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周小四副教授和包建春教授课题组在JOURNAL OF MATERIALS CHEMISTRY A发表研究论文

发布时间:17-08-04 14:39:58 文章来源:1 浏览次数: [ 字号:


Uniformly-distributed Sb nanoparticles in ionic liquid-derived nitrogen-enriched carbon for highly reversible sodium storage
Xu, X (Xu, Xin)[ 1 ] ; Dou, ZF (Dou, Zhifeng)[ 2 ] ; Gu, EL (Gu, Erlong)[ 1 ] ; Si, L (Si, Ling)[ 1 ] ; Zhou, XS (Zhou, Xiaosi)[ 1 ]*(周小四); Bao, JC (Bao, Jianchun)[ 1 ]*(包建春)

[ 1 ] Nanjing Normal Univ, Sch Chem & Mat Sci, Jiangsu Collaborat Innovat Ctr Biomed Funct Mat, Jiangsu Key Lab New Power Batteries, Nanjing 210023, Jiangsu, Peoples R China
[ 2 ] Hainan Univ, Coll Mat & Chem Engn, State Key Lab Marine Resource Utilizat South Chin, Haikou 570228, Peoples R China

JOURNAL OF MATERIALS CHEMISTRY A,201707,5(26), 13411-13420

Antinomy (Sb) has received considerable attention as one of the most promising anode materials for sodium-ion batteries (SIBs) because of its high theoretical capacity and suitable working voltage. However, the large volume change of Sb during the alloying/dealloying process causes poor cycling stability and low rate capability, which hinder its practical application. Here, we substantially enhance the sodium storage performance of Sb by binding Sb nanoparticles in ionic liquid-derived nitrogen-enriched carbon (Sb@NC) via pyrolysis of an SbCl3/1-ethyl-3-methylimidazolium dicyanamide mixture. The Sb@NC composite exhibits a high reversible capacity of 440 mA h g(-1) at a current density of 100 mA g(-1), superior rate performance of 285 and 237 mA h g(-1) at the high current densities of 2 and 5 A g(-1), respectively, and greatly improved cycle life of 328 mA h g(-1) at the current density of 100 A g(-1) after 300 cycles in the half cell of SIBs. In the full cell, the energy density of Sb@NC//Na3V2(PO4)(3)/C is approximately 147 W h kg(-1) at a power density of 50 W kg(-1). Even at 2.37 kW kg(-1), an energy density of around 65 W h kg(-1) is still retained. The remarkably improved electrochemical performance could be assigned to the synergistic effect of nanoscale size, uniform distribution, and chemical coupling effect between Sb and ionic liquid-derived nitrogen-enriched carbon.


文章链接:
http://pubs.rsc.org/en/Content/ArticleLanding/2017/TA/C7TA03434B#!divAbstract
 


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