Inorganic solid electrolytes are the most important component for realizing all-solid-state batteries with lithium metal anodes and enable safe battery cells with high energy densities. Their synthesis and processing are the subject of current research, especially the NASICON-type Li1+xAlxTi2-x(PO4)3 (LATP). Herein, the ability of sintering with electro-magnetic irradiation is investigated and correlated with different properties of prepared LATP pellets. First of all, an infrared camera records the temperature of the surface during the treatment. Second, the effect of the pulse fluence is investigated in terms of the topology and morphology of the pellets. Here, the arithmetic surface roughness Ra is the main parameter. Then, the depth of the radiation interaction in the pellet is measured. The focus of this paper is on the different pulse widths of the laser sources, and therefore, similar pulse and hatch overlap ensure equivalent areal energy input in both cases. As a summarized result, treatment with a shorter pulse width generates high peak pulse powers, resulting in higher temperatures, rougher surfaces and affecting deeper layers of the pellets compared to treatment with longer pulse width. On the contrary, excessive power leads to the ablation of the material up to destruction.
Lithium-sulfur batteries are a promising alternative to lithium-ion batteries due to their low weight and the high availability of sulfur. In addition to research on material aspects, scalable processes are needed to manufacture tailored sulfur cathodes with high-energy densities. Therefore, this work focuses on the usage of mechanical processes to prepare defined carbon-sulfur composite materials that are subsequently processed to electrodes. DEM simulations are used to calculate the necessary power input and the resulting stress energy for different mechanical processes.
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