Correlation between Ionic Conductivity and Mechanical Properties of Solid-like PEO-based Polymer Electrolyte

Publication date : 11 Mar 2024
Authors : Agathe Naboulsi, Ronan Chometon, François Ribot, Giao Nguyen, Odile Fichet, and Christel Laberty-Robert
Published by : American Chemical Society

Poly(ethylene glycol) methyl ether methacrylate polymer networks (PEO-based networks), with or without anionic bis(trifluoromethanesulfonyl)imide (TFSI)-grafted groups, are promising electrolytes for Li–metal all solid-state batteries. Nevertheless, there is a need to enhance our current understanding of the physicochemical characteristics of these polymer networks to meet the mechanical and ionic conductivity property requirements for Li battery electrolyte materials. To address this challenge, our goal is to investigate the impact of the cross-linking density of the PEO-based network and the ethylene oxide/lithium ratio on mechanical properties (such as glass transition temperature and storage modulus) and ionic conductivity. We have synthesized a series of cross-linked PEO-based polymers (si-SPE for single ion solid polymer electrolyte) via solvent-free radical copolymerization. These polymers are synthesized by using commercially available lithium 3-[(trifluoromethane)sulfonamidosulfonyl]propyl methacrylate (LiMTFSI), poly(ethylene glycol)methyl ether methacrylate (PEGM), and [poly(ethylene glycol) dimethacrylate] (PEGDM). In addition, we have synthesized a series of cross-linked PEO-based polymers (SPE for solid polymer electrolyte) using LiTFSI as the ionic species. Most of the resulting polymer films are amorphous, self-standing, flexible, homogeneous, and thermally stable. Interestingly, our research has revealed a correlation between ionic conductivity and mechanical properties in both the SPE and si-SPE series. Ionic conductivity increases as glass transition temperature, α relaxation temperature, and storage modulus decrease, suggesting that Li+ transport is influenced by polymer chain flexibility and Li+/EO interaction.

DOI : 10.1021/acsami.3c19249

Related information


Last news

Do you have a business project?

The DIMs MaTerRE and QuanTiP join forces once again and organise a second residential school on entrepreneurship! The school will be held from June 12th to 14th [...]

From June 12th to 14th 2024

Afterwork Networking on Aqueous Batteries

A unique event dedicated to Ile-de-France aqueous batteries actors in a friendly setting! The DIM MaTerRE organises its very first “Aqueous Batteries” Afterwork Networking. This meeting aims [...]

May 23rd 2024 from 4 pm to 7 pm

Thesis offer – IMAP

IMAP is looking for a PhD student in materials chemistry to carry out the thesis “Structural analysis of stimuli responsive MOFs”, which aims to better understand the [...]