Die Synthese des Verbundwerkstoffes Lithiumeisenphosphat-Kohlenstoff durch Ultraschallsprühpyrolyse

Autor*innen

• Albrecht Schwinger

Parameter

• Lehrbücher
• Universitätslehrbücher

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This thesis investigates the synthesis of Lithium-iron-phosphate-carbon (LiFePO4/C) as a core shell material using ultrasonic spray pyrolysis (USP). LiFePO4/C is a promising cathode material for Li-ion batteries due to its thermochemical stability, high energy density, cell voltage, and cycle stability. However, its conductivity, at 10-9 S cm-1, is a limiting factor, which can be improved to 10-3 S cm-1 with carbon. The goal is to synthesize core shell particles with LiFePO4 in the core and C in the shell in a single USP process. Ultrasound converts the precursor into a spray, which then transforms into LiFePO4/C in a wall-heated reactor tube. Product purity is confirmed through X-ray diffraction (XRD), while Differential Thermal Analysis and thermogravimetry (DTA/TG) reveal the pyrolysis process. Investigations into thermal transfer and residence time are conducted, alongside droplet and particle size analysis via laser diffraction. Morphological studies are performed using TEM and EDX, providing insights into the synthesis parameters. A successful synthesis of defined core shell particles is achieved through optimized parameters, and a CS-factor is developed to evaluate core shell quality. Additionally, Li(NiMnCo)0.33O2 is synthesized to demonstrate the versatility of USP for different cathode materials.

• Sprache: Deutsch
• Erscheinungsdatum: 2016