Preparation And Properties Study Of Polymer Electrolytes For Lithium Ion Batteries

Solid state lithium ion battery has the advantages of high energy density, good cycle, high operating voltage, high output power, environment friendly, no memory effect, and so on,Now has entered into the lives of the people.As the key material of solid state lithium ion battery, polymer electrolyte is concerned by more and more scientists,But in terms of the current research results, the conductivity of polymer electrolytes is generally low. Aiming at the shortcoming of polymer electrolyte, In this paper, three kinds of novel polymer electrolytes were prepared and their properties were analyzed.This paper first successfully prepared sodium polystyrene sulfonate-polyethylene glycol methacrylate(PAS) polymer,By hydrogen nuclear magnetic resonance spectrum, infrared spectroscopy, electrochemical impedance spectroscopy and other test methods of polymer were characterized and analyzed, on the thermal stability and conductivity properties are analyzed, at the same time, the Na+/EO ratio on the conductivity of polymer PAS, thermal stability and mechanical properties of impact. Then based on the best Na+/EO ratio of prepared a series of different water EC groups of poly styrene sulfonic acid sodium- polyethylene glycol methacrylate and ethylene carbonate ethylene(PASE) and by proton nuclear magnetic resonance spectrum, infrared spectroscopy, electrochemical impedance spectroscopy, tensile testing thermal weight loss analysis and other testing methods has carried on the analysis of the thermal stability, mechanical properties and electrical conductivity of, and studies the EC group content on the conductivity of polymer pase, thermal stability and mechanical properties of impact. Based on the best Na+/EO ratio of prepared a series with different f groups of poly(styrene sulfonic acid sodium-polyethylene glycol methacrylate methacrylic acid hexafluoro butyl PASF, by hydrogen nuclear magnetic resonance spectrum, infrared spectroscopy, electrochemical impedance spectroscopy, tensile testing thermal weight loss analysis and other testing methods has carried on the analysis of the thermal stability, mechanical properties and electrical conductivity of, and containing F group content on the conductivity of polymer PASF, thermal stability and mechanical properties of impact. Finally through the dialysis method of polymer PASE and PASF was successfully transformed to lithium salt polymer polymer.By measuring the glass transition temperature of polymers by differential scanning calorimetry. The results showed that with the increase of flexible structure in the polymer structure, the glass transition temperature of polymers increased; by thermogravimetric analysis on the polymer thermal stability test, obtained by the preparation of polymer electrolyte has good thermal stability, can meet the actual needs use the electric conductivity; by AC impedance spectroscopy test of polymer electrolytes for polymer PAS, the ratio of Na+/EO to 1:9 has the highest conductivity, 2.67×10-7S/cm, the polymer PASE, the ionic conductivity increased with the reaction of ethylene carbonate and ethylene content increased, and the conductivity has a certain promotion on the first polymer PAS, reach 10-6 magnitude, the polymer PASF, the ionic conductivity as reactants in a The content of butyl acrylate six increased with the increase of the same, the resulting electrical conductivity for the polymer PAS has a certain degree of improvement, reaching 10-5 orders of magnitude. The tensile strength of polymer was measured by tensile test. The results show that the polymer electrolyte membrane has certain mechanical properties and can meet the needs of solid state polymer battery assembly.