With global warming largely resulting from greenhouse gas emissions, a transition to more sustainable energy storage solutions has become essential. That is why, this thesis will focus on the limitation of current lithium-ion batteries, including dendrite formation and safety issues, and explore solid-state (SSB) and solid-state thin-film (SSTB) batteries, which have the main advantages of improving energy density, safety and reducing charge times.

The focus is on manufacturing SSTBs using atmospheric plasma spraying (APS) and suspension plasma spraying (SPS), promising techniques for reducing costs and optimizing production processes.

This project aims to develop solid-state thin film Li-ion battery components using two ther-mal spraying methods (APS and SPS) with desired characteristics. In addition, this thesis studies the impact of these two types of spraying on the microstructure and electrochemistry of these materials composing the battery.

During this thesis, several investigations were carried out on the material making up the battery. These include two different anode materials, LTO and LTO3C, a solid electrolyte, LLZO, and a cathode material, NMC. The investigations include surface characterisation, cross-sectional characterisation, elemental analysis, X-ray diffraction and electrochemical analysis.The results obtained are encouraging. For the APS process, the microstructure was generally satisfactory despite some residual defects.

The results of the electrochemical analysis are en-couraging. For the SPS process, the microstructure was satisfactory and had fewer defects compared to APS coating except for LLZO, but more in-depth experiments are needed to fully assess the electrochemical aspects.

The conclusion of this thesis is that the APS and SPS processes offer promising prospects for the manufacture of SSTB. However, it is still necessary for further research and analysis of the experimental data in order to obtain reliable and definitive results.