Li-ion battery electrode remanufacturing by nanosecond pulsed laser ablation



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Energy crisis since 1970’s stimulate people searching for alternative energy after crude oil, Li-ion battery becomes a candidate by then as alternative energy storage method due to its capability for high power and large-scale applications. However, end of life strategies for aged Li-ion battery are severe challenges for scientists and scholars. Li-ion battery degrades to its end of life reflecting as battery capacity loss. Major reason for battery performance degradation and capacity deterioration has been revealed by researchers as formation of solid electrolyte interface (SEI) on electrodes, which reflects as loss of cyclable lithium ions, increase of electrode resistance, isolation formation, electrode material degradation and impedance increase.

This study is aiming at developing an environmental methodology for aged Li-ion battery remanufacturing rather than the normal recycling processes. Laser ablation, a dry, rapid and non-contact process without potential chemical pollutant generation technology is utilized to remove SEI from electrode surface. Throughout this study, detailed process of experimental cell design and fabrication, cell degradation process, electrode characterization process and ablation result validation are presented. Characterization methods, including scanning electron microscope (SEM), Raman spectroscopy (RS), and Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) are used to study the morphology, structure and chemical changes of the SEI on electrode surface. Results show SEI is removed under certain laser parameter condition, and faded capacity has been restored through validation, which indicates laser ablation is a feasible way to clean electrode surface and an effective methodology for aged Li-ion battery remanufacturing to bring end of life Li-ion battery back to life.

Embargo status: Restricted until 09/2022. To request the author grant access, click on the PDF link to the left.



Lithium Ion Battery, Solid Electrolyte Interface, Laser Ablation, Remanufacturing