DEVELOPMENT OF COMPOSITE ANODE ELECTRODES CONTAINING METAL OXIDE-N DOPED REDUCED GRAPHENE OXIDE FOR LITHIUMION BATTERIES
Project no. 32298 · Status: Kapanmış (Yayın bekleniyor) · 2024
Summary
<p>In this master's thesis, composite anode materials were developed for lithium-ion batteries</p><p>by synthesizing different metal oxide compounds (MnO₂, NiO, V₂O₅) and combining them in</p><p>specific ratios with nitrogen-doped graphene oxide (N-GO) prepared via the modified</p><p>Hummers method. The morphological, chemical, and electrical properties of the synthesized</p><p>composites were characterized using scanning electron microscopy (SEM), X-ray</p><p>photoelectron spectroscopy (XPS), X-ray diffraction (XRD), raman spectroscopy (RS), and</p><p>electrochemical impedance spectroscopy (EIS).Subsequently, graphite, graphene oxide (GO),</p><p>N-doped NiO/GO, N-doped V₂O₅/GO, N-doped MnO₂/GO, and N-doped binary NiO/V₂O₅/GO</p><p>composite materials were used as anode electrodes to fabricate prototype lithium-ion battery</p><p>cells. The performance tests of the prototypes were conducted under laboratory conditions.</p><p>When the charge/discharge capacities, cycle performance, and cyclic voltammograms of the</p><p>lithium-ion battery anode test cells were compared, it was found that the N-GO/NiO/V₂O₅</p><p>hybrid composite anode (20 wt% N-GO, 40 wt% NiO, 40 wt% V₂O₅) delivered an initial</p><p>capacity of approximately 350 mAh/g at a low current density (1 mA) and was still able to</p><p>retain around 100 mAh/g even after 50 cycles at a high current density (10 mA). These results</p><p>demonstrate that the hybrid structure provides superior properties in terms of ion conductivity</p><p>and structural stability.</p>