锂电池材料的结构设计与原位电化学反应机理研究
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- 英文论文题名：Structure design of Li battery materials and in-situ electrochemical mechanism
- 论文作者：晏成林
- 英文论文作者：Chenglin Yan ; School of energy ; Soochow University
- 年：2016
- 作者机构：苏州大学能源学院;
- 论文关键词：锂电池 ; 机理研究 ; 结构设计
- 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
- 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：112k
- 原文格式：D
- 会议级别：全国
摘要
锂硫电池因具有较高的理论比能量而成为目前最具开发前景的二次电池体系之一。但在实际应用过程中依然面临诸多挑战。如聚硫化物在电解质中的溶解问题、硫化锂的绝缘性问题、锂负极枝晶问题等都亟待解决。在我们前期工作中,通过新颖的卷曲法组装单根微米管锂离子电池器件[1,2],并将其应用于锂电池的原位机理研究[3,4]。在任一充放电状态下,实现单根微米管电池的微区拉曼光谱、电子输运性能的原位表征;通过俄歇电子能谱和电化学阻抗研究了单根Si微米管锂电池SEI膜的形成电位、组成和厚度、嵌脱锂反应界面特性对锂电性能造成的影响[5]。在锂硫电池研究方面,主要通过分子结构设计聚硫化合物,并采用共价键的方式将硫及其放电产生的多硫化物固定,减少或限制多硫化物的溶解,从而提高电池性能。另外,我们将介绍原位电化学分析手段如原位XRD、原位紫外光谱、原位同步辐射光谱研究共价键结构调控锂硫电池性能的机理,并辅以DFT证实其电化学作用机理。
Lithium-sulfur batteries are considered to be one of the most promising secondary battery system at present due to their high theoretical specific capacity and theoretical specific energy.However,widespread practical applications for rechargeable lithium-sulfur batteries are plagued with many problems.In our previous work,the single Si microtube battery was fabricated by rolled-up method,and will be applied to the study of the SEI formation and its properties.The formation voltage,interface composition and depth profile,Li-ion intercalation and de-intercalation interface reaction,and properties of SEI layers will be explored,and the effect on the performance of lithium ion battery will be discussed as well.In terms of lithium sulfur batteries,we molecular modification of polysulfide structure was designed and the covalent effect on the performance improvement was carried out.The mechanism of using in-situ technology such as in-situ XRD,UV-Vis,and in-situ XANS was explored,which is further confirmed by DFT calculations.
Lithium-sulfur batteries are considered to be one of the most promising secondary battery system at present due to their high theoretical specific capacity and theoretical specific energy.However,widespread practical applications for rechargeable lithium-sulfur batteries are plagued with many problems.In our previous work,the single Si microtube battery was fabricated by rolled-up method,and will be applied to the study of the SEI formation and its properties.The formation voltage,interface composition and depth profile,Li-ion intercalation and de-intercalation interface reaction,and properties of SEI layers will be explored,and the effect on the performance of lithium ion battery will be discussed as well.In terms of lithium sulfur batteries,we molecular modification of polysulfide structure was designed and the covalent effect on the performance improvement was carried out.The mechanism of using in-situ technology such as in-situ XRD,UV-Vis,and in-situ XANS was explored,which is further confirmed by DFT calculations.
引文
[1]Wang Xianfu;Chen Yu;Schmidt Oliver G;Yan Chenglin*,Chem.Soc.Rev.,2016,45,1308-1330.
[2]Si Wenping;Moench Ingolf;Yan Chenglin*,Schmidt Oliver G,Advanced Materials,2014,26,7973-7978.
[3]Zhang Ling*,Deng Junwen,Liu Lifeng,Si Wenping,Yan Chenglin*,Schmidt Oliver G,Advanced Materials,2014,26,4527-4532.
[4]Yan Chenglin*;Xi Wang;Si Wenping,Schmidt Oliver G,Advanced Materials,2013,25,539-544.
[5]Deng Junwen;Ji Hengxing;Yan Chenglin*,Schmidt Oliver G,Angewandte Chemie-International Edition,2013,125,2382-2330.
[2]Si Wenping;Moench Ingolf;Yan Chenglin*,Schmidt Oliver G,Advanced Materials,2014,26,7973-7978.
[3]Zhang Ling*,Deng Junwen,Liu Lifeng,Si Wenping,Yan Chenglin*,Schmidt Oliver G,Advanced Materials,2014,26,4527-4532.
[4]Yan Chenglin*;Xi Wang;Si Wenping,Schmidt Oliver G,Advanced Materials,2013,25,539-544.
[5]Deng Junwen;Ji Hengxing;Yan Chenglin*,Schmidt Oliver G,Angewandte Chemie-International Edition,2013,125,2382-2330.