Tetramethylammonium tetrafluoroborate is primarily used as an electrolyte in electrochemical applications, particularly in non-aqueous systems. Its high solubility in organic solvents and stability under various conditions make it suitable for use in electrochemical capacitors and batteries. Additionally, it serves as a phase-transfer catalyst in organic synthesis, facilitating the transfer of reactants between immiscible phases, which enhances reaction efficiency. The compound is also employed in the preparation of ionic liquids, which are used in green chemistry for their low volatility and recyclability. In analytical chemistry, it is utilized as a reagent in ion chromatography for the separation and detection of ions. Its role in these diverse applications highlights its versatility in both industrial and research settings.