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<p>To enhance the overall performance of lithium-ion battery separators, this study utilized boehmite ceramic particles (AlOOH) as the coating material and employed a wire-rod coating method to uniformly apply a functional coating to both sides of a commercial PP separator. The structure and performance of the modified separators were characterized using scanning electron microscopy (SEM), contact angle testing, wetting performance testing, and thermal stability testing, followed by electrochemical tests in assembled CR2032 coin cells. The results showed that the introduction of the boehmite coating effectively suppressed thermal shrinkage of the separator at high temperatures, with the coated separator maintaining good dimensional stability after being treated at 160&#xa0;°C for 30&#xa0;min. Additionally, the hydrophilicity and porous structure of AlOOH significantly improved the separator’s electrolyte wettability and liquid absorption rate. Performance testing of the assembled CR2032 coin cells demonstrated that the coated separators exhibited superior rate performance and cycling stability compared to the original separators, particularly the separator with 10wt% AlOOH, which achieved an initial discharge specific capacity of 148.2 mAh·g⁻¹ and a capacity retention rate of 97.4% after 100 cycles, exhibiting the best electrochemical performance.</p>

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Enhancement of thermal stability and electrochemical performance of polypropylene separator by boehmite coating modification

  • 期刊论文

  • 发表日期：

    2026年5月25日

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  • Xinyong Liu,
  • Yong Lu,
  • Junhe Yu,
  • Chen Wang,
  • Jiacun Lu

摘要

To enhance the overall performance of lithium-ion battery separators, this study utilized boehmite ceramic particles (AlOOH) as the coating material and employed a wire-rod coating method to uniformly apply a functional coating to both sides of a commercial PP separator. The structure and performance of the modified separators were characterized using scanning electron microscopy (SEM), contact angle testing, wetting performance testing, and thermal stability testing, followed by electrochemical tests in assembled CR2032 coin cells. The results showed that the introduction of the boehmite coating effectively suppressed thermal shrinkage of the separator at high temperatures, with the coated separator maintaining good dimensional stability after being treated at 160 °C for 30 min. Additionally, the hydrophilicity and porous structure of AlOOH significantly improved the separator’s electrolyte wettability and liquid absorption rate. Performance testing of the assembled CR2032 coin cells demonstrated that the coated separators exhibited superior rate performance and cycling stability compared to the original separators, particularly the separator with 10wt% AlOOH, which achieved an initial discharge specific capacity of 148.2 mAh·g⁻¹ and a capacity retention rate of 97.4% after 100 cycles, exhibiting the best electrochemical performance.