Researchers from the Centre for Nano and Soft Matter Sciences (CeNS), Bengaluru, an autonomous institution of Department of Science and Technology (DST), synthesised sulfur vacancy-induced 1T-phase Molybdenum Disulfide (1T-MoS₂), a material that promises to make zinc batteries more viable for large-scale grid storage.
The team comprising Mr. Ganesh Mahendra, Dr. Rahuldeb Roy, and Dr. Ashutosh Kumar Singh, used a carefully controlled hydrothermal method to produce sulphur deficient 1T-phase MoS₂ nanoflakes. This metallic-phase material possesses a high surface area and enhanced conductivity, which facilitates faster electrochemical reactions and greater charge storage.
A critical aspect of their work was a systematic study to optimize electrochemical potential window—the voltage range within which the battery operates stably. They identified 0.2 to 1.3 Volts (vs. Zn²⁺/Zn) as the ideal operational window. This optimization was pivotal in achieving exceptional performance metrics.
The fabricated zinc-ion battery demonstrated remarkable cyclic stability, retaining 97.91% of its initial capacity after 500 continuous charge-discharge cycles at a high current density of 1 A g⁻¹. The device exhibited a Coulombic efficiency of 99.7%, indicating highly reversible zinc-ion insertion and extraction with minimal side reactions. The research team used this to successfully power a commercial LCD timer using a coin-cell prototype, showcasing the material’s potential in real-world applications.
The research work which was published in the journal of Energy & Fuels under American Chemical Society (ACS) Publishers, provides a comprehensive roadmap for designing high-performance cathode materials. The breakthrough can help us make affordable, safe and efficient batteries that could store massive amount of renewable energy on the grid.
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