Polymer Electrolytes Based on Poly(ethylenimine)

该奖项的重点是开发具有非凡机械性能和高离子电导率的新型聚合物电解质。这个计划有两个不同的组成部分。(1)对简单的前体聚合物电解质进行一系列基础研究，重点关注控制离子电导率的关键因素；(2)开发具有优化机械和电气性能的可商业化聚合物电解质。基础研究解决了离子导电聚合物领域的一个严重问题，即在分子水平上对离子在这些系统中的传输机制知之甚少。研究的聚合物电解质是基于聚亚胺（PEI）。在工作的基础阶段，注意力将局限于用简单的线性PEI和烷基取代PEI制备的电解质，研究离子传输的重要因素，如阳离子-阴离子相互作用、离子-聚合物相互作用、聚合物相互作用和聚合物节段运动。这些材料将通过各种技术进行研究，主要是拉曼和红外振动光谱，辅以使用阻抗方法测量离子电导率。此外，还将使用DSC进行热表征和x射线衍射技术进行结构表征。基于pei的系统具有正确的合成多功能性，为优化理想的机械和导电性提供了非凡的可能性。这些研究的结果可能会导致一个新的离子导电聚合物家族的发展，作为“下一代”高能量密度锂可充电电池的电解质。

This award focuses on the development of a new family of polymer electrolytes with extraordinary mechanical properties and high ionic conductivities. This plan has two distinct components. (1) a series of fundamental studies of simple, precursor polymer electrolytes that focus on the critical factors controlling ionic conductivity, and (2) the development of a commercializable polymer electrolyte with optimized mechanical and electrical properties. The fundamental studies address a serious problem in the field of ion-conducting polymers, namely that the mechanism of ion transport in these system is as yet poorly understood at the molecular level. The polymer electrolytes proposed for study are based on poly(ethylenimine), PEI. In the fundamental phase of work, attention will be restricted to electrolytes prepared with simple linear PEI and alkyl-substituted PEI, examining the important factors underlying ionic transport such as cation-anion interaction, ion-polymer interactions, and polymer interactions, and polymer segmental motion. These materials will be studied by a variety of techniques, primarily Raman and infrared vibrational spectroscopy, complemented by measurements of ionic conductivity using impedance methods. In addition, thermal characterization with DSC and structural characterization with x-ray diffraction techniques will also be used. The right synthetic versatility available with PEI-based systems allows an extraordinary range of possibilities for the optimization of desirable mechanical and conductivity properties.The results of these studies may lead to the development of a new family of ion-conducting polymers for application as electrolytes in "next generation" high energy density lithium rechargeable batteries.