材料科学
复合数
电解质
锂(药物)
电化学
化学工程
介孔材料
碳纤维
阳极
法拉第效率
储能
石墨
碳化
石墨烯
碳纳米管
复合材料
电极
化学
催化作用
有机化学
物理化学
内分泌学
工程类
医学
作者
Chao Luo,Yunhua Xu,Yujie Zhu,Yihang Liu,Shiyou Zheng,Ying Liu,Alex Langrock,Chongmin Wang
出处
期刊:ACS Nano
[American Chemical Society]
日期:2013-08-19
卷期号:7 (9): 8003-8010
被引量:354
摘要
Selenium-impregnated carbon composites were synthesized by infusing Se into mesoporous carbon at a temperature of 600 °C under vacuum. Ring-structured Se8 was produced and confined in the mesoporous carbon, which acts as an electronic conductive matrix. During the electrochemical process in low-cost LiPF6/EC/DEC electrolyte, low-order polyselenide intermediates formed and were stabilized by mesoporous carbon, which avoided the shuttle reaction of polyselenides. Exceptional electrochemical performance of Se/mesoporous carbon composites was demonstrated in both Li-ion and Na-ion batteries. In lithium-ion batteries, Se8/mesoporous carbon composite cathodes delivered a reversible capacity of 480 mAh g(-1) for 1000 charge/discharge cycles without any capacity loss, while in Na-ion batteries, it provided initial capacity of 485 mAh g(-1) and retained 340 mAh g(-1) after 380 cycles. The Se8/mesoporous carbon composites also showed excellent rate capability. As the current density increased from 0.1 to 5 C, the capacity retained about 46% in Li-ion batteries and 34% in Na-ion batteries.
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