期刊
ADVANCED ENERGY MATERIALS
卷 11, 期 5, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202003507
关键词
atomically dispersed iron; electrocatalytic polysulfide conversion; lithium– sulfur batteries; organic layered materials
类别
资金
- Severo Ochoa program from Spanish MINECO [SEV-2017-0706]
- CERCA Programme/Generalitat de Catalunya
- European Union [823717-ESTEEM3, 665919]
- Severo Ochoa Programme
- MINECO SO-FPT PhD grant [SEV-2013-0295-17-1]
- European Regional Development Funds
- Spanish MINECO [ENE2016-77798-C4-3-R, ENE2017-85087-C3]
- China Scholarship Council
- Alexander von Humboldt Foundation
- China Postdoctoral Science Foundation [2019M663468]
- Generalitat de Catalunya [2017SGR327, 2017SGR1246]
This study reports on the use of 2D layered organic material, C2N, loaded with atomically dispersed iron as an effective sulfur host in lithium-sulfur batteries (LSBs), which shows significantly improved rate performance and long-term cycling stability. The Fe/C2N-based cathodes exhibit high initial capacities and maintain remarkable specific capacity retention even after multiple cycles at high rates.
Lithium-sulfur batteries (LSBs) are considered to be one of the most promising next generation energy storage systems due to their high energy density and low material cost. However, there are still some challenges for the commercialization of LSBs, such as the sluggish redox reaction kinetics and the shuttle effect of lithium polysulfides (LiPS). Here a 2D layered organic material, C2N, loaded with atomically dispersed iron as an effective sulfur host in LSBs is reported. X-ray absorption fine spectroscopy and density functional theory calculations prove the structure of the atomically dispersed Fe/C2N catalyst. As a result, Fe/C2N-based cathodes demonstrate significantly improved rate performance and long-term cycling stability. Fe/C2N-based cathodes display initial capacities up to 1540 mAh g(-1) at 0.1 C and 678.7 mAh g(-1) at 5 C, while retaining 496.5 mAh g(-1) after 2600 cycles at 3 C with a decay rate as low as 0.013% per cycle. Even at a high sulfur loading of 3 mg cm(-2), they deliver remarkable specific capacity retention of 587 mAh g(-1) after 500 cycles at 1 C. This work provides a rational structural design strategy for the development of high-performance cathodes based on atomically dispersed catalysts for LSBs.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据