一种新型骨架材料在高性能锂硫电池中的应用
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- 英文论文题名：A Novel Skeleton Material for High-Performance Li-S Batteries
- 论文作者：李艺娟 ; 范镜敏 ; 郑明森 ; 董全峰
- 英文论文作者：Yi-juan Li ; Jing-min Fan ; Ming-sen Zheng ; Quan-feng Dong ; State Key Lab.of Physical Chemistry of Solid Surfaces ; Department of Chemistry ; College of Chemistry and Chemical Engineering ; Xiamen University
- 年：2016
- 作者机构：厦门大学化学化工学院化学系固体表面物理化学重点实验室;
- 论文关键词：多孔碳氮复合物空心管 ; 导电骨架 ; 穿梭效应 ; 锂硫电池
- 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-第三十分会：化学电源
- 语种：中文
- 分类号：TM912;TB332
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十分会 ; 化学电源
- 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：171k
- 原文格式：D
- 会议级别：全国
摘要
锂硫电池因具有高能量密度,价格低廉以及环境友好等而被视为具有潜力的电化学能源存储体系之一,然而硫的电导率极低,由多硫化物的"穿梭效应"引起的容量衰减严重制约着锂硫电池的应用发展~([1][2])。在此,本文在多孔碳氮复合物材料(ZIF-8-700)的研究基础上,通过模板法(以氧化锌为模板)构筑了一种新型的多孔碳氮复合物空心管(t-ZNC)作为锂硫电池的导电骨架材料,该材料具有很高的比表面积(500m~2/g)及丰富的孔道,极大地提高了对多硫化物的吸附性能,从而有效地抑制了多硫化物的"穿梭效应",使锂硫电池的循环性能和倍率性能大为提升。在硫负载量为70%的情况下,与S/ZIF-8-700复合材料相比,S/t-ZNC复合材料在不同倍率下的容量均有不同程度的提高,特别是在高倍率下,其电化学性能差别更大,此外,S/t-ZNC复合材料在不同倍率下的循环性能大大提高,在1C倍率下循环500圈的循环保持率高达93.6%。这为开发和设计最具有应用潜力的锂硫电池导电骨架材料提供了思路。
The rechargeable Lithium-Sulfur battery has been regarded as a promising option for electrochemical-energy storage systems owing to its high energy density,low cost and environmental friendliness.The further development of Li-S battery,however,is still impeded by capacity decay caused by the polysulfide shuttle.Herein,a novel skeleton material was synthesized,in which an ideal electronic matrix and entrapping for polysulfide were synchronously achieved successfully and hence improve the Li-S performance significantly.The large surface area(500 m~2/g) and abundant micropores were apt to entrapping intermediate polysulfides.With a high sulfur loading of70 wt%,the S/t-ZNC composite can operate at 1C over 500 cycles with a high capacity retention of 93.6%and exhibited outstanding high-rate response up to 2C.
The rechargeable Lithium-Sulfur battery has been regarded as a promising option for electrochemical-energy storage systems owing to its high energy density,low cost and environmental friendliness.The further development of Li-S battery,however,is still impeded by capacity decay caused by the polysulfide shuttle.Herein,a novel skeleton material was synthesized,in which an ideal electronic matrix and entrapping for polysulfide were synchronously achieved successfully and hence improve the Li-S performance significantly.The large surface area(500 m~2/g) and abundant micropores were apt to entrapping intermediate polysulfides.With a high sulfur loading of70 wt%,the S/t-ZNC composite can operate at 1C over 500 cycles with a high capacity retention of 93.6%and exhibited outstanding high-rate response up to 2C.
引文
[1]P.G.Brace,S.A.Freunberger,L.J.Hardwick,J.M.Tarascon,Nat.Mater.,2012,11:19-29.
[2]Wang X.,Zhang Z.,Qu Y.,Lai Y.,Li J.,J.Power Sources,2014,256:361-368.
[2]Wang X.,Zhang Z.,Qu Y.,Lai Y.,Li J.,J.Power Sources,2014,256:361-368.