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A multifunctional SnO2-nanowires/carbon composite interlayer for high-performance lithium-sulfur batteries
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2020-06-27 , DOI: 10.1016/j.cej.2020.126042
Hyunwoo Ahn , Yoongon Kim , Jaejin Bae , Ye Kyu Kim , Won Bae Kim

Recently, lithium–sulfur (Li–S) batteries have been demonstrated as promising next-generation energy-storage devices. However, their practical application is hindered by poor cycling performance and rate capability. In this study, we prepared a multifunctional interlayer composed of SnO2 nanowires (NWs) and conductive carbon paper (CP) to enhance the electrochemical performance of Li–S batteries. This SnO2 NWs@CP interlayer could efficiently adsorb lithium polysulfides and provide electron-conductive pathways to the sulfur electrode, leading to suppression of the polysulfide shuttle effect and enhancement of the electrochemical reaction kinetics for cycling performance and rate capability. A lithium-sulfur cell fabricated with SnO2 NWs@CP interlayer at a high sulfur loading amount (ca. 4.0 mg cm−2) could deliver a high specific capacity of 815 mAh g−1 (based on sulfur) even after 100 cycles at 0.2 C with a high coulombic efficiency of 98.2%. These results demonstrate that the introduction of multifunctional SnO2 NWs@CP interlayers should be a promising new strategy for the development of high-energy-density Li–S batteries.



中文翻译:

用于高性能锂硫电池的多功能SnO 2-纳米线/碳复合中间层

最近,锂硫(Li–S)电池已被证明是有前途的下一代储能设备。然而,它们的实际应用受到不良的循环性能和速率能力的阻碍。在这项研究中,我们准备了由SnO 2纳米线(NWs)和导电碳纸(CP)组成的多功能中间层,以增强Li-S电池的电化学性能。该SnO 2 NWs @ CP中间层可以有效地吸附多硫化锂,并为硫电极提供电子传导路径,从而抑制了多硫化物的穿梭效应,并增强了电化学反应动力学,从而提高了循环性能和速率能力。用SnO 2制成的锂硫电池即使在0.2 C下循环100次,库仑效率为98.2,NWs @ CP夹层在高硫负载量(约4.0 mg cm -2)下仍可提供815 mAh g -1(基于硫)的高比容量。%。这些结果表明,引入多功能SnO 2 NWs @ CP中间层应该是开发高能量密度Li-S电池的有希望的新策略。

更新日期:2020-06-27
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