Ion dynamics and charge transport in ultrathin films of polymerized ionic liquids

聚合离子液体超薄膜中的离子动力学和电荷传输

基本信息

批准号：
1508394
负责人：
Joshua Sangoro
金额：
$ 34.8万
依托单位：
University of Tennessee Knoxville
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2015
资助国家：
美国
起止时间：
2015-07-01 至 2018-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1508394&HistoricalAwards=false
关键词：
Ion dynamics charge transport ultrathin

项目摘要

NON-TECHNICAL SUMMARY:The rising energy needs of the modern society continue to provide a significant impetus for extensive research and development in energy storage devices. Polymer electrolytes play a key role in these devices. This project will employ specialized electrical experiments to gain deeper understanding of the impact of the confinement of the molecules within extrememly thin films and their interactions with surfaces on their electrical and mechanical properties. This fundamental understanding will be useful in guiding the design of novel functional polymer electrolytes with desirable properties for sustainable technologies, including polymerized ionic liquids for portable batteries, solar cells, fuel cells, actuators, field-effect transistors, and electrochromic devices. The information regarding the interplay between molecular structure, polymer/substrate interactions, ion transport and dynamics in thin films of polymerized ionic liquids gained from this work will be beneficial not only within the field of ionic liquids but also to the polymer science and engineering scientific communities. An important component of this project also involves several integrated educational activities. The project will contribute to training and education of specialists in polymer nanotechnology and materials science through active involvement of graduate and undergraduate students in this research. This integrated research/educational program also emphasizes work with underrepresented groups and outreach to K-12 students.TECHNICAL SUMMARY:Polymerized ionic liquids are a novel class of functional polymers that combine the unique physicochemical properties of molecular ionic liquids (e.g. wide electrochemical windows, negligible vapor pressures, and ionic conduction) with the outstanding mechanical characteristics of polymers. These materials are promising for a variety of applications including dye-sensitized solar cells, portable batteries, actuators, field-effect transistors and electrochromic devices. Many of these technologies involve the use of polymerized ionic liquids confined in one dimension as thin films. However, fundamental understanding of the impact of one-dimensional nanoscale confinement on ion transport and dynamics in polymerized ionic liquids is still very limited. The main goal of this research is to unravel the mechanisms controlling charge transport and ion dynamics in ultrathin films of polymerized ionic liquids. The project will focus on: (i) investigating the impact of film thickness on ion conduction and dynamics in polymerized ionic liquids, (ii) unraveling the role of the polymer/substrate interactions on ion transport and dynamics, and (iii) investigating the role of chemical composition/structure on ion dynamics and charge transport in thin films of polymerized ionic liquids. The research will primarialy utilize broadband dielectric spectroscopy measurements of thin polymer films using a recently developed electrode configuration featuring silica nanostructures and an air gap. The detailed fundamental understanding of the impact of one-dimensional confinement on ion transport and dynamics gained in these studies will provide a firm scientific basis for design of more efficient polymer electrolytes suitable for potential use in electrochemical power sources and devices.

非技术摘要：现代社会的能源需求不断提高，继续为储能设备的广泛研究和开发提供了重要的动力。聚合物电解质在这些设备中起关键作用。该项目将采用专门的电气实验，以更深入地了解分子在极端薄膜中的限制的影响及其在其电气和机械性能上与表面的相互作用。这种基本的理解将有助于指导具有可持续技术的理想特性的新型功能聚合物电解质，包括用于便携式电池，太阳能电池，燃料电池，燃料电池，致动器，现场效应晶体管和电染色器设备的聚合离子液体。有关分子结构，聚合物/底物相互作用，离子传输和动力学之间相互作用的信息，从这项工作中获得的聚合离子液体的薄膜中，不仅在离子液体领域，而且对聚合物科学和工程科学群落都有益。该项目的重要组成部分还涉及几项综合的教育活动。该项目将通过积极参与研究生和本科生参与这项研究的聚合物纳米技术和材料科学的培训和教育。这项综合研究/教育计划还强调了代表性不足的群体和向K-12学生进行宣传的工作。技术摘要：聚合的离子液体是一类新型的功能性聚合物，它们结合了分子离子液体的独特物理化学特性（例如，范围广泛的电化学液体的特征，均可降低了vapor prolim and ionic and ictions and ionic and ion ictions and ion ictions and ion ictions and ion ictions and ion ictions and ion ictions and ion iction ion icion and ion。这些材料对于各种应用都是有希望的，包括染料敏化的太阳能电池，便携式电池，执行器，野外效应晶体管和电染色器设备。这些技术中的许多涉及使用限制在一个尺寸的薄膜的聚合离子液体的使用。然而，对一维纳米级限制对聚合离子液体中离子运输和动力学的影响的基本了解仍然非常有限。这项研究的主要目的是阐明聚合离子液体超薄膜中控制电荷传输和离子动力学的机制。该项目将重点介绍：（i）研究膜厚度对聚合离子液体离子传导和动态的影响，（ii）阐明聚合物/底物相互作用对离子传输和动力学的作用，以及（iii）研究化学组成/结构对薄膜中化学组成/结构的作用，对薄膜中的薄膜中的电荷转运。这项研究将使用新近开发的电极构型对薄聚合物膜进行宽带介电光谱测量，该构型具有二氧化硅纳米结构和气隙。对这些研究中一维限制对离子运输和动力学的影响的详细基本理解将为设计更有效的聚合物电解质的设计提供牢固的科学基础，适合于在电化学能源和设备中潜在使用。