Dohyeon Mun, Jae-Young Bae
As the power and voltage of electric vehicles increase, the thermal stability of battery components, such as busbars, becomes critical. This study proposes a method for inorganic thermal insulation and insulating coating using alumina-silica hybrid particles deposited via electrophoretic deposition (EPD). We investigated the effects of copper substrate pre-treatment and the weight ratio of tetraethylorthosilicate (TEOS) to methyltrimethoxysilane (MTMS) on the quality of the coating. AFM analysis confirmed that a 1-min pre-treatment optimized surface roughness, which helped prevent cracks during the drying process. Among the various compositions tested, the sample with 30% TEOS demonstrated the highest thermal stability (670 °C) and dispersion stability (zeta potential of -15.5 mV), attributed to the increased density of the siloxane network. All samples maintained insulation performance up to 6.3 kV. These findings present an effective strategy for enhancing the fire safety of EV electrode materials.