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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Metal multiple-sulfides with nitrogen doped carbon layer for high performance lithium-sulfur batteries
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Metal multiple-sulfides with nitrogen doped carbon layer for high performance lithium-sulfur batteries

机译：金属多硫化物，具有氮掺杂碳层，用于高性能锂 - 硫磺电池

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摘要

Lithium-sulfur battery has emerged as one of the greatest battery technologies because of its high energy density, however, the cycling performance is not satisfied mainly due to the dissolution of lithium polysulfides. To solve this problem, herein CoSx in a composite with nitrogen doped carbon and sulfur (CoSx-NC-S) synthesized from zeolitic imidazolate framework-67 (ZIF-67), was used to restrain shuttle-effect of polysulfides during cycling. The porous N-doped carbon polyhedra can not only improve the electronic conductivity, but also restrict the polysulfides and relieve the volume expansion of sulfur during cycling. Meanwhile, the CoSx nanoparticles embedded in the carbon polyhedra have powerful attraction with polysulfides, which is advantageous to the stable cycling behavior of electrodes. Applied in the lithium-sulfur battery as cathode, CoSx-NC-S electrode delivered a capacity of 952 mAh . g(-1) at 0.2 C after 150 cycles, and 570 mAh . g(-1) after 600 cycles even at the high rate of 2 C, which is significantly superior to the performance of NC-S electrodes and S-C electrodes. (C) 2019 Elsevier B.V. All rights reserved.
机译：由于其高能量密度，锂 - 硫电池作为最大的电池技术之一，然而，循环性能不满足，主要是由于锂多硫化物的溶解。为了解决该问题，本文中的COSX在具有从沸石咪唑酯框架-67（ZIF-67）中合成的氮掺杂碳和硫（COSX-NC-S）的复合物中，用于在循环期间抑制多硫化物的梭效应。多孔N掺杂的碳多孔不仅可以提高电子电导率，而且还限制多硫化物，并在循环期间减轻硫的体积膨胀。同时，嵌入在碳多孔中的COSX纳米颗粒具有具有多硫化物的强大吸引力，这对于电极的稳定循环行为有利。在锂 - 硫电池中施加为阴极，COSX-NC-S电极的容量为952mAh。 G（-1）在150次循环后0.2℃，570mAh。 G（-1）在600次循环之后，即使在2℃的高速率下也显着优于NC-S电极和S-C电极的性能。 （c）2019 Elsevier B.v.保留所有权利。

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