Three-dimensional graphene network-supported Co, N-codoped porous carbon nanocages as free-standing polysulfides mediator for lithium-sulfur batteries
作者:Wang, RR (Wang, Ruirui)[ 1 ] ; Chen, ZL (Chen, Ziliang)[ 1 ] ; Sun, YQ (Sun, Yuqing)[ 1 ] ; Chang, C (Chang, Cheng)[ 3 ] ; Ding, CF (Ding, Chaofan)[ 1 ] ; Wu, RB (Wu, Renbing)[ 1,2 ]
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CHEMICAL ENGINEERING JOURNAL
卷: 399
文献号: 125686
DOI: 10.1016/j.cej.2020.125686
出版年: NOV 1 2020
文献类型:Article
摘要
Construction of sulfur host with high immobilization ability and catalytic effect towards polysulfide intermediates is of great significance to boost the electrochemical performance of lithium-sulfur (Li-S) batteries. Herein, for the first time, a free-standing sulfur host consisting of cobalt and nitrogen co-doped porous carbon nanocages supported by reduced graphene oxide (Co/N-PCN@rGO) is synthesized via a calcination of graphene-supported cobalt-based zeolitic imidazolate framework precursor and, followed by etching treatment. After a melt infiltration process, the sulfur can be uniformly confined within the Co/N-PCN@rGO host (Co/N-PCN@ rGO@S). When employed as the free-standing cathode material for Li-S batteries, the achieved Co/N-PCN@ rGO@S not only shows an exceptional initial discharge capacity of 1290 mA h g(-1) at 0.2 C, but also keeps a capacity of 640 mA h g(-1) over 500 cycles at 1.0 C with a fading rate of only 0.066% per cycle. In addition, the high rate test also confirms its superior rate capability with a high capacity of 880 mA h g(-1) at 2 C. Such outstanding performance can be attributed to the synergism of the integrated conducive network, the favorable surface structures of carbon framework as well as its strong charge coupling with Co and N species, ensuring an enhanced electron transfer kinetics, increased sulfur utilization, and improved immobilization and catalytic ability towards polysulfide intermediates.
关键词
作者关键词:Co, N-codoped porous carbon nanocages; Polysulfides mediator; Free-standing; Lithium-sulfur batteries
KeyWords Plus:HIGH-PERFORMANCE; ELECTROCHEMICAL PROPERTIES; CATHODE; ARCHITECTURES; CONVERSION; NANOSHEETS; FOAM; NANORODS; HYBRIDS; REDOX
作者信息
通讯作者地址:
Fudan University Fudan Univ, Dept Mat Sci, Shanghai 200433, Peoples R China.
通讯作者地址: Wu, RB (通讯作者)
显示更多Fudan Univ, Dept Mat Sci, Shanghai 200433, Peoples R China.
地址:
显示更多[ 1 ] Fudan Univ, Dept Mat Sci, Shanghai 200433, Peoples R China
显示更多[ 2 ] South China Univ Technol, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, Peoples R China
显示更多[ 3 ] Fudan Univ, Dept Macromol Sci, Shanghai 200433, Peoples R China
电子邮件地址:rbwu@fudan.edu.cn
基金资助致谢
基金资助机构显示详情授权号
National Natural Science Foundation of China (NSFC)
51871060
51672049
51831009
Open Fund of the Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, and Recruit Program of Global Youth Experts and Fudan's Undergraduate Research Opportunities Program (FDUROP)
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出版商
ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND
期刊信息
Impact Factor (影响因子): Journal Citation Reports
类别 / 分类
研究方向:Engineering
Web of Science 类别:Engineering, Environmental; Engineering, Chemical