Polimerni gelski elektroliti

Kovačič, Blaž (avtor), Šebenik, Urška (mentor)

Diplomska naloga obravnava polimerne gelske elektrolite (PGE), ki so zaradi varnejše uporabe, vedno bolj popularni pri prenosnih elektronskih napravah in napravah za shranjevanje električne energije. Gelska struktura PGE zmanjša njihovo vnetljivost in onemogoča razlitje. S tem postanejo veliko bolj varni za uporabo od tekočih elektrolitov. Njihova glavna slabost je nizka prevodnost, zaradi višje viskoznosti. Sestavljeni so iz polimerne matrike, topila in elektrolita. Polimerna matrika ima največji vpliv na mehanske lastnosti PGE, ki so pogojene predvsem z uporabljenim polimerom. Lastnosti polimerne matrike lahko spremeni dodatek mehčal. To so majhne organske molekule, ki vplivajo na kohezijske sile med molekulami. V diplomski nalogi sem preiskoval vpliv koncentracije elektrolita, polimera, mehčala in vpliv molske mase polimera na prevodnost PGE na osnovi polivinil alkohola (PVA). Molska masa PVA na prevodnost ne vpliva, medtem ko njena koncentracija v začetku zaradi gibanja segmentov polimernih verig povečuje prevodnost, kasneje pa jo zaradi višje viskoznosti zavira. Koncentracija elektrolita zaradi višje disociacije prav tako zvišuje prevodnost, po doseženem vrhu pri 0,66 g/L pa jo začne zavirati. Razlog za to najdemo v znižanju disociacije ob veliki koncentraciji elektrolita. Koncentracija mehčala na prevodnost ne vpliva, vpliva pa njegov dodatek, ki tisočkrat zviša prevodnost.

• Jezik: Slovenski jezik
• Ključne besede: polimerni gelski elektrolit, polivinil alkohol, prevodnost
• Vrsta gradiva: Diplomsko delo/naloga
• Tipologija: 2.11 - Diplomsko delo
• Organizacija: FKKT - Fakulteta za kemijo in kemijsko tehnologijo
• Leto izida: 2022
• PID: 20.500.12556/RUL-141862
• COBISS.SI-ID: 132892163
• Datum objave v RUL: 10.10.2022

KOVAČIČ, Blaž, 2022, Polimerni gelski elektroliti [na spletu]. Diplomsko delo. [Dostopano 5 maj 2025]. Pridobljeno s: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=slv&id=141862

Sekundarni jezik

• Jezik: Angleški jezik
• Naslov: Polymer gel electrolytes

Izvleček

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.

• Ključne besede: polymer gel electrolyte, polyvinyl alcohol, conductivity