Journal Article

FZJ-2025-01776

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Laser-Micro-Annealing of Microcrystalline Ni-Rich NCM Oxide: Towards Micro-Cathodes Integrated on Polyethylene Terephthalate Flexible Substrates

Ahrens, L.FZJ* ; Mikulics, M. (Corresponding author)FZJ* ; Schröder, S. ; Mayer, J.FZJ* ; Hardtdegen, H. H. (Corresponding author)FZJ*

2025
MDPI Basel

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Please use a persistent id in citations: doi:10.3390/ma18030680  doi:10.34734/FZJ-2025-01776

Abstract: Here in this work, we report on micro-Raman spectroscopy investigations performed on freestanding Ni-rich NCM (LixNi0.83Co0.11Mn0.06O2) microcrystals transferred to flexible polyethylene terephthalate (PET) host substrates. This technological procedure introduces a first building block for future on-chip-integrated micro-accumulators for applications in flexible optoelectronics, sensors, microbiology, and human medicine. An after-synthesis thermal treatment was used to help improve the material homogeneity and perfection of the cathode material. To this end, a local laser micro-annealing process was applied to the freestanding Ni-rich NCM microcrystals. The thermally initialized structural processes in the singular micro-cathode units were characterized and determined by micro-Raman spectroscopy. Micro-Raman mapping images revealed the evolution of a recrystallization process after the local annealing procedure. Furthermore, laser micro-annealing led to the suppression of the pristine “polycrystalline morphology” of the investigated micro-cathode regions. Besides the dominant characteristic Raman mode at ~1085 cm−1, most likely ascribed to lithium carbonate, metal oxides with Raman modes around ~550 cm−1 were identified. This highly efficient transfer and integration technology represents a basic building block towards micrometer-sized accumulators for a large range of emerging applications.

Note: This research was funded by the Joint Lab for Integrated Model and Data-Driven Material Characterization (MDMC) of the Helmholtz Association.

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Contributing Institute(s):

1. Materialwissenschaft u. Werkstofftechnik (ER-C-2)

Research Program(s):

1. 5353 - Understanding the Structural and Functional Behavior of Solid State Systems (POF4-535) (POF4-535)

Appears in the scientific report 2025

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