Synthesis of Flexible Phase Change Materials with In Situ Formed Porous TiO ₂ for Highly Efficient Battery Thermal Management

To address the dual challenges of fragile structures prone to damage and packaging systems susceptible to leakage in thermal management of electronic devices for traditional phase change materials, this study proposes an organic‐porous synergistic packaging strategy. A porous TiO 2 skeleton is in situ constructed via a one‐pot one‐step method to synchronously encapsulate paraffin wax and thermoplastic elastomer styrene ethylene butylene styrene (SEBS). The innovation lies in utilizing solvent evaporation‐induced phase separation and sol–gel reaction to enable the porous TiO 2 (specific surface area 316.307 m 2 g –1 ) and SEBS to form a rigid‐flexible synergistic structure, achieving low leakage rate and stability in 2000 thermal cycles. In battery thermal management, the battery temperature is controlled within a safe range at 1–3C rates, extending the safe operation duration of the battery by more than 10 times. It provides a referable option for efficient thermal management of wearable electronic devices and flexible devices.