Improving Performance of Li-ion batteries with modification the composition of electrolyte with Poly (methyl methacrylate)

Modification of electrolyte composition, with ionic liquid, one of the ways that is used to improving the performance of Li-ion batteries. In this research the Poly (methyl methacrylate)(PMMA) with different weight percentage ۰%, ۱%, ۳% and ۵% w .w-۱used as additive electrolyte for improve the performance of ۱۸۶۵۰ Li-ion battery. The electrochemical tests like galvanostatic charge/ discharge and Electrochemical Impedance Spectroscopy (EIS) are used for finding the optimum value of additive. Based on electrochemical data, the sample that contain ۱% w .w-۱PMMA additive, show the best result in environment temperature conditions. The sample with ۱% w .w-۱ of additive, after ۱۰۰ cycle charge/discharge in environment temperature has more maintain capacity in comparison with the bare sample. The Electrochemical Impedance Spectroscopy (EIS) was done in ۰.۰۵ Hz to ۱۰۰ kHz frequency range, in the first cycle and after ۵۰, ۱۰۰, and ۲۰۰ cycles for all samples.The EIS data confirm the improvement in diffusion coefficient Li-ion in the electrolyte that contains PMMA additive.The EIS data for all samples simulated with equivalent circuit and confirm other electrochemical data.