A review of conductive lubricating grease for use in high-speed bearings, electric motors and aerospace components

Purpose This study aims to evaluate the limitations of conventional lubricating greases and recent advances in electrically and thermally conductive grease formulations tailored for electric vehicle (EV) applications. Design/methodology/approach A comprehensive survey of recent literature, patent filings and commercial products assessed grease performance under EV-relevant conditions such as high speed, elevated temperatures and electrical discharge. Findings Conventional greases exhibit poor thermal stability and electrical insulation, leading to bearing failures in EV motors. Innovations in base oils, thickeners and conductive fillers significantly improve thermal endurance and charge dissipation. Originality/value This work highlights the need for multifunctional greases and provides a framework for synergistic design strategies that address tribological, thermal and electrical demands in EV drivetrains, supporting enhanced reliability and efficiency.