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学术讲座:锂-空气电池材料发展所面临的主要挑战
2019-03-18 08:13:28


Dr. Daniil M. Itkis   莫斯科国立大学化学系电化学储能中心高级研究员(课题组长为Prof. Eugene A. Goodilin,俄罗斯科学院院士),主要研究方向为新型锂电池储能体系、氧还原电催化剂、纳米无机氧化物材料以及固态电解质,包括利用软化学方法合成多级纳米结构的正负极材料、电极结构和微观形貌分析、原位光谱技术用于电极过程动力学研究,目前已发表论文60篇,会议报告51篇,出版专业书籍2部,拥有专利17项。2008年和2009年分别获得莫斯科青年科学家奖(Moscow State University Young Scientist Award),2016年获俄罗斯国家青年科学家奖(Russia Government Award for Young Scientists,年度授予人数50名左右)。

时间:319日(星期二)10:00-12:00

地点:仲英楼pt老虎机第一会议室

Lithium-oxygen chemistry can potentially enable development of rechargeable batteries demonstrating a few-fold increased specific energy in comparison to lithium-ion ones. The practical implementation of this idea, however, faces a number of significant challenges. The first one is the problem of positive electrode material stability during cycling. During lithium-air battery (LAB) operation oxygen reduction reaction occurs at the positive electrode – oxygen dissolved in the electrolyte is reduced to superoxide (O2-), which forms ionic pairs with Li+ (LiO2). Such intermediates are then converted to a final discharge product lithium peroxide (Li2O2) after transfer of second electron from the electrode or by chemical disproportionation reaction. Unfortunately, oxygen reduction products and intermediates are highly reactive species that can attack both electrolyte solvents and electrode materials. Among others, carbon materials received major attention as a positive electrode in Li–O2 cells as they are freely available, porous, highly conductive and lightweight. The requirements for porous positive electrodes and their chemical stability would be discussed in the talk using carbon materials and Ti-based conductive compounds as examples. Application of a number of neutron and synchrotron- based tools (neutron reflectometry, XPS/NAP XPS and others) for monitoring the interfacial processes at positive electrodes will be demonstrated.






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