期刊
NANOSCALE HORIZONS
卷 5, 期 4, 页码 720-729出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nh00663j
关键词
-
资金
- National Natural Science Foundation of China [51901031, 51931006]
- NSF of Fujian Province, China [2017J01103]
- National Key R&D Program of China [2016YFA0202602]
- Fundamental Research Funds for the Central Universities of China (Xiamen University) [20720190013]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515011070]
- Double-First Class'' Foundation of Materials and Intelligent Manufacturing Discipline of Xiamen University
Spatial confinement is a desirable successful strategy to trap sulfur within its porous host and has been widely applied in lithium-sulfur (Li-S) batteries. However, physical confinement alone is currently not enough to reduce the lithium polysulfide (Li2Sn, 4 <= n <= 8, LIPSs) shuttle effect with sluggish LIPS-dissolving kinetics. In this work, we have integrated spatial confinement with a polar catalyst, and designed a three-dimensional (3D) interconnected, Co decorated and N doped porous carbon nanofiber (Co/N-PCNF) network. This Co/N-PCNF film serves as a freestanding host for sulfur trapping, which could effectively facilitate the infiltration of electrolyte and electron transport. In addition, the polar Co species possess strong chemisorption with LIPSs, catalyzing their reaction kinetics as well. As a result of this rational design and integration, the Co/N-PCNF@S cathode with a sulfur loading of 2 mg cm(-2) exhibits a high initial discharge capacity of 878 mA h g(-1) at 1C, and maintains a discharge capacity of 728 mA h g(-1) after 200 cycles. Even with high sulfur loading of 9.33 mg cm(-2), the cathode still keeps a stable areal capacity of 7.16 mA h cm(-2) at 0.2C after 100 cycles, which is much higher than the current areal capacity (4 mA h cm(-2)) of commercialized lithium-ion batteries (LIBs). This rational design may provide a new approach for future development of high-density Li-S batteries with high sulfur loading.
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