanford University, Stanford, California 94305, USA;

    Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA;

    School of Materials Science and Engineering, Beihang University, Beijing 100191, P.R. China;

    Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA;

    Department of Chemical Engineering, Stanford University, Stanford, California 94305, USA;

    Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA;

    Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA ,Stanford Institute for Materials and Energy Science, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA;

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