Conditions Extrêmes et Matériaux : Haute Température et Irradiation

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V.Chaudoy, F.Pierre, A.Ghosh, M.Deschamps, F.Tran Van, F.Ghamouss, 'Rechargeable thin film flexible lithium microbattery using a quasi-solid-state polymer electrolyte', Batteries & Supercaps 4(8) 1351-1362 (2021) doi:10.1002/batt.202100041

A thin film microbattery was designed after synthesizing a unique gel polymer electrolyte (GPE), using PVdF-co-hexafluoropropylene (PVdF-HFP) and cross-linked POE. This composition resulted in a semi-interpenetrated network (Semi-IPN), which presented excellent host properties for the ionic liquid and salt mixture, and exhibited high ionic conductivity. This quasi-solid new electrolyte could be shaped as self-standing? thin films, and thus worked as both separator and electrolyte. Lithium ions of the electrolyte interact with the oxygens of the polymer chain, forming O-Li-O physical crosslinking points, and allowing us to balance between the lithium ion diffusion and the polymer matrix liquid retention capacity. The optimum composition of the polymers in the resultant electrolyte matrix exhibited excellent mechanical strength, which enabled compatibility of the electrolyte thin films with simple and industry friendly physical processes like thermal evaporation for lithium metal deposition on the top surface of the polymer. The fabricated device, where the Semi-IPN acts as both electrolyte and separator, provided an open circuit voltage of ~3.0 V and no short-circuit current was observed during its cycling. The Semi-IPN GPE based microbattery exhibits higher nominal voltage plateau, higher specific capacitance, and lower impedance by comparison to a conventional thin film microbattery designed with a popular ceramic electrolyte.