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ALD Alumina Passivated Silicon Nanotrees electrodes for Ultrastable Microsupercapacitors

P. Gentile 1 Anthony Valero 2, 1 Dorian Gaboriau 3, 1 Maxime Boniface 4 Dmitry Aldakov 2 Saïd Sadki 5, 2
1 SiNaps - Silicon Nanoelectronics Photonics and Structures
PHELIQS - PHotonique, ELectronique et Ingénierie QuantiqueS : DRF/IRIG/PHELIQS
2 STEP - Synthèse, Structure et Propriétés de Matériaux Fonctionnels
SYMMES - SYstèmes Moléculaires et nanoMatériaux pour l’Energie et la Santé : DRF/IRIG/SYMMES
3 LEMOH - Laboratoire d'Electronique Moléculaire Organique et Hybride
SYMMES - SYstèmes Moléculaires et nanoMatériaux pour l’Energie et la Santé : DRF/INAC/SYMMES
Abstract : The current trend towards miniaturized and autonomous electronic devices requires innovative energy storage solutions. For instance, autonomous micro-sensor networks or implantable medical devices would need a robust power source with high cyclability and a large power density, which might be out of the scope of conventional battery technologies. For such applications, microsupercapacitors ($\mu$SCs) are promising alternatives, and their integration "on-chip" could allow significant innovations. However, finding a suitable "on-chip" $\mu$SCs technology implies addressing key challenges, such as temperature resistance, silicon industry compatibility and good electrochemical performances on a small footprint. Nanostructures such as SiNWs and SiNTrs demonstrated excellent cyclability with more than 1 million cycles of galvanostatic charge/discharge under a 4 V wide electrochemical windows in EMI-TFSI ionic liquid, with large power densities and good capacitance values. Moreover, the use of silicon for electrode material allows extremely interesting developments towards ?on-chip? integration and potential scale-up production using standard silicon industry processes for small micro-sized energy storage devices. Furthermore, we have also investigated the impact of the addition of a high-k dielectric layer, such as Al$_2$O$_3$ as protective films on silicon nanotrees. The electrochemical performances was enhanced, allowing symmetric 2 electrodes device to reach an unprecedented cell voltage of 5.5 V, improving energy and maximum power densities compared to unmodified nanostructured silicon. The cyclability was also largely enhanced, with only 3% capacitance fade after 1 million galvanostatic charge/discharge cycles at 4 V, and no degradation even after several 100000 cycles over 5 V.-Abstract Type : Invited
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https://hal-cea.archives-ouvertes.fr/cea-01993979
Contributor : Pascal Gentile <>
Submitted on : Friday, January 25, 2019 - 11:18:07 AM
Last modification on : Wednesday, October 14, 2020 - 4:05:23 AM
Long-term archiving on: : Friday, April 26, 2019 - 12:53:16 PM

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P. Gentile, Anthony Valero, Dorian Gaboriau, Maxime Boniface, Dmitry Aldakov, et al.. ALD Alumina Passivated Silicon Nanotrees electrodes for Ultrastable Microsupercapacitors. 2017 E-MRS Fall Meeting, Sep 2017, Varsovie, Poland. ⟨cea-01993979⟩

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