Co−Ni Binary‐Metal Oxide Coated with Porous Carbon Derived from Metal‐Organic Framework as Host of Nano‐Sulfur for Lithium‐Sulfur Batteries,Batteries & Supercaps

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Co−Ni Binary‐Metal Oxide Coated with Porous Carbon Derived from Metal‐Organic Framework as Host of Nano‐Sulfur for Lithium‐Sulfur Batteries
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2019-11-08 , DOI: 10.1002/batt.201900121
Xuan Zhang ₁ , Yu Fan ₁ , Muhammad Arif Khan ₁ , Hongbin Zhao ₁ , Daixin Ye ₁ , Jiulin Wang ₂ , Baohua Yue ₁ , Jianhui Fang ₁ , Jiaqiang Xu ₁ , Lei Zhang ₃ , Jiujun Zhang ₁

Affiliation

Lithium‐sulfur battery is considered as a promising energy storage system because of its high energy density. The specific capacity and cycling stability of sulfur cathode, however, are impeded by intrinsic poor electrical conductivity of sulfur and dissolution of polysulfides intermediates. Herein, we demonstrate a novel strategy to overcome the two obstacles by designing a bimetallic‐organic‐framework‐derived nano‐sulfur host consisted of porous graphitic carbon and bimetallic cobalt‐nickel oxides (C/NiCo₂O₄), in which porous carbon and NiCo₂O₄ not only entrapping the polysulfides effectively through physical and chemical entrapment capability, but also serving as a highly conductive matrix for sulfur. With a sulfur content of 68.9 % in the composite, the composite cathode delivered a specific capacity of 977 mAh g⁻¹ and maintained 673 mAh g⁻¹ at 0.5 C over 500 cycles. Besides, the binding mechanism between NiCo₂O₄ and polysulfides has been explored by ex situ XRD and density functional theory(DFT)simulation. This work may provide a feasible strategy to improve the performance of lithium‐sulfur battery.

中文翻译：

锂-硫电池用纳米硫主体金属-有机骨架多孔碳包覆的钴镍二元金属氧化物

锂硫电池由于其高能量密度而被认为是有前途的储能系统。然而，硫固有的较差的电导率和多硫化物中间体的溶解阻碍了硫阴极的比容量和循环稳定性。本文中，我们展示了一种通过设计由双金属有机框架衍生的纳米硫主体克服两个障碍的新颖策略，该主体由多孔石墨碳和双金属钴-镍氧化物（C / NiCo ₂ O ₄）组成，其中多孔碳和NiCo ₂ O ₄不仅通过物理和化学截留能力有效地捕获了多硫化物，而且还可以作为硫的高导电性基质。复合材料中的硫含量为68.9％，该复合材料阴极的比容量为977 mAh g ^-1，在500个循环中于0.5 C保持673 mAh g ^-1。此外，通过异位XRD和密度泛函理论（DFT）模拟，探讨了NiCo ₂ O ₄与多硫化物之间的结合机理。这项工作可能为提高锂硫电池的性能提供可行的策略。

更新日期：2019-11-08

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