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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Graphene-encapsulated sulfur (GES) composites with a core-shell structure as superior cathode materials for lithium-sulfur batteries
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Graphene-encapsulated sulfur (GES) composites with a core-shell structure as superior cathode materials for lithium-sulfur batteries

机译：具有核-壳结构的石墨烯包封的硫（GES）复合材料是锂硫电池的优质正极材料

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摘要

Relatively uniform sized graphene-encapsulated sulphur (GES) composites with a core (S)-shell (graphene) structure were synthesized in one pot based on a solution-chemical reaction-deposition method. These novel GES particles were characterized by XRD, Raman spectrometry, SEM, TGA, EDS and TEM. The electrochemical tests showed that the present GES composites exhibit high specific capacity, good discharge capacity retention and superior rate capability when they were employed as cathodes in rechargeable Li-S cells. A high sulphur content (83.3 wt%) was obtained in the GES composites. Stable discharge capacities of about 900, 650, 540 and 480 mA h g~(-1) were achieved at 0.75, 2.0, 3.0 and 6.0 C, respectively. The good electrochemical performance is attributed to the high electrical conductivity of the graphene, the reasonable particle size of sulphur particles, and the core-shell structures that have synergistic effects on facilitating good transport of electrons from the poorly conducting sulphur, preserving fast transport of lithium ions to the encapsulated sulphur particles, and alleviating the polysulfide shuttle phenomenon. The present finding may provide a significant contribution to the enhancement of cathodes for the lithium-sulphur battery technology.
机译：基于溶液化学反应沉积法，在一个罐中合成了尺寸相对均匀的具有核（S）-壳（石墨烯）结构的石墨烯包封的硫（GES）复合材料。通过XRD，拉曼光谱，SEM，TGA，EDS和TEM对这些新型GES颗粒进行了表征。电化学测试表明，当本发明的GES复合材料用作可再充电Li-S电池中的阴极时，其显示出高的比容量，良好的放电容量保持率和优异的倍率性能。在GES复合材料中获得了高硫含量（83.3 wt％）。在0.75、2.0、3.0和6.0 C时分别获得约900、650、540和480 mA h g〜（-1）的稳定放电容量。良好的电化学性能归因于石墨烯的高电导率，合​​理的硫颗粒尺寸以及核壳结构，它们具有协同作用，有利于从不良导电的硫中良好地传输电子，从而保持锂的快速传输离子进入包封的硫颗粒，并减轻了多硫化物的穿梭现象。本发现可以为锂-硫电池技术的阴极的增强做出重大贡献。

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