Impact of the NaClO4/NaPF6 salt ratio on the structure, mechanical and conductive properties of the PEO:(NaClO4)1−x(NaPF6)x solid polymer electrolyte†
Abstract
In this work, a comparative study of the solid polymer electrolytes (SPEs) PEO:(NaClO4)1−x(NaPF6)x was carried out. It was shown that the NaClO4/NaPF6 salt ratio can modify the phase composition, thermal behaviour, local structure, and mechanical and conductive properties of the SPEs. Increasing the NaPF6 content leads to the formation of an additional crystalline phase, PEO–NaPF6, which affects the number of free charge carriers according to the FTIR data. A non-linear change in the conductivity of the solid polymer electrolyte PEO12.5:(NaClO4)1−x(NaPF6)x was observed. For the compositions with x < 0.5, the change in conductivity was insignificant. When x > 0.5, a gradual decrease in conductivity was observed. It was shown that increasing the crystalline part of the SPE results in a significant improvement in the mechanical properties of the SPE. The study of the SPEs with different salt ratios allowed us to determine the range in which there is a significant increase in the mechanical strength of the SPE without loss of conductivity.
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