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首页> 外文期刊>Advanced energy materials >Sulfiphilic Few-Layered MoSe_2 Nanoflakes Decorated rGO as a Highly Efficient Sulfur Host for Lithium-Sulfur Batteries
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Sulfiphilic Few-Layered MoSe_2 Nanoflakes Decorated rGO as a Highly Efficient Sulfur Host for Lithium-Sulfur Batteries

机译：嗜硫的几层MoSe_2纳米薄片将rGO装饰为锂硫电池的高效硫主体

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摘要

Lithium-sulfur batteries (LSBs) have been regarded as a competitive candidate for next-generation electrochemical energy-storage technologies due to their merits in energy density. The sluggish redox kinetics of the electrochemistry and the high solubility of polysulfides during cycling result in insufficient sulfur utilization, severe polarization, and poor cyclic stability. Herein, sulfiphilic few-layered MoSe2 nanoflakes decorated rGO (MoSe2@rGO) hybrid has been synthesized through a facile hydrothermal method and for the first time, is used as a conceptually new-style sulfur host for LSBs. Specifically, MoSe2@rGO not only strongly interacts with polysulfides but also dynamically strengthens polysulfide redox reactions. The polarization problem is effectively alleviated by relying on the sulfiphilic MoSe2. Moreover, MoSe2@rGO is demonstrated to be beneficial for the fast nucleation and uniform deposition of Li2S, contributing to the high discharge capacity and good cyclic stability. A high initial capacity of 1608 mAh g(-1) at 0.1 C, a slow decay rate of 0.042% per loop at 0.25 C, and a high reversible capacity of 870 mAh g(-1) with areal sulfur loading of 4.2 mg cm(-2) at 0.3 C are obtained. The concept of introducing sulfiphilic transition-metal selenides into the LSBs system can stimulate engineering of novel architectures with enhanced properties for various energy-storage devices.
机译：锂硫电池（LSB）由于其能量密度方面的优势，已被视为下一代电化学储能技术的竞争者。电化学反应迟钝的氧化还原动力学和循环过程中多硫化物的高溶解度会导致硫利用率不足，极化严重以及循环稳定性差。本文中，通过简便的水热法合成了具有亚磺酸盐的几层MoSe2纳米薄片装饰的rGO（MoSe2 @ rGO）杂化物，并且首次将其用作LSB的概念上新型的硫基质。具体地说，MoSe2 @ rGO不仅与多硫化物强烈相互作用，而且还动态地增强了多硫化物的氧化还原反应。依靠亚磺基MoSe2可以有效缓解极化问题。此外，MoSe2 @ rGO被证明有利于Li2S的快速成核和均匀沉积，有助于高放电容量和良好的循环稳定性。在0.1 C时具有1608 mAh g（-1）的高初始容量，在0.25 C时每个回路的缓慢衰减率为0.042％，在面积硫负荷为4.2 mg cm时具有870 mAh g（-1）的高可逆容量。得到0.3℃的（-2）。将硫辛基过渡金属硒化物引入LSBs系统的想法可以刺激对各种储能装置性能增强的新型架构的工程设计。

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