Experimental Research On Synthesis And Properties Of4-(Dicyanomethylene) Croconate Electrolyte For Lithium-ion Batteries

Fossil fuel taking petroleum, natural gas and coal as the main energy source over a long period of time can cause serious environmental pollution and make unreasonable energy structure. So lithium-ion battery as a clean and renewable energy source came into being. Now, with the rapid development in production technology and battery materials, the performance of lithium-ion battery continues to improve, including rate performance, high and low temperature performance, security, cycle performance and so on. Thus, the lithium-ion battery has been quickly promoted in multiple application fields.The choice of materials determines the performance of the battery. Therefore, the development of new materials is very important to promote the development of battery technology. On the one hand, high energy density, fast discharge and high stability of the electrode material need to be developed. On the other hand, a safe and reliable electrolyte is hoped to appear and take the place of the organic electrolyte existed nowadays. The composition of the electrolyte is one of the key factors affecting the performance of lithium batteries, so the appropriate electrolyte had been explored. This paper searched a series of new lithium battery electrolyte with good electrochemical properties.The thesis is divided into three chapters.In the first chapter, on the based of the general investigation of literatures, many lithium borates with big π key are described in order to make up molecular designer, self-assembly more easily.In the second chapter, the lithium salts which including TBC、TBT、TBCO. They were characterized by IR, NMR, elemental analysis.In the third chapter, electrochemical properties of lithium borates salts with derivative of croconic acid were studied. We mainly analysis the properties of the lithium salts in solubility, electrical conductivity, ICP, thermal stability, oxidation potential aspects. The electrochemical and thermodynamic aspects of the features were also studied.In summary, three organic lithium salts are synthesized, their structures and properties have been studied.