Synthesis And Properties Of Sulfonated Polyamide Electrolyte

The current lithium-ion batteries are widely used in mobile devices, automotive, aerospace. Furthermore, the polymer lithium-ion battery is on behalf of the highest research level of lithium-ion battery and today’s hottest topic. Solid polymer electrolyte can effectively prevent liquid lithium-ion battery’s lithium dendritic growth, as well as fluid leaks, explosions and other shortcomings. As key materials of the polymer lithium ion batteries, the research of solid polymer electrolyte has an important significance. This article relates to the preparation of two new types of polymer electrolytes and the performance in the study.Firstly, monomers:butyl-2,2-bis[5-amino-benzoxazole] and 2,5-diamino-acid lithium were successfully prepared. With butyl-2,2-bis[5-amino-benzoxazole] and PEO-2COOH, organic lithium salt of 2,5-diamino-acid lithium, 5-sulfonic isophthalic lithium acid, we used copolymerization method and prepare five kinds of sulfonic acid-containing polyamide electrolyte I and II by adjusting the ratio of two monomers. We used infrared spectroscopy, nuclear magnetic resonance spectroscopy,DSC and TG to characterize structure and thermal properties of the polymer. Then we used solution casting method and successfully prepared the polyamide electrolyte membrane. Through EIS and stretching films, two types of polyamide electrolytes’ ionic conductivity and mechanical properties were determined.By differential scanning calorimetry analysis, we obtained that Tg of two kind of polyamide electrolyte increases by increasing the concentration of lithium salt. By TG analysis and comparison of the thermal stability, we obtained two types of electrolytes have good thermal stability. At room temperature, polyamide electrolyte I of 50% and polyamide electrolyte II of 30% had the highest ionic conductivity and I had better conductivity than the electrolyte II. By drawing two electrolyte membrane showed the components of the electrolyte membrane had certain mechanical properties, and by comparing the results: polyamide electrolyte II had superior mechanical properties than polyamide electrolyte I. The lithium salt concentration of 50% polyamide I was as a raw material for preparing the positive electrode of the battery. Finally, the two types of polyamide electrolyte membrane were assembled into the button battery. The charge and discharge properties were tested.