The thesis deals with polymer gel electrolytes (PGE), which are increasingly popular in portable electronic devices and electrical energy storage devices due to their safer use. The gel structure of PGEs reduces their flammability and prevents spillage. This makes them much safer to use than liquid electrolytes. Their main disadvantage is low conductivity, due to higher viscosity. PGE consist of a polymer matrix, a solvent and an electrolyte. The polymer matrix has the greatest influence on the mechanical properties of the PGE, which are mainly determined by the used polymer. The properties of the polymer matrix can be changed by the addition of plasticizers, so that small organic molecules affect the cohesive forces between the molecules. In the thesis, I investigated the influence of the concentration of the electrolyte, polymer, softener, and the influence of the molar mass of the polymer on the conductivity of PGE based on polyvinyl alcohol (PVA). The molar mass of PVA does not affect conductivity, while its concentration initially causes conductivity due to the movement of polymer chain segments, but later inhibits it due to higher viscosity. Electrolyte concentration also increases conductivity due to higher dissociation, but after reaching a peak at 0.66 g/L, it begins to decrease. The reason for this can be found in the reduction of dissociation at a high electrolyte concentration. The concentration of the plasticizer does not affect the conductivity, but its addition does, which increases the conductivity by a thousand.
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