Method for manufacturing metallic 1T-phase molybdenum disulfide using solvothermal synthesis

High-ratio metallic 1T-phase molybdenum disulfide electrode material based on one-pot solvothermal synthesis in ethanol

This technology is a manufacturing method for supercapacitor electrode materials that produces petal-like molybdenum disulfide nanostructures (MP-LN) dominated by the metallic 1T phase via one-pot solvothermal synthesis, involving mixing sodium molybdate, thioacetamide, and hexamethyldisilazane in an ethanol-deionized water solvent at room temperature, followed by heating in an autoclave.

Supercapacitor performance is highly dependent on electrode materials; however, molybdenum disulfide produced via conventional water-based hydrothermal synthesis suffers from low conductivity due to a high proportion of the semiconducting 2H phase and difficulty in controlling surface area. There have been few cases of applying metallic 1T-phase materials produced via solvothermal synthesis to electrodes, and limitations have existed regarding large-scale synthesis.

This technology maximizes surface area through a petal-like 3D structure while selectively securing a high ratio of the highly conductive 1T phase, thereby enhancing specific capacitance, cycle stability, and reversibility. It can be applied to high-output energy storage devices for hybrid electric vehicles, portable electronics, and power tools, enabling the mass production of high-performance supercapacitor electrodes through a simple and scalable process.

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Key Features:

• Adding Na2MoO4·2H2O to a mixed solvent of ethanol and deionized water, followed by the addition and stirring of C2H5NS and hexamethyldisilazane at room temperature. Sealing the stirred solution in an autoclave, heating it in an electric oven, and cooling it to room temperature to collect the precipitate. Washing the precipitate with deionized water and ethanol, and drying it in a hot-air oven to obtain metallic 1T-phase molybdenum disulfide petal-like nanostructures. A supercapacitor electrode comprising high-ratio 1T-phase molybdenum disulfide as an active material, further including a conductive agent and a binder.

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This invention was developed with support from the Ministry of Education, Science and Technology for the project on low-dimensional transition metal chalcogen-aligned CNT-based nanostructure heterojunctions and wafer-scale smart sensor applications.

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