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Thermal absorption enhancement of a flexible hydrated salts phase change film for efficient thermal dissipation of electronic devices

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  • Wang, Qirui
  • Wang, Xiang
  • Gu, Xiaobin
  • Zhou, Yongquan
  • Nian, Hongen

Abstract

The transient high-heat flux generated by modern electronics threatens both performance and safety, especially during high-temperature runaway events. Here we report a hydrated-salt phase-change film (HSPCF) obtained by vacuum-impregnating sodium-acetate-trihydrate (SAT) into a three-dimensional expanded-graphite (EG) scaffold and consolidating the composite with a flexible poly (vinylidene fluoride) (PVDF) matrix. The film couples an exceptional latent-heat capacity of 176 J g−1 with a through-plane thermal conductivity of 1.64 W m−1 K−1. EG furnishes a continuous heat-conduction network, while SAT provides high-enthalpy, isothermal heat absorption; together they lower interfacial thermal resistance by exploiting the film's temperature-responsive flexibility. The material is self-extinguishing (UL-94 V-0) and electrically insulating (breakdown strength = 9.81 kV mm-1). Device-level tests show that the HSPCF suppresses hotspot temperature by 10 °C in 6 C-discharged Li-ion-battery modules and by 17 °C (20 °C vs. commercial pads) on a high-power CPU, enabling sustained 100 % load. These results demonstrate a cost-effective, scalable solution for next-generation thermal management.

Suggested Citation

  • Wang, Qirui & Wang, Xiang & Gu, Xiaobin & Zhou, Yongquan & Nian, Hongen, 2025. "Thermal absorption enhancement of a flexible hydrated salts phase change film for efficient thermal dissipation of electronic devices," Energy, Elsevier, vol. 335(C).
    • Handle: RePEc:eee:energy:v:335:y:2025:i:c:s0360544225033468
    DOI: 10.1016/j.energy.2025.137704
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