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<p>As a key component of lithium-oxygen (Li-O<sub>2</sub>) batteries, the cathode has an important influence on the electrochemical reaction process of the battery, and Li-O<sub>2</sub> batteries with nanopore cathodes tend to have higher discharge capacity. In order to investigate the effect of the cathode transfer path on the performance of Li-O<sub>2</sub> batteries under the nanopore condition, three nanopore integrated cathodes with different thicknesses (150&#xa0;μm, 300&#xa0;μm, and 450&#xa0;μm) are constructed in this work. Three aspects of cathode characteristics, battery performance, and electrochemical characteristics are investigated. It is found that the integrated cathode possesses an excellent pore structure with an average pore size of 19&#xa0;nm and an average pore volume of 1.049 cm<sup>3</sup>/g, and the specific surface area is much higher than that of the carbon paper cathode. Under this structural parameter, the batteries show excellent discharge performance, with the 450&#xa0;μm cathode having a discharge area capacity of up to 32.5 mAh/cm<sup>2</sup>, and the 150&#xa0;μm cathode having an ultrahigh volumetric capacity of 1541.8 mAh cm<sup>−3</sup>. The 300&#xa0;μm cathode exhibits better cycling stability. It can be seen that the increase in thickness can accommodate more discharge products, but it can reduce the utilization rate of the pores per unit volume. The right length of the transmission path improves the cycling stability of the battery. This paper provides data support for revealing the law of mass transfer path of nanopore cathode on the performance of Li-O<sub>2</sub> batteries.</p>

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Effect of Mass Transfer Path of Nanopore Integrated Cathode on the Performance of Li-O2 Batteries

  • 期刊论文

  • 发表日期：

    2025年12月19日

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  • Longfei Xu,
  • Hong Sun,
  • Tianyu Zhang,
  • Jie Li,
  • Qiang Li,
  • Zhichao Xue,
  • Mingfu Yu,
  • Baojia Sun

摘要

As a key component of lithium-oxygen (Li-O2) batteries, the cathode has an important influence on the electrochemical reaction process of the battery, and Li-O2 batteries with nanopore cathodes tend to have higher discharge capacity. In order to investigate the effect of the cathode transfer path on the performance of Li-O2 batteries under the nanopore condition, three nanopore integrated cathodes with different thicknesses (150 μm, 300 μm, and 450 μm) are constructed in this work. Three aspects of cathode characteristics, battery performance, and electrochemical characteristics are investigated. It is found that the integrated cathode possesses an excellent pore structure with an average pore size of 19 nm and an average pore volume of 1.049 cm3/g, and the specific surface area is much higher than that of the carbon paper cathode. Under this structural parameter, the batteries show excellent discharge performance, with the 450 μm cathode having a discharge area capacity of up to 32.5 mAh/cm2, and the 150 μm cathode having an ultrahigh volumetric capacity of 1541.8 mAh cm−3. The 300 μm cathode exhibits better cycling stability. It can be seen that the increase in thickness can accommodate more discharge products, but it can reduce the utilization rate of the pores per unit volume. The right length of the transmission path improves the cycling stability of the battery. This paper provides data support for revealing the law of mass transfer path of nanopore cathode on the performance of Li-O2 batteries.