标题:Selenium/interconnected porous hollow carbon bubbles composites as the cathodes of Li-Se batteries with high performance
作者:Zhang, Jingjing; Fan, Long; Zhu, Yongchun; Xu, Yanhua; Liang, Jianwen; Wei, Denghu; Qian, Yitai
作者机构:[Zhang, Jingjing; Fan, Long; Zhu, Yongchun; Xu, Yanhua; Liang, Jianwen; Wei, Denghu; Qian, Yitai] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Mi 更多
通讯作者:Zhu, Yongchun
通讯作者地址:[Zhu, YC]Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China.
来源:NANOSCALE
出版年:2014
卷:6
期:21
页码:12952-12957
DOI:10.1039/c4nr03705g
摘要:A kind of Se/C nanocomposite is fabricated by dispersing selenium in interconnected porous hollow carbon bubbles (PHCBs) via a melt-diffusion method. Such PHCBs are composed of porous hollow carbon spheres with a size of similar to 70 nm and shells of similar to 12 nm thickness interconnected to each other. Instrumental analysis shows that the porous shell of the PHCBs could effectively disperse and sequester most of the selenium, while the inner cavity remains hollow. When evaluated as cathode materials in a carbonate-based electrolyte for Li-Se batteries, the Se/PHCBs composites exhibit significantly excellent cycling performance and a high rate capability. Especially, the Se/PHCBs composite with an optimal content of similar to 50 wt% selenium (Se-50/PHCBs) displays a reversible discharge capacity of 606.3 mA h g(-1) after 120 cycles at 0.1 C charge-discharge rate. As the current density increased from 0.1 to 1 C (678 mA g(-1)), the reversible capacity of the Se-50/PHCBs composite can still reach 64% of the theoretical capacity (431.9 mA h g(-1)). These outstanding electrochemical features should be attributed to effective sequestration of Se in the PHCBs, as well as to the ability to accommodate volume variation and enhance the electronic transport by making Se have close contact with the carbon framework.
收录类别:EI;SCOPUS;SCIE
WOS核心被引频次:52
Scopus被引频次:51
资源类型:期刊论文
原文链接:https://www.scopus.com/inward/record.uri?eid=2-s2.0-84908010602&doi=10.1039%2fc4nr03705g&partnerID=40&md5=32f5424b7fcb870e0676358dd47f5a09
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