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<p>The increasing risk of thermal runaway in EV batteries highlights the need for advanced thermal management materials with high heat resistance and flame retardancy. This study explores the potential of expandable graphite (EG) as a thermal barrier by incorporating it into a polyimide (PI) matrix and laminating the composite between polyethylene (PE) films. Laser processing was employed to improve structural stability and thermal performance. The optimized film, with an EG:PI ratio of 1:2, laser power of 0.5 W, and scanning speed of 37.14 mm/s, showed an 8.64 % reduction in surface temperature compared to untreated films. The results reveal how laser-induced microstructural changes and PI content influence the thermophysical behavior of EG-based composites. This study offers an experimental framework for optimizing EG composites in high-temperature environments and demonstrates their potential in next-generation battery thermal management and protection systems.</p>

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A study on thermal barrier properties of laser-treated expandable graphite films

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • Su A. Kim,
  • Chan Su Moon,
  • Bo Sung Shin

摘要

The increasing risk of thermal runaway in EV batteries highlights the need for advanced thermal management materials with high heat resistance and flame retardancy. This study explores the potential of expandable graphite (EG) as a thermal barrier by incorporating it into a polyimide (PI) matrix and laminating the composite between polyethylene (PE) films. Laser processing was employed to improve structural stability and thermal performance. The optimized film, with an EG:PI ratio of 1:2, laser power of 0.5 W, and scanning speed of 37.14 mm/s, showed an 8.64 % reduction in surface temperature compared to untreated films. The results reveal how laser-induced microstructural changes and PI content influence the thermophysical behavior of EG-based composites. This study offers an experimental framework for optimizing EG composites in high-temperature environments and demonstrates their potential in next-generation battery thermal management and protection systems.