Fluorescent species are formed during cycling of lithium ion batteries as a result of electrolyte decomposition due to the instability of the non-aqueous electrolytes and side reactions that occur at the electrode surface. The increase in the background fluorescence due to the presence of these components makes it harder to analyze data due to the spectroscopic overlap of Raman scattering and fluorescence. Within the presentation I will demonstrate how Kerr gated Raman spectroscopy can be used as an effective technique for the isolation of the scattering effect from the fluorescence enabling the collection of the Raman spectra of LiPF<sub>6</sub> salt and LiPF<sub>6</sub>-based organic carbonate electrolyte, without the interference of the fluorescence component. A comparison will be made with FT-Raman using a Laser excitation at 1064 nm, where we show that it is possible to obtain Raman spectra of Li-ion battery relevant materials above a diminished fluorescence background, but with a much lower sensitivity compared to using Kerr Gated Raman with an excitation at 400 nm [1]. Recent data of operando Kerr gated Raman during lithium insertion will also be highlighted.

Heparan sulfate Raman spectroscopy to investigate processes at lithium-ion electrode interfaces

ACS Fall 2021

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