一类主链上含有多π单元的单离子型聚合物电解质的合成及其电池性能研究

项目名称： 一类主链上含有多π单元的单离子型聚合物电解质的合成及其电池性能研究

项目编号： No.21504084

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 曾丹黎

作者单位： 中国地质大学（武汉）

项目金额： 21万元

中文摘要： 理论和实验表明，采用具有优良锂离子迁移数（接近或等于1）的单离子传导型聚合物电解质的锂离子二次电池可以获得更高的电池效率。为此，申请人提出将已被广泛研究的液态有机小分子电解质双草酸硼锂(LiBOB)的结构和单离子型聚合物电解质的概念有机结合起来，制备一系列以sp3杂化硼为高分子主链联结中心、芳/杂芳环单元为联结臂的一维或者多维网络结构的聚合物。配体中共轭分子的参与不仅可使硼原子上的负电荷分布更加分散，其刚性骨架还可支撑起聚合物多孔结构，从而促进该类聚合物电解质中锂离子的离解，进而获得高的电导率。我们在对合成方法进行探索、优化的同时，还将深入研究基于此类聚合物电解质的锂离子二次电池的各项电化学性能，探索构效关系的规律。本项目旨在为发展高效、清洁、安全的电源提供结构更加丰富，性能更加优异的单离子聚合物电解质，具有基础科研和实际应用的双重价值。

中文关键词： 单离子聚合物电解质；聚合物锂离子电池；共轭；锂离子迁移数；聚合物网络结构

英文摘要： Higher cell efficiency can be achieved by using single-ion conducting polymer electrolyte, which has a particular high lithium-ion transference number (unity or approaching to unity), for lithium-ion secondary batteries, theoretically and experimentally. Here, we proposed to develop a series of new polymer electrolytes with a well studied organic liquid electrolyte molecule structure (LiBOB) combined to the concept of the single ion conducting polymer electrolyte. The sp3 hybridized boron act as link center, coupling with π-conjugated ligand units in the polymer back bones, so the one-dimensional or multi-dimensional polymer networks can be formed. The π-conjugated ligand not only can better disperse the distribution of the negative charge on the boron atoms, but its rigid structure can also lead to a porous polymer skeleton, resulted in an increase to lithium-ion dissociation, and conductivity as well. We go exploring and optimizing the method of synthesis, while also in-depth study of the electrochemical properties of these polymer electrolytes for lithium-ion secondary batteries, and summer up the law between performance and structure. This project aims to provide a series of new single-ion conducting polymer electrolytes for developing efficient, clean andsafe power supply with variety of structures and excellent performance, having special importance on both scientific research and practical applications.

英文关键词： single ion polymer electrolyte ;lithium ion polymer battery;π-conjugated;transference number;polymer networks