Gauthier Magali, Nguyen Minh Hoang, Blondeau Lucie, Foy Eddy, Wong Alan
Université Paris-Saclay, CEA, CNRS, NIMBE, 91191, Gif-sur-Yvette, France.
Université Paris-Saclay, CEA, CNRS, NIMBE, 91191, Gif-sur-Yvette, France.
Solid State Nucl Magn Reson. 2021 Jun;113:101731. doi: 10.1016/j.ssnmr.2021.101731. Epub 2021 Mar 29.
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. OperandoLi static NMR characterization on a Li-O battery was performed as a proof-of-concept. The productions of LiO, 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.
应用原位研究对于深入了解当前正在开发的电池中的反应机制和相关现象至关重要。实时表征充放电电化学途径以及电解质反应活性的能力对于解读潜在化学过程和提高电池性能至关重要。然而，将原位技术应用于诸如金属-氧（即金属-空气）电池等新化学体系时，由于阴极需要供应氧气，在电池设计方面带来了挑战。本文提出了一种用于核磁共振光谱的具有两室圆柱形电池设计的简单原位电池。对该设计进行了讨论和评估。作为概念验证，对锂-氧电池进行了原位锂静态核磁共振表征。在充放电过程中捕获了LiO、苔藓状锂/锂枝晶和其他不可逆寄生锂化合物的生成情况，证明了跟踪金属-氧电池中阳极和阴极化学演变的能力。
