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Amorphous Fe-Phytate Enables Fast Polysulfide Redox for High-Loading Lithium Sulfur Batteries
Small ( IF 13.0 ) Pub Date : 2023-06-27 , DOI: 10.1002/smll.202302548 Guangfeng Zeng 1 , Dongjiang Chen 2 , Cheng Zhen 3 , Chao Feng 4 , Yashuai Pang 4 , Weidong He 5
Small ( IF 13.0 ) Pub Date : 2023-06-27 , DOI: 10.1002/smll.202302548 Guangfeng Zeng 1 , Dongjiang Chen 2 , Cheng Zhen 3 , Chao Feng 4 , Yashuai Pang 4 , Weidong He 5
Affiliation
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Utilizing catalysts to accelerate polysulfides conversion are of paramount importance to eliminate the shuttling effect and improve the practical performance of lithium-sulfur (Li-S) batteries. The amorphism, attributes to the abundant unsaturated surface active sites, has recently been recognized as a contribution to increase the activity of catalysts. However, the investigation on amorphous catalysts has received limited interest in lithium-sulfur batteries due to lack of understanding of their composition structure activity. Herein, a amorphous Fe-Phytate structure is proposed to enhance polysulfide conversion and suppress polysulfide shuttling by modifying polypropylene separator (C-Fe-Phytate@PP). The polar Fe-Phytate with distorted VI coordination Fe active centers strongly intake polysulfide electron by forming FeS bond to accelerate the polysulfide conversion. The surface mediated polysulfides redox gives rise to a higher exchange current in comparison with carbon. Furthermore, Fe-Phytate owns robust adsorption to polysulfide and effectively reduce the shuttling effect. With the C-Fe-Phytate@PP separator, the Li-S batteries exhibit an outstanding rate capability of 690 mAh g−1 at 5 C and an ultrahigh areal capacity of 7.8 mAh cm−2 even at a high sulfur loading of 7.3 mg cm−2. The work provides a novel separator for facilitating the actual applications of Li-S batteries.
中文翻译：
无定形植酸铁可实现高负载锂硫电池的快速多硫化物氧化还原
利用催化剂加速多硫化物转化对于消除穿梭效应并提高锂硫（Li-S）电池的实际性能至关重要。无定形归因于丰富的不饱和表面活性位点，最近被认为有助于提高催化剂的活性。然而，由于缺乏对锂硫电池组成结构活性的了解，对非晶态催化剂的研究在锂硫电池中的兴趣有限。在此，提出了一种无定形 Fe-Phytate 结构，通过改性聚丙烯隔膜（C-Fe-Phytate@PP）来增强多硫化物转化并抑制多硫化物穿梭。具有扭曲的VI配位Fe活性中心的极性Fe-Phytate通过形成Fe - S键强烈吸收多硫化物电子，加速多硫化物的转化。与碳相比，表面介导的多硫化物氧化还原产生更高的交换电流。此外，Fe-Phytate对多硫化物具有强大的吸附能力，有效降低穿梭效应。使用C-Fe-Phytate@PP隔膜，Li-S电池在5 C下表现出690 mAh g -1的出色倍率能力，即使在7.3 mg的高硫负载量下也表现出7.8 mAh cm -2的超高面积容量厘米-2。该工作为促进锂硫电池的实际应用提供了一种新型隔膜。
更新日期：2023-06-27
中文翻译：
无定形植酸铁可实现高负载锂硫电池的快速多硫化物氧化还原
利用催化剂加速多硫化物转化对于消除穿梭效应并提高锂硫（Li-S）电池的实际性能至关重要。无定形归因于丰富的不饱和表面活性位点，最近被认为有助于提高催化剂的活性。然而，由于缺乏对锂硫电池组成结构活性的了解，对非晶态催化剂的研究在锂硫电池中的兴趣有限。在此，提出了一种无定形 Fe-Phytate 结构，通过改性聚丙烯隔膜（C-Fe-Phytate@PP）来增强多硫化物转化并抑制多硫化物穿梭。具有扭曲的VI配位Fe活性中心的极性Fe-Phytate通过形成Fe - S键强烈吸收多硫化物电子，加速多硫化物的转化。与碳相比，表面介导的多硫化物氧化还原产生更高的交换电流。此外，Fe-Phytate对多硫化物具有强大的吸附能力，有效降低穿梭效应。使用C-Fe-Phytate@PP隔膜，Li-S电池在5 C下表现出690 mAh g -1的出色倍率能力，即使在7.3 mg的高硫负载量下也表现出7.8 mAh cm -2的超高面积容量厘米-2。该工作为促进锂硫电池的实际应用提供了一种新型隔膜。
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