Abstract

The active layer of a lithium-oxygen battery (LOB) cathode must have a complex structure consisting of two types of pores (macropores and mesopores). For successful operation of the cathode active layer during the LOB discharge, attempts are being made to create two types of pore clusters: a macropore cluster that provides the transport of oxygen to a zone, where the final product, lithium peroxide, is formed, and a mesopore cluster that guarantees the delivery of lithium ions. The structure of the cathode active layer composed of two types of clusters is optimized in model calculations. However, it from the experimental data, even after the actual implementation of these theoretical recommendations, that the LOB dimensional characteristics during the discharge (in particular, current density I, mA/cm², and cathodic capacitance C, C/cm²) remain low. In the present work, a new type of cathode active layer structure was suggested: a regular biporous model. In this model, the channels for the supply with oxygen and lithium ions are separated from each other. This fact allows one to simultaneously and independently improve the operation of each of the two channels. The calculations showed a clear advantage of the active layers with this new structure. In particular, the current density i and cathode capacitance С raised to tens of mA/cm² and about of a thousand of C/cm².

中文翻译：

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锂氧电池阴极活性层结构的规则双孔模型。阴极活性层总体特性的计算

摘要

锂氧电池（LOB）阴极的活性层必须具有由两种类型的孔（大孔和中孔）组成的复杂结构。为了在LOB放电期间成功地运行阴极活性层，正在尝试创建两种类型的孔簇：大孔簇，该簇将氧气输送到形成最终产物过氧化锂的区域，以及保证锂离子传递的中孔簇。在模型计算中优化了由两种簇组成的阴极活性层的结构。但是，从实验数据（即使在实际执行了这些理论建议之后）也可以得出放电过程中的LOB尺寸特性（特别是电流密度I，mA / cm^{如图2所示}，阴极电容C（C / cm ²）保持较低。在目前的工作中，提出了一种新型的阴极活性层结构：规则的双孔模型。在此模型中，氧气和锂离子的供应通道彼此分开。这一事实使人们可以同时独立地改善两个通道中每个通道的操作。计算结果表明，采用这种新结构的有源层具有明显的优势。特别地，电流密度i和阴极电容С上升到数十mA / cm ²且约为千C / cm ²。