Xiuling Zhang, Jiaying Zhang, Yun Feng, Linkun Shen, Xiangyu Cao, Lu Liu, Juanzhi Yan
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引用次数: 0
摘要
锂硫电池作为储能系统前景广阔,但多硫化锂(LiPS)的穿梭效应和较大的体积变化限制了其容量和循环寿命。我们通过简单的共聚和热解,开发出了包裹在掺氮多孔碳球(e-CF@NC)中的具有核壳结构的 CoFe 合金。掺氮多孔碳壳提供了电子和离子传输通道以及更多的电解质离子吸附活性位点。化学稳定性高的碳可以限制多硫化物的偏析,进一步提高电池的循环稳定性。此外,内部的 CoFe 合金颗粒可催化 LiPS 和 Li2S 之间的转化,加快反应动力学并减少活性位点的溶解。因此,以 e-CF@NC-2 为正极的锂硫电池在 0.1 摄氏度时的初始比容量高达 1146 mA h g-1,具有优异的速率性能(1 摄氏度时为 891 mA h g-1,2 摄氏度时为 741 mA h g-1)和良好的循环稳定性(在 1 摄氏度下循环 300 次,每次循环的平均容量衰减率为 0.033%),显示出巨大的应用潜力。
Core-shell cobalt-iron@N-doped carbon: A high-performance cathode material for lithium-sulfur batteries.
Lithium-sulfur batteries hold great promise as energy storage systems, but the shuttle effect of lithium polysulfides (LiPS) and large volume variation limit their capacity and cycle life. We have developed CoFe alloy wrapped in N-doped porous carbon spheres (e-CF@NC) with a core-shell structure through simple copolymerization and pyrolysis. The nitrogen-doped porous carbon shell provides electron and ion transport channels and more active sites for electrolyte ion adsorption. The high chemically stable carbon can limit the segregation of polysulfides, further improving the battery cycling stability. Besides, the inside CoFe alloy particles catalyze the conversion between LiPS and Li2S, speeding up reaction kinetics and reducing solvation of active sites. Consequently, lithium-sulfur batteries with e-CF@NC-2 as the cathode display a high initial specific capacity of 1146 mA h g-1 at 0.1 C, excellent rate performance (891 mA h g-1 at 1 C, 741 mA h g-1 at 2 C), and satisfied cycle stability (average capacity decay rate of 0.033% per cycle at 1 C for 300 cycles), demonstrating significant application potential.
期刊介绍:
The Journal of Chemical Physics publishes quantitative and rigorous science of long-lasting value in methods and applications of chemical physics. The Journal also publishes brief Communications of significant new findings, Perspectives on the latest advances in the field, and Special Topic issues. The Journal focuses on innovative research in experimental and theoretical areas of chemical physics, including spectroscopy, dynamics, kinetics, statistical mechanics, and quantum mechanics. In addition, topical areas such as polymers, soft matter, materials, surfaces/interfaces, and systems of biological relevance are of increasing importance.
Topical coverage includes:
Theoretical Methods and Algorithms
Advanced Experimental Techniques
Atoms, Molecules, and Clusters
Liquids, Glasses, and Crystals
Surfaces, Interfaces, and Materials
Polymers and Soft Matter
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