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首页> 外文期刊>Advanced energy materials >Vertically Oriented MoS_2 with Spatially Controlled Geometry on Nitrogenous Graphene Sheets for High-Performance Sodium-Ion Batteries
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Vertically Oriented MoS_2 with Spatially Controlled Geometry on Nitrogenous Graphene Sheets for High-Performance Sodium-Ion Batteries

机译：用于高性能钠离子电池的氮石墨烯片上具有空间可控几何形状的垂直取向MoS_2

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摘要

Inspired by the great success of graphite in lithium-ion batteries, anode materials that undergo an intercalation mechanism are considered to provide stable and reversible electrochemical sodium-ion storage for sodium-ion battery (SIB) applications. Though MoS2 is a promising 2D material for SIBs, it suffers from deformation of its layered structure during repeated intercalation of Na+, resulting in undesirable electrochemical behaviors. In this study, vertically oriented MoS2 on nitrogenous reduced graphene oxide sheets (VO-MoS2/N-RGO) is presented with designed spatial geometries, including sheet density and height, which can deliver a remarkably high reversible capacity of 255 mA h g(-1) at a current density of 0.2 A g(-1) and 245 mA h g(-1) at a current density of 1 A g(-1), with a total fluctuation of 5.35% over 1300 cycles. These results are superior to those obtained with well-developed hard carbon structures. Furthermore, a SIB full cell composed of the optimized VO-MoS2/N-RGO anode and a Na2V3(PO4)(3) cathode reaches a specific capacity of 262 mA h g(-1) (based on the anode mass) during 50 cycles, with an operated voltage range of 2.4 V, demonstrating the potentially rewarding SIB performance, which is useful for further battery development.
机译：受石墨在锂离子电池中取得巨大成功的启发，经过插层机理的阳极材料被认为可为钠离子电池（SIB）应用提供稳定且可逆的电化学钠离子存储。尽管MoS2是用于SIB的有前途的2D材料，但它在重复插入Na +期间会遭受分层结构变形的影响，从而导致不良的电化学行为。在这项研究中，提出了在含氮的氧化石墨烯薄板（VO-MoS2 / N-RGO）上垂直取向的MoS2具有设计的空间几何形状，包括薄板密度和高度，可以提供非常高的255 mA hg（-1）可逆容量。 ）的电流密度为0.2 A g（-1）和245 mA hg（-1），电流密度为1 A g（-1），在1300个周期中总波动为5.35％。这些结果优于采用发达的硬碳结构获得的结果。此外，由优化的VO-MoS2 / N-RGO阳极和Na2V3（PO4）（3）阴极组成的SIB全电池在50个循环中达到了262 mA hg（-1）的比容量（基于阳极质量） ，其工作电压范围为2.4 V，证明了潜在有益的SIB性能，这对于进一步开发电池很有用。

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