Vpliv sestave elektrolita na elektrokemijsko delovanje negrafitiziranega ogljika v Na-ion akumulatorju

Jerovšek, Jan (avtor), Dominko, Robert (mentor)

Na-ionski akumulatorji zadnja leta pridobivajo na priljubljenosti zaradi potencialno nizke cene in relativno visoke energijske gostote. Kot anodni material so med najbolj priljubljenimi negrafitizirani ogljiki zaradi učinkovitega shranjevanja Na v strukturi in relativno nizkih stroškov sinteze. Ena izmed ključnih komponent pri shranjevanju natrija v negrafitiziranih ogljikih je elektrolit, katerega vloga je slabo raziskana. V diplomski nalogi smo z elektrokemijskimi analizami preučevali vpliv treh soli (NaPF6, NaFSI, NaTFSI) oziroma petih elektrolitov v organskih karbonatnih topilih na mobilnost Na-ionov in stabilnost akumulatorja z anodnim materialom iz negrafitiziranega ogljika. Za delo smo uporabili tehnike galvanostatske stopenjske titracije (GITT) in galvanostatskega praznjenja in polnjenja. Glede na eksperimentalne rezultate izstopata elektrolita, ki vsebujeta sol NaFSI, saj imata najvišje difuzijske koeficiente v stopnji polnjenja akumulatorja. Elektrokemijska analiza praznjenja in polnjenja je pokazala, da dodatek 0.1 M NaFSI soli v komercialnem 1 M NaPF6 v EC : DMC (1 : 1 vol. %) elektrolitu izkazuje najvišje kapacitete (270 mAh/g) Na-ionskega akumulatorja za izbrani anodni material in relativno stabilno delovanje z nizkimi izgubami kapacitete v opravljenih sedemdesetih ciklih.

• Jezik: Slovenski jezik
• Ključne besede: negrafitizirani ogljiki, elektrolit, Na-ionski akumulatorji, GITT
• 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-139458
• COBISS.SI-ID: 124719875
• Datum objave v RUL: 02.09.2022

JEROVŠEK, Jan, 2022, Vpliv sestave elektrolita na elektrokemijsko delovanje negrafitiziranega ogljika v Na-ion akumulatorju [na spletu]. Diplomsko delo. [Dostopano 25 julij 2025]. Pridobljeno s: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=slv&id=139458

Sekundarni jezik

• Jezik: Angleški jezik
• Naslov: Impact of electrolyte composition on electrochemical performance of non-graphitizable carbon in Na-ion battery

Izvleček

Na-ion batteries have been gaining in popularity in recent years due to their potentially low cost and relatively high energy density for large-scale applications. Non-graphitized carbons are among the most popular anodes for practical use in Na-ion batteries due to efficient Na storage and relatively low production costs, but the role of electrolytes in determining Na-ion capacity and binding mechanism is poorly studied. In this work, we systematically studied the influence of three sodium salts (NaPF6, NaFSI, NaTFSI) or five electrolytes in organic carbonate solvents EC and DMC on cycling stability and charge transfer kinetics of the non-graphitized carbon anode in Na-ion battery, using galvanostatic intermittent titration technique (GITT) and galvanostatic cycling. Based on the experimental data, the most promising electrolytes for the specific anode material are containing NaFSI salt. This was determined by the fact that these two electrolytes exhibit highest values of diffusion coefficients obtained by the GITT measurements. The addition of 0.1 M NaFSI in commercial 1 M NaPF6 in EC : DMC (1 : 1 vol. %) also exhibits the highest capacity (270 mAh/g) in the electrochemical analysis of galvanostatic cycling in addition to high capacity retention during 70 cycles

• Ključne besede: Non-graphitizing carbons, electrolyte, Na-ion batteries, GITT