Evolution of the Ionic Conductivity of Solid Polymer Electrolytes upon Elongation - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2023

Evolution of the Ionic Conductivity of Solid Polymer Electrolytes upon Elongation

Résumé

Existing Li-ion battery technologies are limited for large scale application because of the presence of flammable liquid electrolytes (lithium salt in alkyl carbonate solvents).[1] Solid polymer electrolytes (SPEs) based on polyethylene oxide (PEO) directly address this issue but present a relatively low ionic conductivity (σ) at temperatures below the melting point (Tm) of about 55 °C with value typically lower than 10-5 S.cm-1. Strategies to increase the ionic conductivity of SPEs are typically based on the development of new polymer architectures, lithium salt natures, plasticizers, or additives. In addition, applying an external field such as magnetic, electric, pressure, or a mechanical deformation onto the SPEs can alter the resulting ionic transport properties.[2] For the later one, the main difficulty lies in obtaining the instantaneous evolution of the ionic conductivity coupled with the mechanical deformation and its geometrical change, especially when a striction domain appears. Inspired by the pioneered work of Golodnisky and Peled [3, 4] to study SPE elongation under uniaxial stress, a dedicated sample environment was designed to perform tensile tests in an inert atmosphere on SPE membranes at given temperatures, typically below and above the PEO melting temperature. Moreover, a methodology to calculate the instantaneous in-plane ionic conductivity is proposed based on COMSOL simulations to back out the sample geometrical changes during elongation. A strong impact on the in-plane ionic conductivity is observed when comparing PEO electrolyte architectures; from homopolymers to single-ion conducting block copolymer via binary conducting block copolymer electrolytes. Below the PEO melting temperature, a striction domain appears upon elongation whose conductivity is higher than the one of the bulk by a factor that depends on the SPE architecture. References: [1]F. Gebert, M. Longhini, F. Conti, A. J. Naylor, J. Power Sources 556 (2023) 232412. [2] M. J. Park, N. P. Balsara, Macromolecules 43 (2010) 292–298. [3]D. Golodnitsky, E. Peled, Electrochim. Acta 45 (2000) 1431–1436. [4]S. H. Chung, Y. Wang, S. .G Greenbaum, D. Golodnitsky, E. Peled, Electrochem. Solid-State Lett. 2 (1999) 553–555.

Domaines

Matériaux
Fichier non déposé

Dates et versions

hal-04580476 , version 1 (20-05-2024)

Identifiants

  • HAL Id : hal-04580476 , version 1

Citer

Roselyne Jeanne-Brou, Nicolas Charvin, Gilles De Moor, Lionel Flandin, Sébastien Issa, et al.. Evolution of the Ionic Conductivity of Solid Polymer Electrolytes upon Elongation. ESPE23 - European Symposium & Workshop on Polymer Electrolytes for Battery Applications, Sep 2023, Karlsruhe, Germany. ⟨hal-04580476⟩
0 Consultations
0 Téléchargements

Partager

Gmail Mastodon Facebook X LinkedIn More