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首页> 外文期刊>Advanced energy materials >Elastic Sandwich-Type rGO-VS2/S Composites with High Tap Density: Structural and Chemical Cooperativity Enabling Lithium-Sulfur Batteries with High Energy Density
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Elastic Sandwich-Type rGO-VS2/S Composites with High Tap Density: Structural and Chemical Cooperativity Enabling Lithium-Sulfur Batteries with High Energy Density

机译：具有高振实密度的弹性三明治型rGO-VS2 / S复合材料：结构和化学合作性使锂硫电池具有高能量密度

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摘要

Driven by increasing demand for high-energy-density batteries for consumer electronics and electric vehicles, substantial progress is achieved in the development of long-life lithium-sulfur (Li-S) batteries. Less attention is given to Li-S batteries with high volume energy density, which is crucial for applications in compact space. Here, a series of elastic sandwich-structured cathode materials consisting of alternating VS2-attached reduced graphene oxide (rGO) sheets and active sulfur layers are reported. Due to the high polarity and conductivity of VS2, a small amount of VS2 can suppress the shuttle effect of polysulfides and improve the redox kinetics of sulfur species in the whole sulfur layer. Sandwich-structured rGO-VS2/S composites exhibit significantly improved electrochemical performance, with high discharge capacities, low polarization, and excellent cycling stability compared with their bare rGO/S counterparts. Impressively, the tap density of rGO-VS2/S with 89 wt% sulfur loading is 1.84 g cm(-3), which is almost three times higher than that of rGO/S with the same sulfur content (0.63 g cm(-3)), and the volumetric specific capacity of the whole cell is as high as 1182.1 mA h cm(-3), comparable with the state-of-the-art reported for energy storage devices, demonstrating the potential for application of these composites in long-life and high-energy-density Li-S batteries.
机译：在消费电子产品和电动汽车对高能量密度电池的需求不断增长的推动下，长寿命锂硫（Li-S）电池的开发取得了实质性进展。体积能量密度高的Li-S电池受到的关注较少，这对于紧凑空间中的应用至关重要。在此，报道了一系列由弹性体夹心结构的阴极材料，该材料由交替的VS2连接的还原氧化石墨烯（rGO）片和活性硫层组成。由于VS2具有高极性和高导电性，因此少量VS2可以抑制多硫化物的穿梭效应，并改善整个硫层中硫物种的氧化还原动力学。三明治结构的rGO-VS2 / S复合材料与裸露的rGO / S相比，具有显着改善的电化学性能，具有高放电容量，低极化和出色的循环稳定性。令人印象深刻的是，硫含量为89 wt％的rGO-VS2 / S的振实密度为1.84 g cm（-3），几乎是相同硫含量（0.63 g cm（-3）的rGO / S的振实密度的三倍。 ）），并且整个电池的体积比容量高达1182.1 mA h cm（-3），与报道的储能设备的最新技术水平相当，证明了这些复合材料在电动汽车中的应用潜力长寿命高能量密度锂电池。

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  • 来源
    《Advanced energy materials》 |2018年第10期|1702337.1-1702337.12|共12页
  • 作者

    Cheng Zhibin; Xiao Zhubing; Pan Hui; Wang Shiqing; Wang Ruihu;

  • 作者单位

    Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China;

    Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China;

    Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China;

    Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China;

    Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    lithium-sulfur batteries; sandwich-type structures; shuttle effects; tap densities; volumetric capacities;

    机译：锂硫电池;三明治型结构;穿梭效应;振实密度;体积容量;

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