Nanoencapsulation of Silicon Carbide-Doped Hydrated Salt for Safe and High-Efficient Battery Thermal Management

Herein, silicon carbide (SiC)-doped hydrated salt phase change nanocapsules (NePCMs) with enhanced thermal conductivity and nonflammability were synthesized using a simple method for battery thermal management systems (BTMs). The additional amount of SiC played a critical role in the heat capacities of hydrated salt nanocapsules. The resultant phase change nanocapsules have a latent heat of over 145.6 kJ/kg, good encapsulation of around 60%, thermal conductivity of 0.51 W m–1 K–1, as well as good leak-proof property and thermal cycle stability. More importantly, due to the perfect core–shell structure, the hydrated salt nanocapsules exhibited a significant enhancement in corrosion protection and flame-retardant property. High-rate charging test at ambient temperature showed that the NePCMs cooling was able to maintain a low maximum temperature during the melting process and keep the battery temperature within a safe range. In conclusion, the phase change nanocapsules developed in this work may have great promise in the field of safe and high-efficient battery thermal management.