This technology introduces the Water-Assisted Solid-State Reaction (WASSR) method to synthesize Zn3V2O7(OH)2·2H2O, a cathode material for aqueous zinc-ion batteries (AZIBs). By using a small amount of water to facilitate diffusion between reactants, it enables the production of single-phase materials at temperatures below 100°C, replacing conventional high-temperature, high-pressure hydrothermal synthesis.
While hydrothermal synthesis is effective for controlling nanostructures in high-performance vanadium oxide cathodes, it requires high-temperature and high-pressure processes. This creates significant challenges for mass production and limits economic viability.
This technology involves mixing Zn(OH)2 and V2O5, adding a small amount of distilled water, and utilizing the vapor pressure within a sealed container to react the mixture at a low temperature of 75–85°C. It allows for the production of over 1g of high-purity, single-phase material in a single synthesis step without additional high-temperature heat treatment. Applicable to large-capacity aqueous zinc-ion ESS cathodes and non-flammable battery production lines, it reduces cathode material production costs by eliminating the need for pressure vessel equipment.
This invention was developed with support from the Ministry of Science and ICT for research on the structure-property correlation of zinc-ion conductors, combining powder diffraction-based crystal structure analysis and electrochemical impedance spectroscopy-based time constant analysis.
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