Study of In-situ Gel Polymer Electrolyte with Epoxidized Soybean Oil and Lithiumbis(fluorosulfonyl)imide (LiFSI) by Lithium Ion Batteries
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Liquid lithium batteries are one of the most used secondary cell batteries and have high energy density and low temperature characteristics. However, when using a liquid electrolyte, there is a high possibility of a fire accident due to low thermal stability. Therefore, many researchers study solid polymers (SE) and polymer electrolytes (PE) with good thermal stability. However, in the case of SE and PE, the interelectrode resistance is high and the ionic conductivity is low. Interfacial resistance can be lowered if in-situ polymerization is used to compensate for this disadvantage. A mixture of monomer, lithium salt and solvent is injected into the battery cell and the electrolyte polymerizes under certain external conditions. In our study, epoxidized soybean oil, an eco-friendly material, was mixed with LiFSI and produced using in-situ polymerization. The synthesized PE is studied by FT-IR, and the thermal properties of the polymer are analyzed by TGA and DSC.