介观结构碳纳米笼限域的S@C复合材料的构建及其锂硫电池性能
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- 英文论文题名：Hierarchical carbon nanocages confining high-loading sulfur for high-rate lithium–sulfur batteries
- 论文作者：刘晨霞 ; 吕之阳 ; 杨立军 ; 吴强 ; 王喜章 ; 胡征
- 英文论文作者：Chenxia Liu ; Zhiyang Lyu ; Lijun Yang ; Qiang Wu ; Xizhang Wang ; Zheng Hu ; Key Laboratory of Mesoscopic Chemistry of MOE ; School of Chemistry and Chemical Engineering ; Nanjing University
- 年：2016
- 作者机构：介观化学教育部重点实验室南京大学化学化工学院;
- 论文关键词：介观结构碳纳米笼 ; 高硫载量 ; 限域作用 ; 锂硫电池 ; 高倍率性能
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第四十二分会：能源纳米材料物理化学
- 语种：中文
- 分类号：TM912
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第四十二分会 ; 能源纳米材料物理化学
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：255k
- 原文格式：D
- 会议级别：全国
摘要
锂硫电池商业化应用的瓶颈是活性物质利用率低和循环寿命短,这主要源自硫的低导电性和多硫化物的溶解~([1])。以具有大孔体积、优异导电性和多孔网络构型的介观结构碳纳米笼(hCNC)为载体,通过高温熔融扩散法将硫注入到碳笼内腔,获得了硫担载量高达79.8wt%的新型S@C复合物,增强了S的导电性,减少多硫化物的流失,解决了S电极导电性差、性能易衰减的难题,表现出比容量大、倍率性能好、循环寿命长等优点。在1 A g~(-1)的电流密度下经过300圈循环后,放电比容量仍可达到558 mAh g~(-1);在3 A g~(-1)的高电流密度下充电6分钟即可获得300 mAh g~(-1)的比容量,能量密度可达到218 Wh kg~(-1)(高于目前锂离子电池的能量密度),并能稳定循环500圈,有望使电池充电时间从小时缩短到分钟~([2])。
Lithium–sulfur batteries are suffered from low utilization of sulfur, short cycle life and poor rate capability. Herein we report a new kind of carbon–sulfur composites by infusing sulfur into the novel hierarchical carbon nanocages(hCNC) with high pore volume, network geometry and good conductivity. The designed S@hCNC composite with a high sulfur loading of 79.8wt % presents the large capacity, high-rate capability and long cycle life. The excellent performance derives from the unique mesostructure of hCNC which alleviates polysulfide dissolution, meanwhile much enhances the electron conduction and Li-ion diffusion.
Lithium–sulfur batteries are suffered from low utilization of sulfur, short cycle life and poor rate capability. Herein we report a new kind of carbon–sulfur composites by infusing sulfur into the novel hierarchical carbon nanocages(hCNC) with high pore volume, network geometry and good conductivity. The designed S@hCNC composite with a high sulfur loading of 79.8wt % presents the large capacity, high-rate capability and long cycle life. The excellent performance derives from the unique mesostructure of hCNC which alleviates polysulfide dissolution, meanwhile much enhances the electron conduction and Li-ion diffusion.
引文
[1]Hassoun,J.;Scrosati,B.Angew.Chem.Int.Ed.2010,49,2371.
[2]Lyu,Z,Y;Xu,D.;Yang,L,J;Che,R.C.;Feng,R.;Zhao,J.;Li,Y.;Wu,Q.;Wang,X.Z.;Hu,Z.Nano Energy.2015,12:657.
[2]Lyu,Z,Y;Xu,D.;Yang,L,J;Che,R.C.;Feng,R.;Zhao,J.;Li,Y.;Wu,Q.;Wang,X.Z.;Hu,Z.Nano Energy.2015,12:657.