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Creating Edge Sites within the 2D Metal-Organic Framework Boosts Redox Kinetics in Lithium–Sulfur Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2022-09-18 , DOI: 10.1002/aenm.202201960 Xingbo Wang 1, 2 , Chunrong Zhao 1 , Bingxue Liu 1 , Shangqian Zhao 1, 3 , Yongguang Zhang 4 , Lanting Qian 5 , Zhongjun Chen 6 , Jiantao Wang 1 , Xin Wang 2 , Zhongwei Chen 5
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2022-09-18 , DOI: 10.1002/aenm.202201960 Xingbo Wang 1, 2 , Chunrong Zhao 1 , Bingxue Liu 1 , Shangqian Zhao 1, 3 , Yongguang Zhang 4 , Lanting Qian 5 , Zhongjun Chen 6 , Jiantao Wang 1 , Xin Wang 2 , Zhongwei Chen 5
Affiliation
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Lithium–sulfur batteries have received extensive interest owing to their exceptionally high energy density. Nonetheless, their practical implementation is still impeded by the shuttle effect of polysulfides and sluggish conversion kinetics. Considering that, a porous 2D defective zeolitic imidazolate framework-7 (ZIF-7) with abundant active edges is rationally designed as multifunctional sulfur carriers for Li–S batteries. The 2D ZIF-7 enables uniform distribution of sulfur and rapid Li-ion diffusion, while rich edges facilitate sufficient exposure to active sites capturing and catalyzing polysulfides. In addition, the nitrogen defects on edge sites can further accelerate the transformation of polysulfides and decrease the energy barrier of Li2S decomposition. Consequently, the Li–S batteries demonstrate surprisingly practical prospects with a stable capacity of 676.9 mAh g−1 over 500 cycles at 1 C (capacity retention rate = 72.3%). When assembled into a pouch cell at 2.3 mg cm−2, it still exhibits a high capacity of 901.1 mAh g−1 after 100 cycles at 0.1 C. This work offers a rational structural design strategy to tackle the challenges of the sulfur cathode.
中文翻译：
在二维金属有机框架内创建边缘站点可促进锂硫电池中的氧化还原动力学
锂硫电池因其极高的能量密度而受到广泛关注。尽管如此，它们的实际实施仍然受到多硫化物的穿梭效应和缓慢的转化动力学的阻碍。考虑到这一点，合理设计了具有丰富活性边缘的多孔二维缺陷沸石咪唑酯骨架-7（ZIF-7）作为锂硫电池的多功能硫载体。2D ZIF-7 可实现硫的均匀分布和快速的锂离子扩散，而丰富的边缘有助于充分暴露于捕获和催化多硫化物的活性位点。此外，边缘位点的氮缺陷可以进一步加速多硫化物的转变，降低Li 2的能垒。S分解。因此，Li-S 电池显示出令人惊讶的实用前景，在 1 C 下 500 次循环后的稳定容量为 676.9 mAh g -1 （容量保持率 = 72.3%）。当组装成 2.3 mg cm -2的软包电池时，在 0.1 C 下循环 100 次后仍表现出 901.1 mAh g -1的高容量。这项工作为应对硫正极的挑战提供了合理的结构设计策略。
更新日期：2022-09-18
中文翻译：
在二维金属有机框架内创建边缘站点可促进锂硫电池中的氧化还原动力学
锂硫电池因其极高的能量密度而受到广泛关注。尽管如此，它们的实际实施仍然受到多硫化物的穿梭效应和缓慢的转化动力学的阻碍。考虑到这一点，合理设计了具有丰富活性边缘的多孔二维缺陷沸石咪唑酯骨架-7（ZIF-7）作为锂硫电池的多功能硫载体。2D ZIF-7 可实现硫的均匀分布和快速的锂离子扩散，而丰富的边缘有助于充分暴露于捕获和催化多硫化物的活性位点。此外，边缘位点的氮缺陷可以进一步加速多硫化物的转变，降低Li 2的能垒。S分解。因此，Li-S 电池显示出令人惊讶的实用前景，在 1 C 下 500 次循环后的稳定容量为 676.9 mAh g -1 （容量保持率 = 72.3%）。当组装成 2.3 mg cm -2的软包电池时，在 0.1 C 下循环 100 次后仍表现出 901.1 mAh g -1的高容量。这项工作为应对硫正极的挑战提供了合理的结构设计策略。
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