Manufacturing of TiS2 Electrode Active Material for Zinc Ion Capacitor Applications

Date

2024-9-06

Author

Kandur Bağlıcakoğlu, Sümeyye

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Capacitors offer high power density, superior cycle stability, and fast charging, making them highly promising for energy storage. However, their energy density needs to be improved. Hybrid capacitors, which combine capacitor and battery electrodes, have emerged as a viable solution by merging the advantages of both technologies. Due to zinc's abundance, low cost, high capacity, and stability, aqueous zinc-ion capacitors have garnered significant attention. Zinc-ion capacitors face challenges such as rapid capacity decrease and reduced lifespan due to strong electrostatic interactions, electrode material dissolution, and sluggish ionic diffusion. Bulk titanium disulfide (TiS2) has been investigated as an electrode material to overcome these disadvantages, but the effects of its two-dimensional (2D) structure have remained elusive. This thesis aims to synthesize bulk TiS₂ and convert it into 2D metallically conductive TiS₂ nanosheets using organolithium chemistry, optimizing it as a zinc-ion capacitor electrode material to enhance energy density in a 2 M zinc sulfate (ZnSO₄) electrolyte. The 2D-TiS₂ exhibited a specific capacitance of 214.3 F/g, significantly outperforming bulk TiS₂, which achieved a specific capacitance of 73.86 F/g. This work highlights the potential of 2D-TiS₂ to enhance the energy density of zinc-ion capacitors through improved electrical conductivity and phase stabilization, offering a pathway to more efficient energy storage solutions.

Subject Keywords

electrochemistry, capacitor, titanium disulfide(TiS2), transition metal dichalcogenides(TMD)

URI

https://hdl.handle.net/11511/111532

Collections

Graduate School of Natural and Applied Sciences, Thesis