期刊
NANO LETTERS
卷 21, 期 22, 页码 9691-9698出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c03499
关键词
lithium-sulfur batteries; single-atom catalysts; Ni-N-5 active moiety; hollow nitrogen-doped porous carbon; polysulfides redox reaction
类别
资金
- China Postdoctoral Science Foundation [2019M663037]
- Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies [JJNY202006]
- Fundamental Research Funds of Shandong University [2019GN023]
- Guangdong Special Support Program [2017TQ04C800]
- Pengcheng Scholar Program
- Shenzhen Science and Technology Program [RCJC20200714114434086, KQTD2016053112042971, JCYJ20190808142001745, JCYJ20190808142209376]
- Science and Technology Key Project of Guangdong Province of China [2020B010188002]
- Electron Microscope Center, the Instrumental Analysis Center of Shenzhen University
- BL11B station in the Shanghai Synchrotron Radiation Facility (SSRF)
By constructing a multifunctional catalyst of isolated single-atom nickel in hollow nitrogen-doped porous carbon (Ni-N-5/HNPC), the performance of lithium-sulfur batteries has been successfully enhanced, including improved electrical conductivity, enhanced physical-chemical restriction capability towards lithium polysulfides, and boosted redox reaction kinetics.
Lithium-sulfur (Li-S) batteries suffer from multiple complex and often interwoven issues, such as the low electronic conductivity of sulfur and Li2S/Li2S2, shuttle effect, and sluggish electrochemical kinetics of lithium polysulfides (LiPSs). Guided by theoretical calculations, a multifunctional catalyst of isolated single-atom nickel in an optimal Ni-N-5 active moiety incorporated in hollow nitrogen-doped porous carbon (Ni-N-5/HNPC) is constructed and acts as an ideal host for a sulfur cathode. The host improved electrical conductivity, enhanced physical-chemical dual restricting capability toward LiPSs, and, more importantly, boosted the redox reaction kinetics by the Ni-N-5 active moiety. Therefore, the Ni-N-5/HNPC/S cathode exhibits superior rate performance, long-term cycling stability, and good areal capacity at high sulfur loading. This work highlights the important role of the coordination number of active centers in single-atom catalysts and provides a strategy to design a hollow nanoarchitecture with single-atom active sites for high-performance Li-S batteries.
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