Research On The Gel Polymer Electrolyte Of Lithium Ion Battery

Li ion battery is a new type of storage battery developing in the 1980s.It is called environmental and green battery because of higher energy density,better electronic conductivity,smaller size,better circulation and no pollutant.As the electronic equipments follow the way of microminiaturization and portable type,the orientation of the development of batteries will also keep up with this pace in the future.Therefore,this lays the foundation for the development of high energy density and microminiaturization of Li ion battery.Polymer electrolyte membrane,a new material of batteries,has excellent advantages.As polymer electrolyte membrane has the better function of machinery process,it can provide conducting medium for a variety of lithium ion battery.Therefore,it keeps the electronic equipments developing featuring microminiaturization and portable type.It also plays an important role in many fields such as photo electrochemistry,electricity,medicine and health care.It can provide storage energy of high energy density for the new type of environmental electronic motors and put into practice with the characteristics,such as better heatproof and electrical conductivity.Li ion polymer electrolyte will be new,effective,environmentally-friendly energy.In this paper,we prepared the liquiduse of PP13TFSI,PP14TFSI,PY13TFSI by in-situ polymerization,and further synthesized lithium ion gel type polymer film of PMMA/PP13TFSI/LiTFSI,PMMA/PP14TFSI/LiTFSI,and PMMA/PY13 TFSI/LiTFSI.SEM was used to analyze the surface morphology of the three kinds of lithium ion gel type polymer films.TG was used to analyze the decomposition temperature of lithium ion gel type polymer films.The three kinds of lithium ion gel type polymer films were used to assemble into button cell and then we used LSV,CV,chronoamperometry,constant current and EIS to analyze electrochemical properties.The results showed that the three kinds of lithium ion gel type polymer films began to decompose at 380 ?,and completely decomposed at 480 ?.The ionic liquid polymer film conductivity reached 10-4 S/cm,the order of conductivity was:PP14TFSI>PY13TFSI>PP13TFSI electrochemical window values range from 0 V to 5 V.Corresponding to the standard of preparing button cell,they all had good performance of the charge and discharge,the cycle efficiency was higher than 90%.