Structure and Conductivity of Crosslinked Ca‐POE Polymer Electrolytes for Secondary Batteries

Autor: Dr. Federico Brombin, Dr. Gioele Pagot, Prof. Keti Vezzù, Dr. Raul San Roman, Prof. Cynthia Susana Martinez Cisneros, Dr. Nieves Ureña, Prof. Alejandro Varez, Prof. Jean‐Yves Sanchez, Prof. Vito Di Noto
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: ChemElectroChem, Vol 11, Iss 20, Pp n/a-n/a (2024)
Druh dokumentu: article
ISSN: 2196-0216
20240031
DOI: 10.1002/celc.202400315
Popis: Abstract Poly(oxyethylene) (POE) is frequently used as suitable component to prepare solid polymer electrolytes (SPEs), due to its: (i) ability to coordinate and dissociate doping salts; (ii) good mechanical properties; and (iii) high chemical and electrochemical stability. With the aim to obtain calcium secondary batteries, here we describe the preparation and studies of crosslinked Ca‐polycondensate (NPCY) electrolytes with formula NPCY/(CaTf2)x based on fragments of POE chains and CaTf2. The molecular weight of POE precursors is Y=400 and 1000 g ⋅ mol−1. The effect of POE molecular weight on the thermal, structural, and electrical properties of NPCY/(CaTf2)x is investigated revealing that in mesoscale this materials show: (i) two different nanodomains with polyether chains both “free” (not coordinating the cation) and involved in 4–4 coordination cages of Ca2+ metal ions; (ii) fα‐fast, fα‐cross and fα‐slow relaxation modes of polyether chains, detected by broadband electrical spectroscopy, which are coupled with the long‐range charge migration pathways of SPEs; (iii) that triflate (Tf−) anions, which act as plasticizers, modulate the inter‐chain migration processes of Ca2+ between polyether coordination sites. Finally, the conductivity values of NPCY/(CaTf2)x, which is up to 10−4 S ⋅ cm−1 at 80 °C, classify NPCY/(CaTf2)x as promising SPEs for the development of calcium secondary batteries.
Databáze: Directory of Open Access Journals
Externí odkaz: