CC BY
3The 30th International Conference on Advanced Laser Technologies
ALT'23
LM-O-7
Laser-induced processes in lithium battery materials, studied by micro-Raman spectroscopy
D. Pelegov, A. Ryabin, A. Nikiforov
Ural Federal University, 19 Mira street, Ekaterinburg, 620002, Russian Federation
Main author email address: dmitry.pelegov@urfu. com
Today, lithium battery market is a crucial element for three major industries: automotive, portable electronics and energy generation/distribution. The fast-growing popularity of electric vehicles, renewables, and smart grids resulted in the boom of lithium battery gigafactories all around the world, raising the question of proper quality control tools ensuring the desired quality of the produced products at newly established production lines. Raman Spectroscopy is an industry-friendly, prompt, and inexpensive method to control the quality of various lithium battery materials. But since Raman spectroscopy uses laser irradiation and in the most cases the laser beam is focused on the spot with a sub-micron diameter, the study of laser-induced processes became of the great value.
In this work the laser-induced degradation for main electrode materials is reviewed in brief and discussed in details for LiFePO4 (LFP) [1] and Mn-doped Li4Ti5Oi2 (Mn-LTO) [2]. For popular cathode material LFP we have revealed the variation of the decomposition pathways and products. For anode material Mn-LTO we report about fast and slow induced degradation processes, and laser ablation of degradation processes (Fig. 1). The obtained results let us to conclude about non-thermal amorphization and melting processes due to electronic system excitation by intraband transitions with the following covalent bond destabilization. The key role of imperfections in laser-induced decomposition is discussed.
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Fig. 1. SEM images of Mn-LTO particle before (first row) and after (second row) the repeated action of focused laser irradiation during Raman
spectra measurements. The image is taken from [2].
The research was funded by the Russian Science Foundation (project no. 22-22-00350, https://rscf.ru/proj ect/22- 22-00350).
[1] A. Ryabin and D. Pelegov, An ambiguity of laser-induced degradation in LiFePO4 and advantages of single-particle approach to Raman spectroscopy. J Raman Spectrosc, 53, 1625-1634 (2022).
[2] A. Nikiforov, D. Kuznetsov, R. Nasara, K. Govindarajan, S. Lin, D. Pelegov, Fast and Slow Laser-Stimulated Degradation of Mn-Doped Li4Ti5O12, Batteries, 8, 251 (2022).
