Tetraethylammonium trifluoroacetate is primarily used as an electrolyte in electrochemical applications, particularly in non-aqueous systems. It is favored for its ability to enhance ionic conductivity in organic solvents, making it suitable for use in batteries, supercapacitors, and other energy storage devices. Additionally, it serves as a phase-transfer catalyst in organic synthesis, facilitating reactions between compounds in different phases. Its stability and solubility in various solvents also make it useful in analytical chemistry, particularly in ion-pair chromatography for separating and analyzing complex mixtures.