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Towards a Li-ion photo-rechargeable battery

Abstract : Sunlight, as abundant clean source of energy, can alleviate the energy limits of batteries, while batteries can address photovoltaic intermittency. Conventional design of solar charging batteries involves the use of batteries and solar modules as two separate units connected by electric wires. In this work, we have studied another approach to harvest and store solar energy simultaneously into a single device, using a TiO2 bi-functional Li-ion battery photo-electrode. The apprehension of an electrode undergoing simultaneous light absorption and Li+ intercalation/extraction is very rich in terms of potentialities. At the same time, the various facets of the electrode evolution are very challenging to track and understand. Mesoporous TiO2 anatase thin film on FTO substrates are used as model electrodes to allow a careful control of the electrode architecture. They are prepared by combining the sol-gel chemistry with the dip-coating process, using the “evaporation induced self-assembly” (EISA) approach. In order to bring the proof of concept of the photo-recharge of the electrode, its electrochemical behaviour under illumination is studied using a Li-ion battery configuration. Photo-induced mechanisms and fate of photo-charges are investigated by studying the influence of the electrode architecture and of the electrolyte.
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  • HAL Id : tel-02994615, version 1

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Olivier Nguyen. Towards a Li-ion photo-rechargeable battery. Material chemistry. Sorbonne Université, 2018. English. ⟨NNT : 2018SORUS437⟩. ⟨tel-02994615⟩

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