Etude et développement de couches minces de germanium pour une utilisation comme électrode négative dans des microaccumulateurs Li-ion

Abstract : Among the different energy sources, all solid state lithium microbatteries are the most promising candidates for the alimentation of miniaturised systems. In the aim of overcoming the current limitations of these micro power sources, germanium thin films prove to be a promising material as a negative electrode, due to their better chemical and thermal stability in comparison with metallic lithium. This PhD work was devoted to the development of germanium electrode coatings and the optimisation of their synthesis by magnetron sputtering. Their physical properties have been correlated to their electrochemical performances. The influence of the morphology and doping of the films on their electrochemical behaviour at different current densities and on the cyclability was established. Despite huge volumic variations of the electrode, this study showed the feasibility of integrating these films in Ge lithiated/ LiPON /Li microbatteries deposited by low temperature processes (Above IC compatibility). With this stack configuration, a stable specific capacity of 50 µAh/cm² (» 800 µAh/cm².µm) has been maintained during forty cycles. Different solutions have been suggested to improve the cyclability of all solid state microbatteries and the techniques used for directly depositing them on the electronic microcomponents.
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Benjamin Laforge. Etude et développement de couches minces de germanium pour une utilisation comme électrode négative dans des microaccumulateurs Li-ion. Autre. Institut National Polytechnique de Lorraine, 2006. Français. ⟨NNT : 2006INPL100N⟩. ⟨tel-01752791⟩

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