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<p>Lithium–ion batteries occupy a core position in renewable energy systems. The performance of the battery is critically determined by the drying quality of the wet coating electrode’s surface. Currently, hot air drying is widely adopted in industrial applications, but it suffers from poor efficiency, excessive energy consumption and inconsistent drying performance. For resolving these existing issues, this paper proposes a radiation–hot air combined drying method. A 3D dynamic multiphysics coupling model is established for the drying process of wet coatings. The energy consumption and coating quality of electrode sheet wet coatings are systematically investigated under three drying methods: hot air, radiation, and radiation–hot air combined drying. The research results indicate that when drying wet coatings to the same moisture content, the energy consumption of combined drying is only 35.1% of that of hot air drying. Under the aforementioned energy consumption conditions, the total drying duration of the combined drying approach (35&#xa0;s) is respectively reduced by 30% and 12.5% relative to conventional hot air drying (50&#xa0;s) and independent radiation drying (40&#xa0;s). The coating obtained simultaneously has better drying uniformity, with a final moisture non-uniformity of 0.85% and an average non-uniformity of 1.44%, both better than the two single drying methods. The above results indicate that radiation–hot air combined drying method boasts favorable performance in lowering energy use and improving electrode sheet drying quality, providing theoretical rationale for the optimization of industrial drying processes.</p>

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Comparison of drying characteristics for wet coating of battery electrodes under different drying method

  • 期刊论文

  • 发表日期：

    2026年7月10日

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  • Wanghong Han,
  • Yue Zeng,
  • Hongqiang Ma,
  • Jiajun Wang,
  • Junkai Wu,
  • Xiaosong Cheng,
  • Jing Wu,
  • Huilun Kang,
  • Sikai Zou

摘要

Lithium–ion batteries occupy a core position in renewable energy systems. The performance of the battery is critically determined by the drying quality of the wet coating electrode’s surface. Currently, hot air drying is widely adopted in industrial applications, but it suffers from poor efficiency, excessive energy consumption and inconsistent drying performance. For resolving these existing issues, this paper proposes a radiation–hot air combined drying method. A 3D dynamic multiphysics coupling model is established for the drying process of wet coatings. The energy consumption and coating quality of electrode sheet wet coatings are systematically investigated under three drying methods: hot air, radiation, and radiation–hot air combined drying. The research results indicate that when drying wet coatings to the same moisture content, the energy consumption of combined drying is only 35.1% of that of hot air drying. Under the aforementioned energy consumption conditions, the total drying duration of the combined drying approach (35 s) is respectively reduced by 30% and 12.5% relative to conventional hot air drying (50 s) and independent radiation drying (40 s). The coating obtained simultaneously has better drying uniformity, with a final moisture non-uniformity of 0.85% and an average non-uniformity of 1.44%, both better than the two single drying methods. The above results indicate that radiation–hot air combined drying method boasts favorable performance in lowering energy use and improving electrode sheet drying quality, providing theoretical rationale for the optimization of industrial drying processes.