Multi-scale Operando Investigation over Lithium-air Batteries: From Cell Design to Analysis Integration.

Friday, March 12, 2021: 9:40 AM - 10:15 AM

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Description

Lithium-Air batteries have been the spotlight on many circumstances over the last 5 years, sporadically showing as a potential break-through for energy storage devices. Despite their very-high energy density with up to a one-fold increase compared to Li-ion, industry and part of the scientific community remains sceptical over its practical implementation. Li-Air mainly suffers from poor cyclability and round-trip efficiency as it needs precise control over the formed and decomposed chemicals, known as discharge products, within a 3-dimensional porous electrode. The design of effective electrodes is only as good as our capacity to understand their role on the chemistry dynamic inside of the device. Here we report the development and integration of multi-scale tools for in-situ and operando chemical and morphological assessment for Li-Air devices, seeking to resolve from local (nano-sized) chemical composition to macro-scale analysis in real-time. To accomplish that we have designed different tailored cells for multiple analysis such as: Raman Spectroscopy, Synchrotron X-ray diffraction, Fourier Transform Infrared spectro-microscopy (micro-FTIR) and Synchrotron infrared nanospectroscopy (SINS). The cells were created to be used as multi-technique combining more traditional electrochemical analysis, such as galvanostatic charge/discharge and linear or pulse voltammetry. Those analysis combined with ex-situ SEM and XPS/UPS has gave us an unique view pertaining the device dynamics and aided to uncover uncommon reaction mechanisms linked to battery failure since the first seconds of operation and on unravelling reaction selectivity depending on cell operating conditions. Therefore, by integrating multiple analysis around the device we can diagnose the role of materials used for building electrodes, thus aiding on its design.

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Track(s)

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  Energy

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Additional Info

Keywords: Please select up to 4 keywords ONLY:
Materials Characterization,Renewable Energy,Infrared Spectroscopy,X-Ray Diffraction