离子液体微观结构及其锂离子电池体系的原位透射电镜研究

项目名称： 离子液体微观结构及其锂离子电池体系的原位透射电镜研究

项目编号： No.21276257

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 化学工业

项目作者： 陈仕谋

作者单位： 中国科学院过程工程研究所

项目金额： 78万元

中文摘要： 作为一类新型介质，离子液体在催化、分离、润滑、电化学、生物质转化等诸多领域展现出优异的应用前景，在这些领域中离子液体的微观结构起决定性作用，但目前对其微观结构特性的认识还很有限。高分辨透射电镜是一种在纳米尺度、分子水平上研究材料微观结构的强有力工具。本项目拟采取从一维空间到二维薄膜再到本体这种自下而上的研究策略，利用高分辨电镜探测多尺度下离子液体的微观结构、分子排列和相变行为等，了解离子液体的本质。在此基础上，考虑到近年来离子液体已被广泛用于新型锂离子电池的开发，然而在其应用过程中很多科学问题尚不清楚。我们将在高分辨透射电镜内部构筑以离子液体为电解质的锂离子电池原位表征系统，在线监测在电池充放电过程中，离子液体电解质的微观结构和物化行为。结合电化学方法和其他波谱技术，深入考察该体系的表界面科学问题、动态过程和微观机制，为开发离子液体在锂离子电池领域中的应用提供指导。

中文关键词： 离子液体；微观结构；原位；锂离子电池；

英文摘要： Room-temperature ionic liquids are a special class of liquids solely composed of cations and anions. Even though bulk properties of ionic liquids are still under intense investigations, the study of the microstructure of ionic liquids in low dimensional system is an exciting challenge and has attracted great attention due to their relevance in catalytic processes, separation, lubricants, electrochemistry, lubricants, biomass conversion, etc. High resolution transmission electron microscopy (HRTEM) is a powerful technique for probing the structure of materials deep into nanometer scale and molecular level. Unfortunately, the normal molecular liquid samples preclude any direct HRTEM observations due to their volatilities. Ionic liquids are unique liquid materials with almost zero vapor pressure, Thus they are ideal liquid samples which can be characterized by HRTEM directly. In this project, we design a bottom-up approach to insight into the microstructure of ionic liquid. We will carry out the in-situ HRTEM observations on a series of ionic liquids in 1D space, 2D thin film states and bulk phase. The microstructure, packing fashion and phase behavior of ionic liquids will be studied systematically. It is anticipated to explore not only the new concepts on liquid behavior in nanoscale, but also a solid understandi

英文关键词： ionic liquid；microstructure；in situ；lithium ion battery；