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Theses

Caractérisation électrochimique de microbatteries Li-Free

Abstract : To meet the needs of the miniaturization of mobile electronic systems, the world of energy storage has had to reinvent itself and propose innovative solutions to meet these problems. Among these solutions, all-solid "lithium-free" microbatteries offer many advantages (easy integration, safety aspect), despite their still limited cyclability. The objective of this thesis is to study these LiCoO2/LiPON/Cu microbatteries, in particular by electrochemical characterization, in order to understand their mechanisms and propose solutions to improve their performances. The study of the unit layers of this system made it possible to identify the main properties of each thin film and to know the chemical and structural composition of these layers. Then, the implementation of a charging protocol to significantly improve cycling performance was decoded using electrochemical impedance spectroscopy and XPS. This work allowed the detailed understanding of the physico-chemical mechanisms present at each stage and to describe a scenario as for the operation of this protocol. In addition, understanding these phenomena has been useful in proposing solutions to further increase the cycling resistance of Li-Free microbatteries, so that it can reach an initial capacity and cyclability equivalent to lithium metal microbatteries, used conventionally in microelectronics
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Submitted on : Wednesday, November 21, 2018 - 11:23:07 AM
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Franck Ferreira Gomes. Caractérisation électrochimique de microbatteries Li-Free. Matériaux. Université Paris-Saclay, 2018. Français. ⟨NNT : 2018SACLS369⟩. ⟨tel-01929476⟩

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