Design And Application Of Polyacryloylmorpholine Based Ionogel

With the development of science and technology,flexible and multi-functional strain sensors have become common in wearable electronics.In addition,new energy vehicles using battery energy storage have also emerged in large numbers.Therefore,the role of ionogel in these fields gains a lot of attention.Ionogel is a gel mainly composed of ionic liquid and substrate materials,with excellent ionic conductivity,wide operating temperature range and high thermal/chemical stability.It owns great application potential in flexible sensing,energy conversion and energy storage.There are thousands of ionic liquids and polymers for targeted functionalization of different systems.In this article,ACMO was employed as polymer monomer to prepare ionogel with imidazolyl based ionic liquid.The following two points were studied:（1）A high performance ionogel was prepared by polymerization of ACMO with Imidazolyl-ionic liquid（EMIMTFSI）and characterized as a flexible strain sensor.（2）A solid electrolyte for lithium metal battery was prepared by copolymerization of ACMO monomer,ionic liquid（EMIMTFSI）and poly（ionic liquid）（VEIM TFSI）in the presence of lithium salt（Li FSI）.The diffusion behavior of lithium ion in solid electrolyte was studied,and the performance of corresponding battery was tested.The specific content of the article is divided into the following four parts:The first chapter is the introduction.The origin and development history of ionic liquids,the composition,classification and preparation methods of ionogel are introduced,and the applications of ionogel in flexible sensing and lithium battery are summarized.In chapter 2,ionogel was prepared by in-situ photopolymerization of ACMO and ionic liquid EMIMTFSI.The characteristics of the ionogel,such as transparency,mechanical properties,adhesion,temperature range and environmental stability were characterized.Compared with traditional ionogel,as prepared ionic gels render good elastic properties,which can be used as skin type flexible strain sensor with good response sensitivity,excellent repeatability and durability.In addition,the ionogel is environmentally friendly and can be recycled after use.In chapter 3,ACMO was used as monomer in the presence of lithium salt（Li FSI）to copolymerize with poly（ionic liquid）（VEIMTFSI）and ionic liquid（EMIMTFSI）,and the obtained ionogel was used as solid state electrolyte for lithium metal batteries.It is found that :（1）There is a coordination structure between lithium ion and carbonyl group（lithium bond）.The coordination structure of lithium ion and carbonyl group is varied with different lithium content.The ionic conductivity increased when the coordination between lithium ion and carbonyl group becomes weaker.（2）After introducing the poly（ionic liquid）VEIMTFSI,the coordination between carbonyl group of PACMO and lithium ion can be significantly weakened,thus further accelerating the diffusion of lithium ion to obtain a solid state lithium battery with higher performance.The fourth chapter is a summary of the work in this article including the performance of ionogel as flexible sensor and solid electrolyte,with the analysis for the innovation and deficiency of the article.