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2021
Conference Paper
Titel
Laser sintering of ceramic-based solid-state battery materials
Abstract
Solid-state batteries (SSB) can increase gravimetric energy density and safety compared to conventional lithium ion batteries. Possible materials for SSB are ceramic oxides, for example LiCoO2 (LCO) as cathode material and Li7La3Zr2O12 (LLZ) as electrolyte material. Due to the low ionic conductivity of the cathode material it is necessary to mix the cathode material with the electrolyte to generate a mixed cathode with higher ionic conductivity. Microparticle layers of cathode and electrolyte materials must be sintered to reach a functional and dense layer. A laser sintering process enables short interaction times at elevated temperatures. Therefore, diffusion processes and side phases could be reduced. In this work, mixed cathode layers consisting of LCO and LLZ were screen printed on steel substrates generating a direct contact to the current collector and afterwards laser sintered. Crystallographic investigations by x-ray diffraction revealed the existence of the desired phases (LLZ and LCO), while the densification was successfully observed by scanning electron microscopy. The adhesion of the layer to the substrate was proven by tape tests. A pyrometry based control of the laser power is implemented and different process temperatures are compared. Additionally, a thermal pre-heating on a hotplate was applied leading to an improved layer-substrate adhesion.
Author(s)