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首页> 外文期刊>Advanced Functional Materials >Creating Effective Nanoreactors on Carbon Nanotubes with Mechanochemical Treatments for High-Areal-Capacity Sulfur Cathodes and Lithium Anodes
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Creating Effective Nanoreactors on Carbon Nanotubes with Mechanochemical Treatments for High-Areal-Capacity Sulfur Cathodes and Lithium Anodes

机译：通过机械化学处理在碳纳米管上创建有效的纳米反应器，以进行高容量处理的硫阴极和锂阳极

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1800595.1-1800595.9%Li-S batteries can potentially deliver high energy density and power, but polysulfide shuttle and lithium dendrite formations on Li metal anode have been the major hurdle. The polysulfide shuttle becomes severe particularly when the areal loading of the active material (sulfur) is increased to deliver the high energy density and the charge/discharge current density is raised to deliver high power. This study reports a novel mechanochemical method to create trenches on the surface of carbon nanotubes (CNTs) in free-standing 3D porous CNT sponges. Unique spiral trenches are created by pressures during the chemical treatment process, providing polysulfide-philic surfaces for cathode and lithiophilic surfaces for anode. The Li-S cells made from manufacturing-friendly sulfur-sandwiched cathodes and lithium-infused anodes using the mechanochemically treated electrodes exhibit a strikingly high areal capacity as high as 13.3 mAh cm(-2), which is only marginally reduced even with a tenfold increase in current density (16 mA cm(-2)), demonstrating both high cell-level energy density and power. The outstanding performance can be attributed to the significantly improved reaction kinetics and lowered overpotentials coming from the reduced interfacial resistance and charge transfer resistance at both cathodes and anodes. The trench-wall CNT sponge simultaneously tackles the most critical problems on both the cathodes and anodes of Li-S batteries, and this method can be utilized in designing new electrode materials for energy storage and beyond.
机译：1800595.1-1800595.9％Li-S电池可以潜在地提供高能量密度和功率，但是Li金属阳极上的多硫化物梭和锂枝晶形成一直是主要障碍。特别是当增加活性材料（硫）的面积负荷以传递高能量密度并且提高充电/放电电流密度以传递高功率时，多硫化物往复运动变得严重。这项研究报告了一种新颖的机械化学方法，可在独立式3D多孔CNT海绵中的碳纳米管（CNT）表面上形成沟槽。在化学处理过程中，压力产生独特的螺旋沟槽，从而为阴极提供了多硫化物表面，为阳极提供了亲硫表面。使用机械化学处理过的电极，由易于制造的硫夹心阴极和注入锂的阳极制成的Li-S电池具有惊人的高单位面积容量，高达13.3 mAh cm（-2），即使是原来的十倍也仅略有减少电流密度（16 mA cm（-2））的增加，证明了电池级的高能量密度和功率。出色的性能可归因于显着改善的反应动力学和降低的超电势，这归因于阴极和阳极的界面电阻和电荷转移电阻降低。沟槽壁CNT海绵同时解决了Li-S电池正极和负极上最关键的问题，该方法可用于设计用于储能及其他领域的新型电极材料。

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