Conditions Extrêmes et Matériaux : Haute Température et Irradiation

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L.Artigues, M.Deschamps, F.Salles, L.Monconduit, V.Lapinte, V.Chaudoy, 'Towards N-rich solid polymer electrolytes for Li-ion batteries?', Mater. Adv. 4 5740-5752 (2023) doi:10.1039/d3ma00494e

Solid Polymer Electrolytes (SPEs) are faced to many specifications to replace the today liquid organic electrolyte in Li-ion batteries. In this paper, a polyethyleneimine-based (BPEI) is proposed as new SPE. Infrared and 13C NMR spectroscopies and DFT modelling were combined to clarify the ionic conduction mechanisms and performance in this new kind of polymer electrolyte. To improve its mechanical properties, the BPEI was semi-interpenetrated in a PEO based network. Afterwards to gather mechanical integrity and efficient ionic transport, inorganic fillers of different natures were added in membranes: Al2O3, SiO2, ZrO2 and LAGP. The addition of 10 wt% of SiO2 resulted for instance in an enhancement of ionic conductivity, reaching 2.2.10-4 S cm-1 at 80 °C. Furthermore, in symmetric cell, an improved cycling facing lithium metal, with stable response over hundreds of hours without polarization, regardless filler nature was observed.