针对锂离子电池聚烯烃隔膜存在的润湿性差的问题，本项目以功能型两亲共聚物的概念和特点为启发，结合共混膜中存在的“环境诱导”和“表面偏析”现象来实现共混两亲共聚物中功能链段对聚烯烃隔膜的改性。通过考察两亲共聚物的性质及改性隔膜成膜过程中各制膜条件的变化对共混隔膜微观相结构及组成分布的影响，深入研究共混改性隔膜中功能链段的表面偏析行为及内在机理，以实现共混隔膜表面组成的可控及隔膜润湿性的有效改善，使改性效果最佳化。本项目还进一步以组成分布明确可控的改性隔膜为模型，研究功能链段在隔膜表面的分布状态对隔膜与电极的界面稳定性及锂离子电池的充放电行为的影响规律，为高性能共混隔膜的设计和开发奠定理论基础。本项目对丰富与发展膜科学理论和技术，发展高性能隔膜的制备技术及隔膜/凝胶聚合物电解质在锂离子电池中的应用方法具有重要意义。

To overcome the poor wettability of polyolefin separator with liquid electrolyte in lithium ion battery, functional amphiphilic copolymer will be blended into the polyolefin matrix for separator modification based on "environment-induced" and "surface segregation" phenomenon. The influences of the properties of amphiphilic copolymer and preparation conditions of the blend separator on separator phase structure and chemical composition distribution will be studied in-depth. And the evolution and control mechanism of the surface segregation behavior of functional segments will be explored to achieve a controlled surface chemical composition for the blended separator and an improved wettability and to make the modification effect optimization. Based on the above background, separators with controllable micro-structure and chemical composition distribution could be obtained. The research project will further study the relationship of the surface distribution of the functional segments with the interfacial stability between the separator and the electrodes in lithium ion battery and the electrochemical performances of the lithium ion battery, which could provide theoretical basis for the designation and development of high-performance blend separators. The findings have important implications for the development of membrane science and technology, preparation technology of high-performance separator and the application method for separator/gel polymer electrolyte in lithium ion battery.