Titanium Disulfide Nanosheet-Based Electrodes For Flexible Zinc-Ion Micro-Batteries

Date

2026-3-6

Author

Öz, Sena

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The growing demand for miniaturized and flexible electronic systems requires compact and mechanically robust energy storage devices with realistic performance metrics. In this thesis, high-performance planar zinc - titanium disulfide (Zn–TiS₂) micro-batteries were developed using self-standing two-dimensional (2D) TiS₂ films as cathodes. A systematic material investigation was conducted, including a comparison between bulk and 2D TiS₂ and an evaluation of single-walled carbon nanotube (SWCNT) incorporation, enabling a rational material selection for the optimized micro-battery architecture. The 2D morphology demonstrated improved electrochemical accessibility and enhanced device-level performance compared to bulk counterparts. The self-standing films were patterned into micro-electrodes via laser cutting, and the influence of the laser process on the surface morphology and electrochemical behavior of both Zn and TiS₂ electrodes was examined. A Zn(BF₄)₂–ethylene glycol electrolyte was employed to ensure stable Zn reversibility and compatibility with the planar configuration. The optimized device achieved an areal capacity of 506.62 μAh cm⁻² (202.65 mAh cm⁻³), an energy density of 155.6 μWh cm⁻², and a power density of 0.56 mW cm⁻², with 82.4% capacity retention over 100 cycles. The micro-battery retained stable electrochemical performance under mechanical bending. Importantly, the device operated without external current collectors. By eliminating inactive dead volume and reporting performance based on total cathode thickness, this work presents realistic gravimetric and volumetric metrics suitable for space-constrained flexible and on-chip micro-electronic applications.

Subject Keywords

Zinc-Ion Micro-Batteries, Titanium Disulfide Nanosheets, Flexible Batteries, Two Dimensional Materials

URI

https://hdl.handle.net/11511/119024

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Graduate School of Natural and Applied Sciences, Thesis