三维多孔N掺杂石墨烯/硫正极材料在锂硫电池中的应用
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- 英文论文题名：A 3D porous N-doped graphene/sulfur composite as cathode for lithium sulfur batteries
- 论文作者：刘双科 ; 洪晓斌 ; 谢凯
- 英文论文作者：Shuangke Liu ; Xiaobin Hong ; Kai Xie ; College of Aerospace Science and engineering ; National University of Denfense Technology
- 年：2016
- 作者机构：国防科学技术大学航天科学与工程学院能源材料教研室;
- 论文关键词：锂硫 ; 石墨烯 ; 三维 ; 多孔 ; 循环
- 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：TB33;TM912
- 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：2
- 文件大小：235k
- 原文格式：D
- 会议级别：全国
摘要
由于硫的能量密度高、硫资源丰富廉价、对环境污染小,锂硫电池在过去十几年里被广泛研究,作为下一代电动交通工具的候选动力电源被寄予厚望。目前锂硫电池存在的主要问题之一是循环寿命短,而这主要是由于硫的放电过程中形成的聚硫锂发生溶解和飞梭以及产生的体积变化~([1,2]),为了解决这些问题,研究人员将硫与不同类型、不同结构和状态的碳进行复合来改善其循环性能。石墨烯由于具有大的比表面积、灵活的化学调控和形貌构建特性,在锂硫电池中得到了广泛的研究应用。研究表面,对石墨烯进行元素掺杂、构建三维网络结构有助于提高锂硫正极的电化学性能~([3,4])。本文以吡咯为氮源,对氧化石墨烯进行水热自组装制备了三维多孔N掺杂石墨烯材料,并通过熔融法与硫进行复合,结果表明,由于具有均匀的N掺杂、丰富的孔结构和三维导电网络骨架,所得的硫正极具有优异的循环性能,在1C倍率下500次循环后容量保持率为76.7%。
Due to the high energy density,natural abundance and environmental friendliness of sulfur cathod,the lithium sulfur batteries have been widely studied in the last several years,and are regarded as promising candidate power sources for next generation electric vehicles.However,one of the main problems restricting their practical application is the short cycle life of lithium sulfur batteries,which is mainly caused by the dissolution and shuttle of lithium polysulfides and volume expansion generated during charge-discharge process of sulfur cathode.To address these issues,people conbine sulfur with carbon of different type and structure to improve the cycling performance.Graphene,with large specific surface area,flexible chemical and morphology tailoring characteristics,is widely applied in lithium sulfur batteries.Element doping and 3D nanostrucure designing of graphene was proved helpful to improve the electrochemical performance of lithium sulfur batteries.Herein,a 3D porous N-doping graphene was prepared by hydrothermal self-assembly method using pyrrole as N sources,after infiltered with sulfur by melt-diffusion method,the graphene/sulfur cathode demonstrate excellent cycling performance with 76.7%capacity retention after 500 cycles at 1C.The long cycle life of the battery is ascibed to the homogenous N-doping,abundant pore structure and 3D conductive networks.
Due to the high energy density,natural abundance and environmental friendliness of sulfur cathod,the lithium sulfur batteries have been widely studied in the last several years,and are regarded as promising candidate power sources for next generation electric vehicles.However,one of the main problems restricting their practical application is the short cycle life of lithium sulfur batteries,which is mainly caused by the dissolution and shuttle of lithium polysulfides and volume expansion generated during charge-discharge process of sulfur cathode.To address these issues,people conbine sulfur with carbon of different type and structure to improve the cycling performance.Graphene,with large specific surface area,flexible chemical and morphology tailoring characteristics,is widely applied in lithium sulfur batteries.Element doping and 3D nanostrucure designing of graphene was proved helpful to improve the electrochemical performance of lithium sulfur batteries.Herein,a 3D porous N-doping graphene was prepared by hydrothermal self-assembly method using pyrrole as N sources,after infiltered with sulfur by melt-diffusion method,the graphene/sulfur cathode demonstrate excellent cycling performance with 76.7%capacity retention after 500 cycles at 1C.The long cycle life of the battery is ascibed to the homogenous N-doping,abundant pore structure and 3D conductive networks.
引文
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