20.500.12556/RUL-171346 Modeliranje degradacijskih procesov v Li-ionskih baterijah na ravni elektrodnega delca Modelling of degradation processes in Li-ion batteries at the electrode particle level V nalogi smo vzpostavili elektrokemijski model transporta litijevih ionov na ravni posameznega aktivnega delca grafitne anode z vključenimi modeli degradacijskih mehanizmov. Model vsebuje podmodela difuzije litija in elektrokemijske reakcije po Butler-Volmerjevi enačbi ter dva degradacijska podmodela: tvorba plasti med trdnino in elektrolitom (plast SEI) ter tvorba litijevih prevlek (ang. \textit{lithium plating}). Sistem nelinearnih diferencialnih enačb smo diskretizirali z metodo končnih volumnov in ga reševali v programskem jeziku C s paketom IDA, knjižnice SUNDIALS. Rezultati kažejo, da rast plasti SEI med cikli polnjenja in praznjenja postopoma poveča notranji upor baterije, pri višjih hitrostih polnjenja in praznjenja pa se na površini anode tvori debelejša plast litijeve prevleke, kar pospeši elektrokemijsko degradacijo in zmanjša zmogljivost. In this work, we developed an electrochemical model of lithium‑ion transport at the single active‑particle level in a graphite anode with included models of degradation mechanisms. The model comprises submodels for lithium diffusion and Butler–Volmer electrochemical kinetics, as well as two degradation mechanisms: growth of the solid electrolyte interphase (SEI) and lithium plating. We discretized the resulting system of nonlinear differential equations using the finite‑volume method and solved it in C with the IDA solver from the SUNDIALS library. The results show that SEI growth during charge–discharge cycles gradually increases the battery’s internal resistance, while higher charge/discharge rates promote formation of a thicker lithium plating layer on the anode surface, accelerating electrochemical degradation and reducing performance. li-ionske baterije difuzija elektrodni delci degradacija plast SEI oplaščanje z litijem li-ion batteries diffusion electrode particles degradation SEI film lithium plating true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2025-08-23 08:30:50 2025-08-23 08:30:59 2025-08-30 03:49:26 0000-00-00 00:00:00 2025 0 0 XIX, 71 2025 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.352:544.6(043.2) 274643 246776835 42935.pdf 42935.pdf 1 4180BF696760681B83B91B20DF9FC8C5 0687fa951db54d4fb94205592fe4f47aff03407f39b048e17992d6502f221b87 a1e947c1-7fea-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=214632 Fakulteta za strojništvo 0 0 0