20.500.12556/RUL-139458 Vpliv sestave elektrolita na elektrokemijsko delovanje negrafitiziranega ogljika v Na-ion akumulatorju Impact of electrolyte composition on electrochemical performance of non-graphitizable carbon in Na-ion battery 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. 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 negrafitizirani ogljiki elektrolit Na-ionski akumulatorji GITT Non-graphitizing carbons electrolyte Na-ion batteries GITT true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2022-09-02 11:55:00 2022-09-02 11:55:07 2022-10-07 12:39:05 0000-00-00 00:00:00 2022 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 21342 124719875 Jerovsek_Jan_-_Vpliv_sestave_elektrolita_na_elektrokemijsko_delovanje_negrafitiziranega_ogljika_.pdf Jerovsek_Jan_-_Vpliv_sestave_elektrolita_na_elektrokemijsko_delovanje_negrafitiziranega_ogljika_.pdf 1 F4848CADF5EE2F42A16B436F23BCA1FF 787b7c2599de1773fee7628e4dde8778f4f9339690a1fdb890725ada601cabe7 48bedba7-2aa5-11ed-92af-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=160027 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0