The service life of the lithium–oxygen (Li–O₂) battery is an essential factor in measuring the performance of the battery, and it is also imperative to clarify the reason for battery termination. In this work, the positive electrode of a nonaqueous Li–O₂ battery was selected after cutoff under different discharge conditions, and the digital reconstruction model of the positive electrode was carried out by X-CT technology. The reconstructed positive electrode’s structural characteristics, material transport characteristics, and electrical conductivity were analyzed. It is found that the positive electrode has an apparent expansion phenomenon after constant capacity cyclic charge and discharge, but this situation is not evident after deep discharge. After the constant capacity test is cut off, the product distribution range in the positive electrode is more comprehensive and the material transport efficiency is higher. However, after deep discharge, the product distribution in the positive electrode is more concentrated and the material transport efficiency is lower. There are apparent differences in the termination mechanism between constant capacity cycle discharge and deep discharge. This paper provides a compelling theoretical basis for revealing the discharge termination mechanism of nonaqueous Li–O₂ batteries.

中文翻译：

---

基于数字重构模型的非水锂O2电池放电终止机制分析


锂氧(Li–O ₂ )电池的使用寿命是衡量电池性能的重要因素，明确电池终止原因也势在必行。本工作选择不同放电条件下截止后的非水Li-O ₂电池正极，并利用X-CT技术对正极进行数字化重建模型。分析了重构正极的结构特性、材料传输特性和电导率。发现恒容量循环充放电后正极有明显的膨胀现象，但深度放电后这种情况不明显。断掉恒容量测试后，正极内的产物分布范围更全面，物质传输效率更高。但深度放电后，正极内的产物分布更加集中，物质传输效率较低。恒容量循环放电和深度放电的终止机制存在明显差异。该论文为揭示非水Li-O ₂电池的放电终止机制提供了令人信服的理论基础。