Dual enhancement of battery thermal management performance by waste cigarette butts and metal organic frameworks-derived carbon

Battery thermal management integrated with phase change materials (PCMs) are widely utilized to regulate the battery temperature and guarantee the battery safety. However, the thermal management efficiency is restricted by the low thermal conductivity of PCMs and limited heat conduction of the relevant configuration. Incorporating carbon derived from waste and metal organic frameworks (MOF) into PCMs is effective to enhance thermal conductivity and to mitigate leakage. In this work, the waste cigarette butts and ZIF-67 are carbonized and used as additives to enhance the thermal performance of the palmitic acid-stearic acid-paraffin (PA-SA-PW) mixture. The improvement of cigarette butt-derived activated carbon (CBAC) and FeCoNC on thermal conductivity, thermal energy storage performance and the effect on battery thermal management are studied. The results reveal that compared with PA-SA-PW mixture, the increase of thermal conductivity of the PA-SA-PW/(FeCoNC-CBAC) 0.05 composite is up to 34.1%. During the heating process, the total time for the temperature at the geometric center of the PA-SA-PW/(FeCoNC-CBAC) 0.05 composite to reach 80 ℃ can be 54.2% shorter than that of the PA-SA-PW mixture. The maximum average battery temperature is 35.61 ℃ for discharge rate of 5 C, representing reduction of approximately 82% by utilizing a gradient porous aluminum skeleton with the layer thickness of PA-SA-PW/(FeCoNC-CBAC) 0.05 of 2 mm compared to natural convective cooling. Thus, the composite presents promising potential for battery thermal management application.