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Performances of eutectic phase change composites containing CNTs/GO/PVA oriented aerogels coated with EP/CNTs/CFR for Li-ion batteries thermal management in wide temperature range

Author

Listed:
  • Shen, Junjie
  • Dong, Weijie
  • Xu, Xiaobin
  • Gong, Zhiwen
  • Ye, Bing
  • Wang, Xiaolin
  • Zhou, Fei

Abstract

A novel phase change composite (PCC) was developed to overcome the low thermal conductivity, poor stability, and limited energy conversion efficiency restricting phase change materials (PCMs) for battery thermal management. This PCC integrates a highly oriented, ultralight carbon nanotube/graphene oxide/polyvinyl alcohol (CGP) aerogel, fabricated via mixed cross-linking and directional freeze-drying, infused with a lauric acid-stearic acid eutectic PCM. The composite is further encapsulated with an epoxy resin/carbon nanotubes/composite fire retardant (EP/CNTs/CFR) coating. The CGP aerogel's porous, aligned structure boosted thermal conductivity by 300% even at a high PCM loading (95.1 ± 0.6 wt%). The EP/CNTs/CFR coating provided excellent shape stability (0.5 ± 0.18 % leakage), long-term durability (over 200 thermal cycles), and enhanced flame retardancy (11 ± 2 s residual flame time). The integrated CNTs/GO network and surface CNTs also improved electrical conductivity and solar absorption, achieving high photothermal (87.6 ± 1.9%) and electrothermal (76.7 ± 1.13%) conversion efficiencies. Applied to lithium-ion battery thermal management, the PCC effectively enabled dual-mode preheating and cooling functions. It increased discharge energy by 1.13 ± 0.06 Wh at −20 °C (3C-rate) and reduced operating temperatures by 23.9 ± 0.4 °C under high-rate/dynamic loads. This PCC thus serves as an efficient dual-mode thermal regulator for batteries across extreme temperatures.

Suggested Citation

  • Shen, Junjie & Dong, Weijie & Xu, Xiaobin & Gong, Zhiwen & Ye, Bing & Wang, Xiaolin & Zhou, Fei, 2025. "Performances of eutectic phase change composites containing CNTs/GO/PVA oriented aerogels coated with EP/CNTs/CFR for Li-ion batteries thermal management in wide temperature range," Energy, Elsevier, vol. 339(C).
    • Handle: RePEc:eee:energy:v:339:y:2025:i:c:s0360544225047371
    DOI: 10.1016/j.energy.2025.139095
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    References listed on IDEAS

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