High-performance all-solid-state cells fabricated with silicon electrodes
LE CRAS, Frédéric
Laboratoire d'Innovation pour les Technologies des Energies Nouvelles et les nanomatériaux [LITEN]
Laboratoire d'Innovation pour les Technologies des Energies Nouvelles et les nanomatériaux [LITEN]
LE CRAS, Frédéric
Laboratoire d'Innovation pour les Technologies des Energies Nouvelles et les nanomatériaux [LITEN]
< Réduire
Laboratoire d'Innovation pour les Technologies des Energies Nouvelles et les nanomatériaux [LITEN]
Langue
en
Article de revue
Ce document a été publié dans
Advanced Functional Materials. 2012, vol. 22, n° 12, p. 2580-2584
Wiley
Résumé en anglais
All solid-state thin-film lithium microbatteries are a promising component able to fulfill most of the specific requirements to power autonomous microsystems. Nevertheless, metallic lithium, which is commonly used as the ...Lire la suite >
All solid-state thin-film lithium microbatteries are a promising component able to fulfill most of the specific requirements to power autonomous microsystems. Nevertheless, metallic lithium, which is commonly used as the negative electrode in microbatteries, has a very low melting temperature (Tm = 181 °C) that appears to be incompatible with the solder-reflow operation (maximum temperature Tmax ≈ 260 °C) usually used to connect electronic components. Silicon is a promising candidate to replace lithium in solder-reflowable lithium-ion cells due to its high volumetric capacity (834 μAh cm−2 μm−1 for Li15Si4) and its ability to reversibly insert lithium at a low potential. Nevertheless, it suffers from a large volumetric expansion during lithium insertion (280%), which is partly responsible for a rapid capacity fading when cycled in liquid electrolyte. In this study, all-solid-state Li/LiPONB/Si cells are prepared using physical vapor deposition (PVD) techniques. The cycle life and the coulombic efficiency are found to be excellent in these solid-state cells with almost no loss during 1500 cycles. Despite the large volume expansion due to lithium insertion confirmed by scanning electron microscopy, no evidence of cracks is found in the film or at the electrode/electrolyte interface, even after 1500 cycles.< Réduire
Mots clés en anglais
Thin films
Silicon
Lithium batteries
Microbatteries
Origine
Importé de halUnités de recherche