Communication Dans Un Congrès Année : 2026

Development of nanoporous polymer electrolytes for lithium metal batteries

Développement d'électrolytes polymères nanoporeux pour les batteries au lithium métal

Résumé

Separators used in lithium batteries (LiBs) physically separate the electrodes to prevent short circuits, while allowing lithium ions (Li+) to move freely through the pores of the separators. As a critical component of LiBs, separators directly impact battery performance. Macroporous polyolefin-based membranes have been widely used as separators in LiBs due to their mechanical strength and adequate electrochemical stability. However, these separators suffer from inherent limitations, such as poor wettability, low liquid electrolyte loading as well as low thermal stability. Poor electrolytes wettability and absorption hinder Li+ transport, degrading battery performance during charge and discharge cycles. In addition, the low thermal stability of polyolefin separators increases the risk of internal short circuits at high temperatures, raising significant safety concerns1. On the other hand, confining liquid electrolytes or poly(ethhylene oxide)/Li salt electrolytes within nanoporous membranes enhanced both ionic conductivity and cycling performance2,3. However, the pore wall chemistry and the pores density of the reported nanoporous membranes cannot be easily modulated. In the present work, we propose an innovative approach based on the self-assembly of block copolymers (BCPs) to fabricate porous polymer electrolyte membranes with oriented nanometric cylindrical pores perpendicular to the electrodes. This approach provides a versatile platform for tailoring the size and geometry of nanopores at large-scale as well as enabling selective functionalization of voided channels. The BCPs used in this work consist of a sacrificial block – polyethylene oxide (PEO) – and a matrix block, that is a random copolymer of styrene and isoprene: poly(styrene-r-isoprene) (PSI) (Fig. 1A). These BCPs were synthesized via nitroxide-mediated polymerization to achieve low dispersity (Ð<1.3). The pore size was directly controlled by the length of the PEO block (ranging from 5 to 20 kg/mol), while the mechanical properties of the membranes were conferred by the cross-linked PSI matrix. Thin films, approximatively tens of micrometers thick, exhibited excellent nanostructuration in various morphologies depending on the BCP composition (Fig. 1B-C). The PEO block was subsequently removed from the UV-cross-linked films via acid hydrolysis, resulting in nanoporous membranes. Extensive chemical and physical characterization were performed using a combination of techniques (AFM, SEM, SAXS ,SANS,…) to fully characterize our membranes, both empty and filled with non-flammable liquid electrolytes. This communication will feature on synthesis, self-assembly and characterization of our BCPs. Bibliography : (1) Adv. Sci. 2021, 8 (7), 2003096. https://doi.org/10.1002/advs.202003096. (2) Energy Storage Mater. 2025, 75,104045.https://doi.org/10.1016/j.ensm.2025.104045. (3) Batteries. Nat. Nanotechnol. 2019, 14 (7), 705–711. https://doi.org/10.1038/s41565-019-0465-3.

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hal-05556310 , version 1 (17-03-2026)

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A Zagoury, A-A Ka, K Aissou, J-M Zanotti, D Gigmes, et al.. Development of nanoporous polymer electrolytes for lithium metal batteries. 19èmes Journées Scientifiques de la section Méditerranée du Groupe Français des Polymères, Groupe Français des Polymères, May 2026, Toulon, France. ⟨hal-05556310v1⟩
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