Vertically Aligned Sulfiphilic Cobalt Disulfide Nanosheets Supported on a Free-Standing Carbon Nanofiber Interlayer for High-Performance Lithium–Sulfur Batteries,ACS Sustainable Chemistry & Engineering

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Vertically Aligned Sulfiphilic Cobalt Disulfide Nanosheets Supported on a Free-Standing Carbon Nanofiber Interlayer for High-Performance Lithium–Sulfur Batteries
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-06-16 , DOI: 10.1021/acssuschemeng.1c01494
Hyunseok Yoon ₁ , Dongjoo Park ₁ , Hee Jo Song ₁ , Sangbaek Park ₂ , Dong-Wan Kim ₁

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Lithium–sulfur batteries (LSBs) are considered as a potential candidate for replacing lithium-ion batteries (LIBs), owing to their high theoretical energy density and low cost. However, the practical development of LSBs is considerably impeded, owing to the shuttling effect caused by soluble lithium polysulfide. Herein, we report porous cobalt disulfide (CoS₂) nanosheets vertically grown on activated cellulose-derived carbon nanofibers (CoS₂/ACCF) as an excellent interlayer for LSBs. The vertically arranged two-dimensional (2D) CoS₂ nanosheets maximized the reactive surface area exposed to the electrolyte. In addition, each CoS₂ nanosheet has a unique porous and crystalline structure comprising numerous nanograins encapsulated by carbon, which induces excellent electrical conductivity and stability. Benefiting from its novel architecture, CoS₂/ACCF provides superior high-rate performance (815 mA h g^–1 at 2C) in LSBs. Furthermore, electrochemical impedance spectroscopy studies proved that CoS₂/ACCF accelerated the interfacial reaction kinetics through highly exposed active sites on vertical 2D nanosheets, resulting in reversible and stable long-term cycling performance (982 mA h g^–1 after 100 cycles at 0.1C and 580 mA h g^–1 after 500 cycles at 1C). Therefore, this work suggests a new strategy to design an effective interlayer through a facile and cost-effective method for the commercialization of LSBs.

中文翻译：

用于高性能锂硫电池的独立碳纳米纤维中间层支撑的垂直排列的亲硫二硫化钴纳米片

锂硫电池（LSBs）由于其理论能量密度高和成本低而被认为是替代锂离子电池（LIBs）的潜在候选者。然而，由于可溶性多硫化锂引起的穿梭效应，LSBs的实际发展受到很大阻碍。在此，我们报告了在活性纤维素衍生的碳纳米纤维 (CoS ₂ /ACCF)上垂直生长的多孔二硫化钴 (CoS ₂ ) 纳米片作为 LSB 的极好夹层。垂直排列的二维 (2D) CoS ₂纳米片使暴露于电解质的反应表面积最大化。此外，每个 CoS ₂纳米片具有独特的多孔和晶体结构，包含许多被碳包裹的纳米颗粒，具有优异的导电性和稳定性。得益于其新颖的架构，CoS ₂ /ACCF在 LSB 中提供了卓越的高速性能（815 mA hg ^–1 at 2C）。此外，电化学阻抗谱研究证明 CoS ₂ /ACCF 通过垂直二维纳米片上高度暴露的活性位点加速了界面反应动力学，导致可逆和稳定的长期循环性能（0.1C 和 100 次循环后982 mA hg ^–1 580 毫安汞^–1在 1C 下 500 次循环后）。因此，这项工作提出了一种新策略，通过一种简便且具有成本效益的方法来设计有效的中间层，以实现 LSB 的商业化。

更新日期：2021-06-28

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