Applying operando investigations is becoming essential for acquiring fundamental insights into the reaction mechanisms and phenomena at stake in batteries currently under development. The capability of a real-time characterization of the charge/discharge electrochemical pathways and the reactivity of the electrolyte is critical to decipher the underlying chemistries and improve the battery performance. Yet, adapting operando techniques for new chemistries such as metal-oxygen (i.e. metal-air) batteries introduces challenges in the cell design due notably to the requirements of an oxygen gas supply at the cathode. Herein a simple operando cell is presented with a two-compartment cylindrical cell design for NMR spectroscopy. The design is discussed and evaluated. Operando ⁷Li static NMR characterization on a Li–O₂ battery was performed as a proof-of-concept. The productions of Li₂O₂, mossy Li/Li dendrites and other irreversible parasitic lithium compounds were captured in the charge/discharge processes, demonstrating the capability of tracking the evolution of the anodic and cathodic chemistry in metal-oxygen batteries.

对当前正在开发的电池中的反应机理和现象所掌握的基本见解，进行操作研究变得至关重要。实时表征充电/放电电化学路径和电解质反应性的能力对于破译底层化学物质和改善电池性能至关重要。然而，将操作技术适应于诸如金属-氧气（即，金属-空气）电池之类的新化学方法，在电池设计中带来了挑战，这主要是由于在阴极处需要氧气供应的缘故。在此简单的操作核磁共振波谱仪采用两室圆柱池设计。对设计进行了讨论和评估。在概念上证明了在Li–O ₂电池上进行Operando ⁷ Li静态NMR表征。在充电/放电过程中捕获了Li ₂ O ₂，长满苔藓状的Li / Li树枝状晶体和其他不可逆的寄生锂化合物的产生，这表明了跟踪金属-氧气电池中阳极和阴极化学变化的能力。