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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 >Stable performance of Li-S battery: Engineering of Li2S smart cathode by reduction of multilayer graphene-embedded 2D-MoS2
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Stable performance of Li-S battery: Engineering of Li2S smart cathode by reduction of multilayer graphene-embedded 2D-MoS2

机译：LI-S电池的稳定性能：通过减少多层石墨烯嵌入式2D-MOS2，LI2S智能阴极的工程

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Lithium-sulfur (Li-S) batteries are considered promising candidates for next-generation energy storage devices due to their ultrahigh theoretical gravimetric energy density, cost-effectiveness, and environmental friendliness. However, the application of Li-S batteries remains challenging; mainly due to a lack of understanding of the complex chemical reactions and associated equilibria that occur in a working Li-S system. A new approach preparing graphene-based active cathode materials of Li-S battery with spatially confined lithium sulfides is reported. The starting graphene-embedded 2D-MoS2 was synthesized by a solvothermal method in organic solvents followed by the calcination of trapped organic solvent molecules at 800 degrees C to give graphene single sheets inside the 2D-MoS2 layers with 7 A distance (MoS2-Gr-32.51). Then, it was electrochemically reduced/lithiated at potential 0.01 V vs Li+/Li generating metallic molybdenum and lithium sulfides. As a result, the structure of MoS2 multi-layers collapsed. The graphene multi-layer (MLGraphene) was left behind and shut the lithium sulfides between the layers. The sizes of Li2Sn (n = 4-6) are bigger than the inter-layer distance of ML-Graphene, and the escape of sulfur/sulfides from the cathode into the electrolyte is physically blocked alleviating shuttle effects. The specific capacity of ML-Graphene/lithium sulfides cathode was high of 1209 mAh/g(Mos2-Gr) at 0.1 C (1 C = 670 mA/g). The ML-Graphene exhibited the remarkable lithium intercalation capability, and the theoretical calculation has been carried out to give 2231.4 mAh/g. Such high capacity was hybridized with the theoretical capacity of sulfur (1675 mAh/g), and the ML-Graphene composite with dichalcogenides (2D-MoS2) became a promising platform for the cathode of Li-S batteries. (C) 2020 Elsevier B.V. All rights reserved.
机译：锂硫（Li-S）电池由于其超高的理论重量能量密度、成本效益和环境友好性，被认为是下一代储能装置的有希望的候选电池。然而，锂硫电池的应用仍然具有挑战性；这主要是由于缺乏对复杂化学反应和相关平衡的了解，这些平衡发生在工作的Li-S系统中。报道了一种利用空间受限的硫化锂制备石墨烯基锂硫电池活性正极材料的新方法。通过溶剂热法在有机溶剂中合成嵌入2D-MoS2的起始石墨烯，然后在800℃下煅烧捕获的有机溶剂分子，在2D-MoS2层内形成7 a距离的石墨烯单层（MoS2-Gr-32.51）。然后，在电位为0.01V vs Li+/Li的条件下对其进行电化学还原/锂化，生成金属钼和硫化锂。结果，MoS2多层膜的结构坍塌。石墨烯多层（MLGraphene）被留下，并封闭层间的锂硫化物。Li2Sn（n=4-6）的尺寸大于ML石墨烯的层间距离，硫/硫化物从阴极逃逸到电解液中被物理阻止，从而缓解穿梭效应。ML石墨烯/硫化锂阴极在0.1c（1c=670ma/g）下的比容量高达1209mah/g（mos2gr）。ML石墨烯表现出显著的嵌锂能力，理论计算得到了2231.4 mAh/g。这种高容量与硫的理论容量（1675 mAh/g）混合，ML石墨烯与二铝酸盐（2D-MoS2）的复合材料成为了锂硫电池阴极的一个有希望的平台。（C） 2020爱思唯尔B.V.版权所有。

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