Conductive porous vanadium nitride/graphene composite as chemical anchor of polysulfides for lithium-sulfur batteries.
Conductive porous vanadium nitride/graphene composite as chemical anchor of polysulfides for lithium-sulfur batteries.
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导电多孔氮化钒/石墨烯复合材料作为锂硫电池多硫化物化学锚
DOI：
10.1038/ncomms14627
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发表时间：
2017-03-03
影响因子：
16.6
通讯作者：
Li F
中科院分区：
文献类型：
--
作者：
Sun Z;Zhang J;Yin L;Hu G;Fang R;Cheng HM;Li F
虽然可充电锂硫电池是一种先进的储能系统，但其实际应用受到许多问题的阻碍，特别是穿梭效应导致容量衰减快，库仑效率低。在此，我们报告了一种导电多孔氮化钒纳米带/石墨烯复合材料，可容纳阴极作为锂硫电池的阴极。氮化钒/石墨烯复合材料为多硫化物提供了强锚定和快速多硫化物转化。实验和理论结果证实了氮化钒的锚定作用。由于氮化钒的高导电性，复合阴极比还原氧化石墨烯阴极具有更低的极化和更快的氧化还原反应动力学，具有良好的速率和循环性能。初始容量达到1,471 mAh g - 1，在0.2℃下循环100次后的容量为1,252 mAh g - 1，损耗仅为15%，具有用于高能锂硫电池的潜力。锂硫电池是一种很有前途的下一代储能技术。然而，它们的性能受到寄生梭子效应的影响。在这里，作者报告了一种由多孔氮化钒纳米带和石墨烯组成的阴极材料，为多硫化物提供锚定。
Although the rechargeable lithium–sulfur battery is an advanced energy storage system, its practical implementation has been impeded by many issues, in particular the shuttle effect causing rapid capacity fade and low Coulombic efficiency. Herein, we report a conductive porous vanadium nitride nanoribbon/graphene composite accommodating the catholyte as the cathode of a lithium–sulfur battery. The vanadium nitride/graphene composite provides strong anchoring for polysulfides and fast polysulfide conversion. The anchoring effect of vanadium nitride is confirmed by experimental and theoretical results. Owing to the high conductivity of vanadium nitride, the composite cathode exhibits lower polarization and faster redox reaction kinetics than a reduced graphene oxide cathode, showing good rate and cycling performances. The initial capacity reaches 1,471 mAh g−1 and the capacity after 100 cycles is 1,252 mAh g−1 at 0.2 C, a loss of only 15%, offering a potential for use in high energy lithium–sulfur batteries. Lithium sulfur batteries are a promising next generation storage technology. Their performance, however, is subject to the parasitic shuttle effect. Here the authors report a cathode material comprising porous vanadium nitride nanoribbon and graphene to provide anchoring for polysulfides.