Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.147
Publication date: 22nd December 2022
Recent advances in wearable and IoT technologies has led to a strong demand for embedded Li-ion microbatteries. There is also a need for microbatteries with superior mechanical characteristics such as flexibility, stretchability while maintaining strong electrochemical performances.
In this work, we present micro/nano-structuration of microbatteries electrodes surface [1]. Patterning of electrodes materials allows improvement of both mechanical resistance and electrochemical performance of these microbatteries [2]. 3D surface enhancement owing to the design of micropillar electrodes permits to fulfil this need. Lithium nickel manganese oxide (positive electrode) and Lithium titanate oxide (negative electrode) micropillars with different sizes are fabricated on aluminium foils by laser ablation technique and are then separated by a polymer electrolyte to form flexible lithium-ion microbatteries [3].
We have demonstrated that the micropillar size has an influence on the electrochemical performance of Li-ion microbatteries. Optimized pillar dimensions drastically enhance areal capacity. For micropillar size of 25 µm*25 µm the areal capacity is 822 μAh.cm–2 at 1C (1×2 cm electrodes) [4].
In addition, a treatment of electrolyte-coated electrodes under vacuum improves electrochemical properties due to a better filling of the interpillar space by the electrolyte polymer. Under optimized conditions, the capacity delivered by the microbattery is four times higher than the planar system counterpart. Higher areal discharge capacity is obtained when the electrodes follow a treatment in vacuum: 1049 μAh.cm–2 at 1C for micropillar size of 25 µm*25 µm. This vacuum treatment can be easily done at room temperature. Figure 1 shows the increase of areal capacity at 1C versus the time vacuum treatment.
Thanks to low thickness below 1 mm and high flexibility, these optimized microbatteries can be used in applications such as powering smart contact lens [5].
Part of this work was done with the support of ID-Fab (Project funded by the European Regional Development Fund, the French state and local authorities).
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